Pub Date : 2005-10-17DOI: 10.1109/MILCOM.2005.1605786
B.R. Wiederholt, M. Blanco
In military satellite communication systems that use frequency hopped waveforms, it is difficult to coherently detect phase shift keying (PSK) (binary or M-ary) signals unless many reference symbols are used to aid with phase estimation of the received signal. For this reason, many systems use differential phase modulations, such as differential phase shift keying (DPSK), which can be detected noncoherently without the use of phase information. However, the use of DPSK over PSK results in reduced power efficiency. This paper presents a novel approach to phase estimation that provides improved power efficiency through coherent detection of phase modulated signals (with and without differential encoding) using few reference symbols. More specifically, the algorithm presented herein uses signal processing techniques to estimate the phase of each hop by using both reference and information symbols in a hop. This paper focuses on binary PSK and DPSK waveforms where data is transmitted in blocks with only one or two reference symbols per block. The performance of this algorithm was evaluated for the case of additive white Gaussian noise (AWGN) and Rayleigh fading channels via Monte Carlo simulations. At bit error rates (BER) of interest, the results indicate that, depending on the environment and modulation used, performance gains of up to 3 dB were realized when hops contain as few as two reference symbols. The results also show that coherent detection of binary phase shifting keying (BPSK) and DPSK modulated waveforms containing one reference symbol per hop performed more efficiently than noncoherent detection in all channels considered
{"title":"Phase estimation algorithm for frequency hopped binary PSK and DPSK waveforms with small number of reference symbols","authors":"B.R. Wiederholt, M. Blanco","doi":"10.1109/MILCOM.2005.1605786","DOIUrl":"https://doi.org/10.1109/MILCOM.2005.1605786","url":null,"abstract":"In military satellite communication systems that use frequency hopped waveforms, it is difficult to coherently detect phase shift keying (PSK) (binary or M-ary) signals unless many reference symbols are used to aid with phase estimation of the received signal. For this reason, many systems use differential phase modulations, such as differential phase shift keying (DPSK), which can be detected noncoherently without the use of phase information. However, the use of DPSK over PSK results in reduced power efficiency. This paper presents a novel approach to phase estimation that provides improved power efficiency through coherent detection of phase modulated signals (with and without differential encoding) using few reference symbols. More specifically, the algorithm presented herein uses signal processing techniques to estimate the phase of each hop by using both reference and information symbols in a hop. This paper focuses on binary PSK and DPSK waveforms where data is transmitted in blocks with only one or two reference symbols per block. The performance of this algorithm was evaluated for the case of additive white Gaussian noise (AWGN) and Rayleigh fading channels via Monte Carlo simulations. At bit error rates (BER) of interest, the results indicate that, depending on the environment and modulation used, performance gains of up to 3 dB were realized when hops contain as few as two reference symbols. The results also show that coherent detection of binary phase shifting keying (BPSK) and DPSK modulated waveforms containing one reference symbol per hop performed more efficiently than noncoherent detection in all channels considered","PeriodicalId":223742,"journal":{"name":"MILCOM 2005 - 2005 IEEE Military Communications Conference","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128359974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-10-17DOI: 10.1109/MILCOM.2005.1605936
A. Niktash, R. Maestre, N. Bagherzadeh
In this paper we present Morpho Technologies' reconfigurable MS2 platform for handling key baseband processing of PHY layer OFDM kernels that are commonly implemented in ASIC structures for commercial standards such as 802.11a, 802.16 (WiMax) and military waveforms such as WNW. First, we present an overview of Morpho's MS2 platform architecture. MS2 is a highly optimized and efficient parallel processing solution designed to meet both the real-time baseband processing and ultra low power requirements for mobile solutions. Next, we describe the detailed implementation of the most computationally intensive kernels that constitute the critical components of OFDM. The flexibility of the MS2 solution empowers SoC designers to not only meet the current OFDM PHY layer requirements, but to create a platform that can accommodate future changes within these standards. From the military wireless communications point of view, having an efficient and low power OFDM solution is critical to support the JTRS programs for the next decade, Morpho's MS2 solution provides SoC designers with an avenue to solve this difficult problem
{"title":"A case study of performing OFDM kernels on a novel reconfigurable DSP architecture","authors":"A. Niktash, R. Maestre, N. Bagherzadeh","doi":"10.1109/MILCOM.2005.1605936","DOIUrl":"https://doi.org/10.1109/MILCOM.2005.1605936","url":null,"abstract":"In this paper we present Morpho Technologies' reconfigurable MS2 platform for handling key baseband processing of PHY layer OFDM kernels that are commonly implemented in ASIC structures for commercial standards such as 802.11a, 802.16 (WiMax) and military waveforms such as WNW. First, we present an overview of Morpho's MS2 platform architecture. MS2 is a highly optimized and efficient parallel processing solution designed to meet both the real-time baseband processing and ultra low power requirements for mobile solutions. Next, we describe the detailed implementation of the most computationally intensive kernels that constitute the critical components of OFDM. The flexibility of the MS2 solution empowers SoC designers to not only meet the current OFDM PHY layer requirements, but to create a platform that can accommodate future changes within these standards. From the military wireless communications point of view, having an efficient and low power OFDM solution is critical to support the JTRS programs for the next decade, Morpho's MS2 solution provides SoC designers with an avenue to solve this difficult problem","PeriodicalId":223742,"journal":{"name":"MILCOM 2005 - 2005 IEEE Military Communications Conference","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128504868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-10-17DOI: 10.1109/MILCOM.2005.1606018
G. Case, S. Modelfino
High speed connectivity provides C4I and enables small unit rapid deployment at a unit of action (UA) level. This new operating paradigm will require a shift in the way the DoD plans, provisions and operates satellite links. Currently most satellite links are designed for worst case, or near worst case, operating conditions with the modulation and coding chosen to insure link closure between 97% and 99.5% of the time. This results in a substantial waste of link margin and a loss of spectral efficiency since that margin is seldom required. Dynamic coding and modulation (DCM) has been used in commercial networks to improve spectral efficiency and increase the number of users that can be supported with limited spectrum. DCM achieves this performance by adaptively changing modulation, coding and channel rate as environmental and link conditions changes. This allows RF links to operate with much smaller margins than is possible given static link operations. This paper evaluates the effectiveness of DCM for the MILSATCOM architecture. The authors describe a statistical link simulation model for estimating the advantage of DCM. The model was used to analyze the spectral requirements for a major theater of war containing over 1500 terminals. The paper analyzes a Korean theater scenario consisting of 7 FCS units of action (UA) and 6 BCT brigades as well as six UEx units and one UEy unit. The analysis was performed for a regenerative TSAT-like SATCOM architecture using advanced modulation. The paper compares static link operation to DCM operation and estimates gain in terms of spectral efficiency and transmit/receive burst rate. The results are presented as a function of link margin for a number of deployable army terminal classes, and as a theater aggregate. For the COTM terminal class, the results show that overall theater uplink spectral efficiency gains of 1.5x to 2x, and average burst rate increase of 2x to 4x are possible in high rain rate regions using DCM versus traditional planning and provisioning approaches.
{"title":"Statistical analysis of dynamic coding and modulation theater level gains","authors":"G. Case, S. Modelfino","doi":"10.1109/MILCOM.2005.1606018","DOIUrl":"https://doi.org/10.1109/MILCOM.2005.1606018","url":null,"abstract":"High speed connectivity provides C4I and enables small unit rapid deployment at a unit of action (UA) level. This new operating paradigm will require a shift in the way the DoD plans, provisions and operates satellite links. Currently most satellite links are designed for worst case, or near worst case, operating conditions with the modulation and coding chosen to insure link closure between 97% and 99.5% of the time. This results in a substantial waste of link margin and a loss of spectral efficiency since that margin is seldom required. Dynamic coding and modulation (DCM) has been used in commercial networks to improve spectral efficiency and increase the number of users that can be supported with limited spectrum. DCM achieves this performance by adaptively changing modulation, coding and channel rate as environmental and link conditions changes. This allows RF links to operate with much smaller margins than is possible given static link operations. This paper evaluates the effectiveness of DCM for the MILSATCOM architecture. The authors describe a statistical link simulation model for estimating the advantage of DCM. The model was used to analyze the spectral requirements for a major theater of war containing over 1500 terminals. The paper analyzes a Korean theater scenario consisting of 7 FCS units of action (UA) and 6 BCT brigades as well as six UEx units and one UEy unit. The analysis was performed for a regenerative TSAT-like SATCOM architecture using advanced modulation. The paper compares static link operation to DCM operation and estimates gain in terms of spectral efficiency and transmit/receive burst rate. The results are presented as a function of link margin for a number of deployable army terminal classes, and as a theater aggregate. For the COTM terminal class, the results show that overall theater uplink spectral efficiency gains of 1.5x to 2x, and average burst rate increase of 2x to 4x are possible in high rain rate regions using DCM versus traditional planning and provisioning approaches.","PeriodicalId":223742,"journal":{"name":"MILCOM 2005 - 2005 IEEE Military Communications Conference","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129574015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-10-17DOI: 10.1109/MILCOM.2005.1606057
S. A. Shah
The defense information system network (DISN) in the global information grid (GIG) is the premier DoD global information transport backbone network. It consists of NIPRNET, SIPRNET, DSN, and DRSN, which are the major networks to provide long haul imagery, voice, video, and data transport networking services. The terrestrial-based DISN has been working with teleport and global broadcast services (GBS) to deliver classified and unclassified video, imagery, and other information products in support of e-collaboration among DISN, teleport, and GBS worldwide joint military operations. This has greatly enhanced the mobility theater-deployed warfighters and significantly contributed to the successful execution of various contingency operations. Despite these advances, important challenges remain to extend DISN broadband communications capabilities and real-time IP-based services to the disadvantaged deployed mobile end users who are on the forefront in very constrained environment. The proposed architecture framework presented in this paper, bridges the communication capacity gaps and provides critical transport capabilities that will transform future battlefield communications. A comprehensive test and assessment effort is underway to ensure the seamless, end-to-end integration of wireless services with the GIG assets for delivering C4ISR information to the edge. When deployed, the WSDN will be able to extend DISN services to fixed and/or mobile installations in theater. It will provide additional interoperable capability to joint tactical radio system (JTRS) and enhanced mobility for the warfighter information network-tactical (WIN-T) users
{"title":"DISN advanced wireless mobile services (DAWMS) in global net-centric environment for the warfighter","authors":"S. A. Shah","doi":"10.1109/MILCOM.2005.1606057","DOIUrl":"https://doi.org/10.1109/MILCOM.2005.1606057","url":null,"abstract":"The defense information system network (DISN) in the global information grid (GIG) is the premier DoD global information transport backbone network. It consists of NIPRNET, SIPRNET, DSN, and DRSN, which are the major networks to provide long haul imagery, voice, video, and data transport networking services. The terrestrial-based DISN has been working with teleport and global broadcast services (GBS) to deliver classified and unclassified video, imagery, and other information products in support of e-collaboration among DISN, teleport, and GBS worldwide joint military operations. This has greatly enhanced the mobility theater-deployed warfighters and significantly contributed to the successful execution of various contingency operations. Despite these advances, important challenges remain to extend DISN broadband communications capabilities and real-time IP-based services to the disadvantaged deployed mobile end users who are on the forefront in very constrained environment. The proposed architecture framework presented in this paper, bridges the communication capacity gaps and provides critical transport capabilities that will transform future battlefield communications. A comprehensive test and assessment effort is underway to ensure the seamless, end-to-end integration of wireless services with the GIG assets for delivering C4ISR information to the edge. When deployed, the WSDN will be able to extend DISN services to fixed and/or mobile installations in theater. It will provide additional interoperable capability to joint tactical radio system (JTRS) and enhanced mobility for the warfighter information network-tactical (WIN-T) users","PeriodicalId":223742,"journal":{"name":"MILCOM 2005 - 2005 IEEE Military Communications Conference","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129115621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-10-17DOI: 10.1109/MILCOM.2005.1606024
M. Acriche, C. Holsinger, A. Staikos, J. Dimarogonas, R. Sonalkar
This paper describes a new research and development program called multi-dimensional, assured, robust communications for an on-the-move network (MARCON-i) that recently began at Communications-Electronics Research Development and Engineering Center (CERDEC), Ft. Monmouth NJ. The MARCON-i effort focused on the development and integration of two complementary networking technologies needed to achieve increased bandwidth and greater connectivity on the battlefield: proactive diverse link selection (PAD-LS) and directional networking technologies (DNT). The first technology area, PAD-LS, was being developed to enable automatic link selection over multiple, widely varying transmission paths to bypass congestion and/or outages. This is an important element needed to enhance both communications survivability and network capacity. DNT was envisioned to integrate advanced directional networking technologies to provide additional capacity, anti jam/low probability of intercept (AJ/LPI), and network robustness. The program began in FY 2005 and was scheduled to run through FY 2009. Based on shifts in research and development priorities, the MARCON-i program was refocused to concentrate on the challenge of limited network reliability resulting from the inability to make optimal use of all available link types, simultaneously. The resulting program will look to leverage the PAD-LS technologies investigated under the MARCON-i program. This new program is currently entitled the proactive integrated link selection for network robustness (PILSNER) army technology objective (demonstration) (ATO(D)) program and is scheduled to run from FY 2006 through FY 2009.
{"title":"Multi-dimensional, assured, robust communications for an on-the-move network (MARCON-i)","authors":"M. Acriche, C. Holsinger, A. Staikos, J. Dimarogonas, R. Sonalkar","doi":"10.1109/MILCOM.2005.1606024","DOIUrl":"https://doi.org/10.1109/MILCOM.2005.1606024","url":null,"abstract":"This paper describes a new research and development program called multi-dimensional, assured, robust communications for an on-the-move network (MARCON-i) that recently began at Communications-Electronics Research Development and Engineering Center (CERDEC), Ft. Monmouth NJ. The MARCON-i effort focused on the development and integration of two complementary networking technologies needed to achieve increased bandwidth and greater connectivity on the battlefield: proactive diverse link selection (PAD-LS) and directional networking technologies (DNT). The first technology area, PAD-LS, was being developed to enable automatic link selection over multiple, widely varying transmission paths to bypass congestion and/or outages. This is an important element needed to enhance both communications survivability and network capacity. DNT was envisioned to integrate advanced directional networking technologies to provide additional capacity, anti jam/low probability of intercept (AJ/LPI), and network robustness. The program began in FY 2005 and was scheduled to run through FY 2009. Based on shifts in research and development priorities, the MARCON-i program was refocused to concentrate on the challenge of limited network reliability resulting from the inability to make optimal use of all available link types, simultaneously. The resulting program will look to leverage the PAD-LS technologies investigated under the MARCON-i program. This new program is currently entitled the proactive integrated link selection for network robustness (PILSNER) army technology objective (demonstration) (ATO(D)) program and is scheduled to run from FY 2006 through FY 2009.","PeriodicalId":223742,"journal":{"name":"MILCOM 2005 - 2005 IEEE Military Communications Conference","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130587570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-10-17DOI: 10.1109/MILCOM.2005.1605928
Wei-Peng Chen, J. Hou, L. Sha, M. Caccamo
Distinct from wireless ad hoc networks, wireless sensor networks are data-centric, application-oriented, collaborative, and energy-constrained in nature. In this paper, we formulate the problem of data transport in sensor networks as an optimization problem, with the objective of maximizing the amount of information (utility) collected at sinks, subject to both the channel bandwidth and energy constraints. We then devise a distributed solution of the convex optimization problem, and explore in three directions. First, we devise a simple node capacity estimation method to on-line measure the node capacity. Second, we linearize the energy constraint by properly setting the value of the system lifetime in advance and controlling the data rate of a node so as to sustain its battery lifetime longer than the specified lifetime. Finally, we incorporate the optimization results into routing so as to provide sensors with opportunities to select better routes. The simulation results show that the utility-based approach balances between system utility and system lifetime
{"title":"A distributer, energy-aware, utility-based approach for data transport in wireless sensor networks","authors":"Wei-Peng Chen, J. Hou, L. Sha, M. Caccamo","doi":"10.1109/MILCOM.2005.1605928","DOIUrl":"https://doi.org/10.1109/MILCOM.2005.1605928","url":null,"abstract":"Distinct from wireless ad hoc networks, wireless sensor networks are data-centric, application-oriented, collaborative, and energy-constrained in nature. In this paper, we formulate the problem of data transport in sensor networks as an optimization problem, with the objective of maximizing the amount of information (utility) collected at sinks, subject to both the channel bandwidth and energy constraints. We then devise a distributed solution of the convex optimization problem, and explore in three directions. First, we devise a simple node capacity estimation method to on-line measure the node capacity. Second, we linearize the energy constraint by properly setting the value of the system lifetime in advance and controlling the data rate of a node so as to sustain its battery lifetime longer than the specified lifetime. Finally, we incorporate the optimization results into routing so as to provide sensors with opportunities to select better routes. The simulation results show that the utility-based approach balances between system utility and system lifetime","PeriodicalId":223742,"journal":{"name":"MILCOM 2005 - 2005 IEEE Military Communications Conference","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132503765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-10-17DOI: 10.1109/MILCOM.2005.1606021
H. Feil, W. Metler
With the communication evolution to the all Internet protocol (IP) architecture to support tactical environments using joint tactical radio system (JTRS), significant new IP routing challenges exist. Mobile ad-hoc networking (MANET) has been in development for many years now, however, existing MANET protocols have not been designed to scale to the size or proportions of the transformation communication architecture (TCA) vision. This paper describes a potential IPv6 addressing and routing architecture vision for tactical users in a notional TCA era where satellite and aircraft routing gateways exist. The paper also identifies routing protocol deficiencies that exist in current and planned MANET and traditional routing protocols.
{"title":"Mobile routing architectures in the transformational communication era","authors":"H. Feil, W. Metler","doi":"10.1109/MILCOM.2005.1606021","DOIUrl":"https://doi.org/10.1109/MILCOM.2005.1606021","url":null,"abstract":"With the communication evolution to the all Internet protocol (IP) architecture to support tactical environments using joint tactical radio system (JTRS), significant new IP routing challenges exist. Mobile ad-hoc networking (MANET) has been in development for many years now, however, existing MANET protocols have not been designed to scale to the size or proportions of the transformation communication architecture (TCA) vision. This paper describes a potential IPv6 addressing and routing architecture vision for tactical users in a notional TCA era where satellite and aircraft routing gateways exist. The paper also identifies routing protocol deficiencies that exist in current and planned MANET and traditional routing protocols.","PeriodicalId":223742,"journal":{"name":"MILCOM 2005 - 2005 IEEE Military Communications Conference","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130402845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-10-17DOI: 10.1109/MILCOM.2005.1605757
J. Morrow, J. Laub
The development of the concepts for the global information grid and for Net-Centric Warfare systems identify the need for more dynamic and configurable means to enable and control authenticity, access, privileges, interconnections not only in the networked environment, but also in the mission environment. Policy-based mechanisms have been identified as the primary means to achieve this flexibility. This paper examines what "policy" is, what operational benefits can be achieved by utilizing policy-based mechanisms, and how policy can be utilized to control the following in a coherent and integrated manner: communications, networking, security, data and services, workstations, mission subsystems, and entire mission systems. Special emphasis will be given in the paper to communications, networking, security, data and services. The paper also examines the "policy management infrastructure" that is needed to manage the lifecycle of policies throughout the entire system and its communications and networks
{"title":"Dynamic policy enablement and management in net-centric warfare systems and communications","authors":"J. Morrow, J. Laub","doi":"10.1109/MILCOM.2005.1605757","DOIUrl":"https://doi.org/10.1109/MILCOM.2005.1605757","url":null,"abstract":"The development of the concepts for the global information grid and for Net-Centric Warfare systems identify the need for more dynamic and configurable means to enable and control authenticity, access, privileges, interconnections not only in the networked environment, but also in the mission environment. Policy-based mechanisms have been identified as the primary means to achieve this flexibility. This paper examines what \"policy\" is, what operational benefits can be achieved by utilizing policy-based mechanisms, and how policy can be utilized to control the following in a coherent and integrated manner: communications, networking, security, data and services, workstations, mission subsystems, and entire mission systems. Special emphasis will be given in the paper to communications, networking, security, data and services. The paper also examines the \"policy management infrastructure\" that is needed to manage the lifecycle of policies throughout the entire system and its communications and networks","PeriodicalId":223742,"journal":{"name":"MILCOM 2005 - 2005 IEEE Military Communications Conference","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127892333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-10-17DOI: 10.1109/MILCOM.2005.1605966
B. J. Wolf, J. Hammond, H. Russell
We present a method for maximizing the throughput of mobile ad hoc packet radio networks using broadcast transmission scheduling. In such networks, a terminal may become a bottleneck if it is not allocated enough transmission slots in the current transmission schedule to handle the traffic flowing through it. Topology induced bottlenecks may arise frequently in ad hoc networks due to uneven distributions of terminals. Terminals in sparse areas of a network may be required to forward a large amount of traffic to facilitate communication between dense areas of the network. We address this problem by modifying the broadcast transmission schedule so that terminals handling more traffic have more opportunities to transmit. First, we describe a theoretical framework for analyzing the performance of a given schedule in terms of end-to-end stable throughput; we also define the upper bound for this performance. Next, we introduce a centralized algorithm that uses a process similar to simulated annealing to generate schedules with near optimal performance. We conduct simulation studies to show that transmission schedules produced by the centralized algorithm offer greatly improved performance over a simple, collision-free transmission schedule in terms of end-to-end packet delay, throughput, and completion rate. These studies are performed on a variety of test networks to generalize results and demonstrate the wide applicability of these principles.
{"title":"Designing transmission schedules for wireless ad hoc networks to maximize network throughput","authors":"B. J. Wolf, J. Hammond, H. Russell","doi":"10.1109/MILCOM.2005.1605966","DOIUrl":"https://doi.org/10.1109/MILCOM.2005.1605966","url":null,"abstract":"We present a method for maximizing the throughput of mobile ad hoc packet radio networks using broadcast transmission scheduling. In such networks, a terminal may become a bottleneck if it is not allocated enough transmission slots in the current transmission schedule to handle the traffic flowing through it. Topology induced bottlenecks may arise frequently in ad hoc networks due to uneven distributions of terminals. Terminals in sparse areas of a network may be required to forward a large amount of traffic to facilitate communication between dense areas of the network. We address this problem by modifying the broadcast transmission schedule so that terminals handling more traffic have more opportunities to transmit. First, we describe a theoretical framework for analyzing the performance of a given schedule in terms of end-to-end stable throughput; we also define the upper bound for this performance. Next, we introduce a centralized algorithm that uses a process similar to simulated annealing to generate schedules with near optimal performance. We conduct simulation studies to show that transmission schedules produced by the centralized algorithm offer greatly improved performance over a simple, collision-free transmission schedule in terms of end-to-end packet delay, throughput, and completion rate. These studies are performed on a variety of test networks to generalize results and demonstrate the wide applicability of these principles.","PeriodicalId":223742,"journal":{"name":"MILCOM 2005 - 2005 IEEE Military Communications Conference","volume":"1983 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125455412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-10-17DOI: 10.1109/MILCOM.2005.1605806
Wei Cao, A. Nallanathan, B. Kannan, C. C. Chai
Bit error rate (BER) performance of various UWB systems has been analyzed in numerous literatures. Most of the BER evaluation in these publications is based on some approximations. In this paper, we propose a method based on characteristic function (CF) to derive exact BER of DS UWB systems using pulse position modulation (PPM) under imperfect power control. In contrast to the widely used Gaussian approximation (GA) method, CF method deals with the exact distribution of total noise (including multiple-access interference and AWGN noise) other than making any assumptions on the distribution of total noise. Therefore CF method offers much more accurate BER prediction than GA method does. Our analytical derivations are validated by simulation results
{"title":"Exact BER analysis of DS PPM UWB multiple access system under imperfect power control","authors":"Wei Cao, A. Nallanathan, B. Kannan, C. C. Chai","doi":"10.1109/MILCOM.2005.1605806","DOIUrl":"https://doi.org/10.1109/MILCOM.2005.1605806","url":null,"abstract":"Bit error rate (BER) performance of various UWB systems has been analyzed in numerous literatures. Most of the BER evaluation in these publications is based on some approximations. In this paper, we propose a method based on characteristic function (CF) to derive exact BER of DS UWB systems using pulse position modulation (PPM) under imperfect power control. In contrast to the widely used Gaussian approximation (GA) method, CF method deals with the exact distribution of total noise (including multiple-access interference and AWGN noise) other than making any assumptions on the distribution of total noise. Therefore CF method offers much more accurate BER prediction than GA method does. Our analytical derivations are validated by simulation results","PeriodicalId":223742,"journal":{"name":"MILCOM 2005 - 2005 IEEE Military Communications Conference","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126673370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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