Pub Date : 2009-04-05DOI: 10.1109/WCNC.2009.4917767
Xiaoguang Li, Changqiao Xu
The aggregate capacity of wireless mesh networks can be increased by the use of multiple channels. In this paper, we present the joint channel assignment implementation for Multiinterface and Multi-channel wireless network. To reap the full performance potential of this architecture, we propose and evaluate a combination of centralized and dynamic peer oriented distribution channel assignment, and enhanced AODV routing algorithms for Real Time multi-channel wireless mesh networks. Simulation results show that with joint channel assignment, equipping every wireless mesh network node with different interfaces operating on different channels can improve the total network performance and make the most of traffics by finding more routes with enhanced AODV.
{"title":"Joint Channel Assignment and Routing in Real Time Wireless Mesh Network","authors":"Xiaoguang Li, Changqiao Xu","doi":"10.1109/WCNC.2009.4917767","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917767","url":null,"abstract":"The aggregate capacity of wireless mesh networks can be increased by the use of multiple channels. In this paper, we present the joint channel assignment implementation for Multiinterface and Multi-channel wireless network. To reap the full performance potential of this architecture, we propose and evaluate a combination of centralized and dynamic peer oriented distribution channel assignment, and enhanced AODV routing algorithms for Real Time multi-channel wireless mesh networks. Simulation results show that with joint channel assignment, equipping every wireless mesh network node with different interfaces operating on different channels can improve the total network performance and make the most of traffics by finding more routes with enhanced AODV.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"289 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115534234","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917746
Z. Awan, S. B. Slimane
Multiple constellations has been proposed recently as a way of improving the system performance when used in conjunction with Orthogonal Transmit Diversity (OTD) for high level linear modulation schemes. This paper considers the use of multiple constellations in Multiple Input Multiple Output (MIMO) antenna systems. The premise is that the same modulation scheme is used with different bits to symbols mapping for each branch. This improved beamforming results in better performance as compared to MIMO-MRC where the same bits to symbols mapping is used on all branches. Analytical expression for Symbol Error Probability (SEP) is derived. The results obtained show that the new proposed improved beamforming scheme outperforms conventional MIMO-MRC with a performance dividend that increases with the linear modulation level.
{"title":"Improved Beamforming for Radio Links with Multi-Level Linearly Modulated Signals","authors":"Z. Awan, S. B. Slimane","doi":"10.1109/WCNC.2009.4917746","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917746","url":null,"abstract":"Multiple constellations has been proposed recently as a way of improving the system performance when used in conjunction with Orthogonal Transmit Diversity (OTD) for high level linear modulation schemes. This paper considers the use of multiple constellations in Multiple Input Multiple Output (MIMO) antenna systems. The premise is that the same modulation scheme is used with different bits to symbols mapping for each branch. This improved beamforming results in better performance as compared to MIMO-MRC where the same bits to symbols mapping is used on all branches. Analytical expression for Symbol Error Probability (SEP) is derived. The results obtained show that the new proposed improved beamforming scheme outperforms conventional MIMO-MRC with a performance dividend that increases with the linear modulation level.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116104956","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4918009
Piming Ma, K. Kwak
In this paper, we propose a scheme to design unequal error protection low-density parity-check (UEP-LDPC) codes based on Gaussian approximation algorithm over AWGN channel. Using this method, we can find effective UEP-LDPC code ensemble which has good overall performance and good UEP property. Simulation results show the superiority of the proposed UEP-LDPC code in improving the quality of reconstructed image in uncompressed image and set partitioning into hierarchical trees (SPIHT) coded image transmission.
{"title":"Unequal Error Protection Low-Density Parity-Check Codes Design Based on Gaussian Approximation in Image Transmission","authors":"Piming Ma, K. Kwak","doi":"10.1109/WCNC.2009.4918009","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4918009","url":null,"abstract":"In this paper, we propose a scheme to design unequal error protection low-density parity-check (UEP-LDPC) codes based on Gaussian approximation algorithm over AWGN channel. Using this method, we can find effective UEP-LDPC code ensemble which has good overall performance and good UEP property. Simulation results show the superiority of the proposed UEP-LDPC code in improving the quality of reconstructed image in uncompressed image and set partitioning into hierarchical trees (SPIHT) coded image transmission.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122815167","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917756
L. Nagy
Recently there is a growing interest in providing and improving radio coverage for mobile phones and WLANs inside buildings. The need of such coverage appears mainly in office buildings, shopping malls, train stations where the subscriber density is very high. The cost of cellular systems and also the one of indoor wireless systems depend highly on the number of base stations required to achieve the desired coverage for a given level of field strength. This paper presents an approach in optimizing the indoor radio coverage using multiple access points for indoor environments. The Genetic Algorithm (GA) and Simulated Annealing (SA) are used to determine the optimal access point positions to achieve optimum coverage. Next a hierarchic optimization method is introduced and finally comparisons are made for the methods suggested.
{"title":"Indoor Radio Network Optimization Using Multi Level Hierarchic Method","authors":"L. Nagy","doi":"10.1109/WCNC.2009.4917756","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917756","url":null,"abstract":"Recently there is a growing interest in providing and improving radio coverage for mobile phones and WLANs inside buildings. The need of such coverage appears mainly in office buildings, shopping malls, train stations where the subscriber density is very high. The cost of cellular systems and also the one of indoor wireless systems depend highly on the number of base stations required to achieve the desired coverage for a given level of field strength. \u0000 \u0000This paper presents an approach in optimizing the indoor radio coverage using multiple access points for indoor environments. The Genetic Algorithm (GA) and Simulated Annealing (SA) are used to determine the optimal access point positions to achieve optimum coverage. \u0000 \u0000Next a hierarchic optimization method is introduced and finally comparisons are made for the methods suggested.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114257382","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917525
Zhijin Wu, Xue Li, R. Husnay, V. Chakravarthy, Bin Wang, Zhiqiang Wu
Sums of lognormal random variables occur in many important problems in wireless communications. However, the lognormal sum distribution is known to have no close-form and is difficult to compute numerically. Several approximation methods have already been proposed to approximate the lognormal sum distribution. However, these approximation methods all have their drawbacks: some widely used approximation methods are not very accurate at the lower region, some other approximation methods require the CDF curve from Monte Carlo simulation first. In this paper, we propose a novel approximation method, namely the Log Skew Normal (LSN) approximation, to model and approximate the sum of M lognormal distributed random variables. The proposed LSN approximation method has very high accuracy in most of the region, especially in the lower region. Furthermore, this approximation method does not require the CDF curve from Monte Carlo simulation first. The closed-form probability density function (PDF) of the resulting LSN random variable is presented and its parameters are derived from those of the M individual lognormal random variables by using an moment matching technique. Simulation results on the cumulative distribution function (CDF) of sum of M lognormal random variables in different conditions are used as reference curves to compare various approximation techniques. LSN approximation is found to provide better accuracy over a wide CDF range over other approximation methods.
{"title":"A Novel Highly Accurate Log Skew Normal Approximation Method to Lognormal Sum Distributions","authors":"Zhijin Wu, Xue Li, R. Husnay, V. Chakravarthy, Bin Wang, Zhiqiang Wu","doi":"10.1109/WCNC.2009.4917525","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917525","url":null,"abstract":"Sums of lognormal random variables occur in many important problems in wireless communications. However, the lognormal sum distribution is known to have no close-form and is difficult to compute numerically. Several approximation methods have already been proposed to approximate the lognormal sum distribution. However, these approximation methods all have their drawbacks: some widely used approximation methods are not very accurate at the lower region, some other approximation methods require the CDF curve from Monte Carlo simulation first. In this paper, we propose a novel approximation method, namely the Log Skew Normal (LSN) approximation, to model and approximate the sum of M lognormal distributed random variables. The proposed LSN approximation method has very high accuracy in most of the region, especially in the lower region. Furthermore, this approximation method does not require the CDF curve from Monte Carlo simulation first. The closed-form probability density function (PDF) of the resulting LSN random variable is presented and its parameters are derived from those of the M individual lognormal random variables by using an moment matching technique. Simulation results on the cumulative distribution function (CDF) of sum of M lognormal random variables in different conditions are used as reference curves to compare various approximation techniques. LSN approximation is found to provide better accuracy over a wide CDF range over other approximation methods.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114452366","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917941
I. Krikidis, J. Thompson, S. McLaughlin
In this paper, an Amplify-and-Forward (AF) cooperative strategy in interference limited networks is considered. In contrast to previously reported work, where the effect of interference is ignored, the effect of multi-user interference in AF schemes is analyzed. It is shown that the interference changes the statistical description of the conventional AF protocol and a statistical expression is subsequently derived. Asymptotic analysis of the expression shows that interference limits the diversity gain of the system and the related channel capacity is bounded by a stationary point. In addition, it is proven that previously proposed relay selection criteria for multi-relay scenarios become inefficient in the presence of interference. Based on a consideration of the interference term, two new selection criteria suitable for different system set-ups are proposed. A theoretical framework for selecting when to apply the proposed selection criteria is also presented.
{"title":"Relay Selection Issues for Amplify-and-Forward Cooperative Systems with Interference","authors":"I. Krikidis, J. Thompson, S. McLaughlin","doi":"10.1109/WCNC.2009.4917941","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917941","url":null,"abstract":"In this paper, an Amplify-and-Forward (AF) cooperative strategy in interference limited networks is considered. In contrast to previously reported work, where the effect of interference is ignored, the effect of multi-user interference in AF schemes is analyzed. It is shown that the interference changes the statistical description of the conventional AF protocol and a statistical expression is subsequently derived. Asymptotic analysis of the expression shows that interference limits the diversity gain of the system and the related channel capacity is bounded by a stationary point. In addition, it is proven that previously proposed relay selection criteria for multi-relay scenarios become inefficient in the presence of interference. Based on a consideration of the interference term, two new selection criteria suitable for different system set-ups are proposed. A theoretical framework for selecting when to apply the proposed selection criteria is also presented.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114459262","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917763
K. Daniel, Thang Tran, C. Wietfeld
Despite recent advancements in cellular mobile network architectures, full coverage for seamless handoffs is still an open issue. Moreover, cost efficient calls for the end users in urban regions with very high coverage can be improved. In many areas overlapping networks like WLAN, GSM and 3G provide alternative wireless links. Ideally, the user should be connected to the most attractive network any time according to predefined priorities using an automatic handover. In this paper, we present a framework for vertical handoff with dualmode (cellular/WLAN) devices by using the conference bridging functionality of a PBX gateway. The communication between client and server will be realized via an overlay signaling channel. Based on the work done in [1] we extend and integrate some important services in the proposed framework: The ICAS (Individual Communication Address Space) feature allows users to be reachable by an alias name without revealing his real phone number. Our proposed Presence Enabled Phonebook shows the system presence and status information of the users' contacts. Beyond the illustration of the framework, the quality and reliability of voice and overlay channel were analyzed in terms of a vertical handoff.
{"title":"IP-Based Overlay Signaling for Seamless Service Roaming in Heterogeneous Networks","authors":"K. Daniel, Thang Tran, C. Wietfeld","doi":"10.1109/WCNC.2009.4917763","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917763","url":null,"abstract":"Despite recent advancements in cellular mobile network architectures, full coverage for seamless handoffs is still an open issue. Moreover, cost efficient calls for the end users in urban regions with very high coverage can be improved. In many areas overlapping networks like WLAN, GSM and 3G provide alternative wireless links. Ideally, the user should be connected to the most attractive network any time according to predefined priorities using an automatic handover. In this paper, we present a framework for vertical handoff with dualmode (cellular/WLAN) devices by using the conference bridging functionality of a PBX gateway. The communication between client and server will be realized via an overlay signaling channel. \u0000 \u0000Based on the work done in [1] we extend and integrate some important services in the proposed framework: The ICAS (Individual Communication Address Space) feature allows users to be reachable by an alias name without revealing his real phone number. Our proposed Presence Enabled Phonebook shows the system presence and status information of the users' contacts. \u0000 \u0000Beyond the illustration of the framework, the quality and reliability of voice and overlay channel were analyzed in terms of a vertical handoff.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114519057","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917537
Dac-Tu Ho, S. Shimamoto
This paper proposes a reliable communication system for high air-traffic oceanic flight routes in aeronautical industry. This proposal uses a single aeronautical VHF channel with an air-to-air radio relay system based on local Ad-hoc networks. A TDMA (Time Division Multiple Access) is proposed to be used for multiple access in a wide-area where each aircraft is assigned with one time slot and kept during its presence in the system in order to transmit its own packet by itself or to relay its packets by neighbor aircrafts. By transmitting in each three frame-periods, each aircraft's position, ID and direction are all used to build a routing table at each neighbor aircraft. Several methods of relaying packets are discussed to reduce packet-loss-ratio occurred from relaying process. In addition, the method to deal with the sparseness of aircrafts in some periods of time was also proposed to make the packet-loss-ratio lower. This system is an effective way not only to allow aviation authority to give more flights but also increase the safety by providing situational awareness frequently for all flights on the oceanic routes.
本文提出了一种适用于航空工业中高空中交通海上航线的可靠通信系统。该方案采用单一航空甚高频信道和基于本地自组织网络的空对空无线电中继系统。提出了一种用于广域多址的时分多址(TDMA, Time Division Multiple Access)技术，其中每架飞机被分配一个时隙并在其存在期间保持，以便自己传输自己的数据包或由相邻飞机中继其数据包。通过在每三个帧周期内传输，每架飞机的位置、ID和方向都被用来建立每个相邻飞机的路由表。讨论了几种中继分组的方法，以减少中继过程中产生的丢包率。此外，为了降低丢包率，还提出了在一定时间段内处理飞机稀疏性的方法。该系统不仅是允许航空当局提供更多航班的有效途径，而且还可以通过频繁地为海洋航线上的所有航班提供态势感知来提高安全性。
{"title":"A Proposal for High Air-Traffic Oceanic Flight Routes Employing Ad-Hoc Networks","authors":"Dac-Tu Ho, S. Shimamoto","doi":"10.1109/WCNC.2009.4917537","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917537","url":null,"abstract":"This paper proposes a reliable communication system for high air-traffic oceanic flight routes in aeronautical industry. This proposal uses a single aeronautical VHF channel with an air-to-air radio relay system based on local Ad-hoc networks. A TDMA (Time Division Multiple Access) is proposed to be used for multiple access in a wide-area where each aircraft is assigned with one time slot and kept during its presence in the system in order to transmit its own packet by itself or to relay its packets by neighbor aircrafts. By transmitting in each three frame-periods, each aircraft's position, ID and direction are all used to build a routing table at each neighbor aircraft. Several methods of relaying packets are discussed to reduce packet-loss-ratio occurred from relaying process. In addition, the method to deal with the sparseness of aircrafts in some periods of time was also proposed to make the packet-loss-ratio lower. This system is an effective way not only to allow aviation authority to give more flights but also increase the safety by providing situational awareness frequently for all flights on the oceanic routes.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122067639","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}
Cooperative diversity is a transmission technique, where multiple terminals forms a virtual antenna array that realizes spatial diversity gain in a distributed fashion. The concept of cooperation has already been introduced to MAC layer to design MAC protocol. However, it's much different with that at physical layer. In this paper, we present a new MAC protocol based on IEEE 802.11, called C-MAC, that can support the basic building block of cooperative system. That is, in C-MAC, source would invite a relay node into data transmission if there exits an available one. During data transmission, source sends the signal to destination at first. The relay node will retransmit the overheard information to the destination at the second time slot. The destination combines two signals from source and helper, thus creating spatial diversity and robustness against channel fading. The C-MAC is backward compatible with legacy IEEE 802.11 system. The performance of C-MAC mainly depends on the physical layer's performance as it just provides the support for cooperation at MAC layer. If the physical layer works well, C-MAC would outperform IEEE 802.11 considering packet error rate. We also do the simulation using ns-2 with assumptive physical parameters. The result shows C-MAC would outperform 802.11 if packet error rate is a little high, and C-MAC would lead to some unfairness to nodes without relay.
{"title":"C-MAC:A MAC Protocol Supporting Cooperation in Wireless LANs","authors":"Huan Jin, Xinbing Wang, Hui Yu, Youyun Xu, Yunfeng Guan, Xinbo Gao","doi":"10.1109/WCNC.2009.4917626","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917626","url":null,"abstract":"Cooperative diversity is a transmission technique, where multiple terminals forms a virtual antenna array that realizes spatial diversity gain in a distributed fashion. The concept of cooperation has already been introduced to MAC layer to design MAC protocol. However, it's much different with that at physical layer. In this paper, we present a new MAC protocol based on IEEE 802.11, called C-MAC, that can support the basic building block of cooperative system. That is, in C-MAC, source would invite a relay node into data transmission if there exits an available one. During data transmission, source sends the signal to destination at first. The relay node will retransmit the overheard information to the destination at the second time slot. The destination combines two signals from source and helper, thus creating spatial diversity and robustness against channel fading. The C-MAC is backward compatible with legacy IEEE 802.11 system. The performance of C-MAC mainly depends on the physical layer's performance as it just provides the support for cooperation at MAC layer. If the physical layer works well, C-MAC would outperform IEEE 802.11 considering packet error rate. We also do the simulation using ns-2 with assumptive physical parameters. The result shows C-MAC would outperform 802.11 if packet error rate is a little high, and C-MAC would lead to some unfairness to nodes without relay.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117040650","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917491
K. Manolakis, David Manuel Gutiérrez Estévez, V. Jungnickel, Wen Xu, C. Drewes
In this paper we investigate the time and frequency synchronization as well as the sector and cell search for the 3GPP Long Term Evolution (LTE) downlink. The proposed algorithms rely on the synchronization and cell-specific reference signals and are hence compliant to most recent 3GPP specifications. Time and (fractional) frequency offset coarse synchronization are performed in the time domain with the cyclic prefix based autocorrelation, while the sector and cell as well as the integer frequency offset are estimated in the frequency domain by using the primary and secondary synchronization signals. To improve the cell detection reliability, the estimated cell is afterwards confirmed through the cell-specific reference signal. All algorithms are evaluated under multipath channel conditions and an initial carrier frequency mismatch. Compromising high performance with reasonable implementation complexity, we draw a practical solution for an LTE receiver.
{"title":"A Closed Concept for Synchronization and Cell Search in 3GPP LTE Systems","authors":"K. Manolakis, David Manuel Gutiérrez Estévez, V. Jungnickel, Wen Xu, C. Drewes","doi":"10.1109/WCNC.2009.4917491","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917491","url":null,"abstract":"In this paper we investigate the time and frequency synchronization as well as the sector and cell search for the 3GPP Long Term Evolution (LTE) downlink. The proposed algorithms rely on the synchronization and cell-specific reference signals and are hence compliant to most recent 3GPP specifications. Time and (fractional) frequency offset coarse synchronization are performed in the time domain with the cyclic prefix based autocorrelation, while the sector and cell as well as the integer frequency offset are estimated in the frequency domain by using the primary and secondary synchronization signals. To improve the cell detection reliability, the estimated cell is afterwards confirmed through the cell-specific reference signal. All algorithms are evaluated under multipath channel conditions and an initial carrier frequency mismatch. Compromising high performance with reasonable implementation complexity, we draw a practical solution for an LTE receiver.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128512227","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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