Pub Date : 2011-11-01DOI: 10.1109/ISWCS.2011.6125384
S. Kahraman, M. Çelebi
In this paper we introduce an efficient decoding method which is based on the dimensionality reduction of the sphere decoder search tree for the golden code. A codeword of the golden code has four independent m-QAM data symbols, hence, the required complexity of the exhaustive-search decoder is m4. An efficient implementation of the maximum-likelihood decoder for the golden code with a worst-case complexity is known to be proportional to m2.5. Our motivation is for an efficient decoder with a worst-case complexity of no more than m2.5. In this purpose, we show that our proposed method has m2 complexity in the worst-case with a loss of only 1 dB with respect to optimal decoding.
{"title":"Dimensionality reduction for the golden code with worst-case decoding complexity of O(m2)","authors":"S. Kahraman, M. Çelebi","doi":"10.1109/ISWCS.2011.6125384","DOIUrl":"https://doi.org/10.1109/ISWCS.2011.6125384","url":null,"abstract":"In this paper we introduce an efficient decoding method which is based on the dimensionality reduction of the sphere decoder search tree for the golden code. A codeword of the golden code has four independent m-QAM data symbols, hence, the required complexity of the exhaustive-search decoder is m4. An efficient implementation of the maximum-likelihood decoder for the golden code with a worst-case complexity is known to be proportional to m2.5. Our motivation is for an efficient decoder with a worst-case complexity of no more than m2.5. In this purpose, we show that our proposed method has m2 complexity in the worst-case with a loss of only 1 dB with respect to optimal decoding.","PeriodicalId":414065,"journal":{"name":"2011 8th International Symposium on Wireless Communication Systems","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116166364","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 : 2011-11-01DOI: 10.1109/ISWCS.2011.6125291
Poelzl Christiane
Factors influencing the public' risk perception have already been investigated since the 70s of the last century. With the increased use of mobile telecommunication and the increased public attention to potential health risks from electromagnetic fields, the risk perception and society's dealing with the topic “mobile telecommunication” came into focus. From 2002 to 2008, the German Mobile Telecommunication Research Programme was carried out under the leadership of the Federal Office for Radiation Protection (BfS). Aim of the research programme was to investigate the adequacy of the current limit values regarding the protection against adverse health effects caused by electromagnetic fields. Within the research program also studies on risk perception were conducted. They had the objective to highlight society's perception of the subject “electromagnetic fields of mobile telecommunication in Germany" as a whole and in specific groups, e.g. electromagnetic hypersensitive persons. The paper describes central findings.
{"title":"Mobile telecommunication: Current knowledge on risk perception and risk communication: Results gained within the German Mobile Telecommunication Research Programme","authors":"Poelzl Christiane","doi":"10.1109/ISWCS.2011.6125291","DOIUrl":"https://doi.org/10.1109/ISWCS.2011.6125291","url":null,"abstract":"Factors influencing the public' risk perception have already been investigated since the 70s of the last century. With the increased use of mobile telecommunication and the increased public attention to potential health risks from electromagnetic fields, the risk perception and society's dealing with the topic “mobile telecommunication” came into focus. From 2002 to 2008, the German Mobile Telecommunication Research Programme was carried out under the leadership of the Federal Office for Radiation Protection (BfS). Aim of the research programme was to investigate the adequacy of the current limit values regarding the protection against adverse health effects caused by electromagnetic fields. Within the research program also studies on risk perception were conducted. They had the objective to highlight society's perception of the subject “electromagnetic fields of mobile telecommunication in Germany\" as a whole and in specific groups, e.g. electromagnetic hypersensitive persons. The paper describes central findings.","PeriodicalId":414065,"journal":{"name":"2011 8th International Symposium on Wireless Communication Systems","volume":"284 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115291177","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 : 2011-11-01DOI: 10.1109/ISWCS.2011.6125367
K. Tateishi, K. Higuchi
This paper presents an adaptive amplify-and-forward (AF)-type relaying method appropriate for the cellular downlink. The proposed method adaptively selects active relay stations (RSs) based on the path loss between each set of user equipment (UE) and the base station (BS) and that between each RS in order to avoid unnecessary enhancement of inter-cell interference and bandwidth reduction due to transmission relay. Furthermore, to enhance the spectrum efficiency when relaying, the frequency used for the relay transmission from the RS to the cell-edge user is reused for the direct transmission from the BS to the cell-center user. Based on computer simulation, the system-level average throughput and cell-edge user throughput of the proposed method are compared to those for a case using no relaying and a conventional repeater. The simulation results show the effectiveness of the proposed method.
{"title":"Adaptive amplify-and-forward relaying for cellular downlink","authors":"K. Tateishi, K. Higuchi","doi":"10.1109/ISWCS.2011.6125367","DOIUrl":"https://doi.org/10.1109/ISWCS.2011.6125367","url":null,"abstract":"This paper presents an adaptive amplify-and-forward (AF)-type relaying method appropriate for the cellular downlink. The proposed method adaptively selects active relay stations (RSs) based on the path loss between each set of user equipment (UE) and the base station (BS) and that between each RS in order to avoid unnecessary enhancement of inter-cell interference and bandwidth reduction due to transmission relay. Furthermore, to enhance the spectrum efficiency when relaying, the frequency used for the relay transmission from the RS to the cell-edge user is reused for the direct transmission from the BS to the cell-center user. Based on computer simulation, the system-level average throughput and cell-edge user throughput of the proposed method are compared to those for a case using no relaying and a conventional repeater. The simulation results show the effectiveness of the proposed method.","PeriodicalId":414065,"journal":{"name":"2011 8th International Symposium on Wireless Communication Systems","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114595747","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 : 2011-11-01DOI: 10.1109/ISWCS.2011.6125283
Nuwan S. Ferdinand, Nandana Rajatheva, M. Latva-aho
We present performance analysis of multiple input multiple output (MIMO) amplify-and-forward (AF) two-hop relay system having asymmetric independent channels of Nakagami-m fading and Rician fading. By considering channel state information (CSI)-assisted relaying, we derive outage probability, average symbol error rate (SER) and ergodic capacity. Further we provide high SNR results to understand the depth of system performance and diversity gain. Finally, we present Monte Carlo simulations to verify our analytical results.
{"title":"Performance of OSTBC MIMO amplify-and-forward two-hop relay system with asymmetric channels","authors":"Nuwan S. Ferdinand, Nandana Rajatheva, M. Latva-aho","doi":"10.1109/ISWCS.2011.6125283","DOIUrl":"https://doi.org/10.1109/ISWCS.2011.6125283","url":null,"abstract":"We present performance analysis of multiple input multiple output (MIMO) amplify-and-forward (AF) two-hop relay system having asymmetric independent channels of Nakagami-m fading and Rician fading. By considering channel state information (CSI)-assisted relaying, we derive outage probability, average symbol error rate (SER) and ergodic capacity. Further we provide high SNR results to understand the depth of system performance and diversity gain. Finally, we present Monte Carlo simulations to verify our analytical results.","PeriodicalId":414065,"journal":{"name":"2011 8th International Symposium on Wireless Communication Systems","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121674408","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 : 2011-11-01DOI: 10.1109/ISWCS.2011.6125372
Henning Zörlein, Dejan E. Lazich, M. Bossert
In this paper, the real-valued Compressed Sensing (CS)-based error correction scheme which was proposed by Candes and Tao is evaluated against the background of channel coding theory. Substantial differences to conventional linear block codes over Galois fields are reviewed and interpreted. A unified channel model is introduced. It enables performance evaluation of more realistic almost sparse channels, which are of interest for communication applications. It is shown by simulations that certain variations of the CS based error correction scheme are suitable for special channels. Additionally, explanations for the noise sensitivity of CS based error correction schemes are given.
{"title":"Performance of error correction based on Compressed Sensing","authors":"Henning Zörlein, Dejan E. Lazich, M. Bossert","doi":"10.1109/ISWCS.2011.6125372","DOIUrl":"https://doi.org/10.1109/ISWCS.2011.6125372","url":null,"abstract":"In this paper, the real-valued Compressed Sensing (CS)-based error correction scheme which was proposed by Candes and Tao is evaluated against the background of channel coding theory. Substantial differences to conventional linear block codes over Galois fields are reviewed and interpreted. A unified channel model is introduced. It enables performance evaluation of more realistic almost sparse channels, which are of interest for communication applications. It is shown by simulations that certain variations of the CS based error correction scheme are suitable for special channels. Additionally, explanations for the noise sensitivity of CS based error correction schemes are given.","PeriodicalId":414065,"journal":{"name":"2011 8th International Symposium on Wireless Communication Systems","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123396736","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 : 2011-11-01DOI: 10.1109/ISWCS.2011.6125310
Khodr A. Saaifan, W. Henkel
In this paper, we consider the detection problem of binary signals corrupted by Class-A interference for two observations per symbol. The Class-A density contains infinitely many terms of scaled Gaussian-mixture densities, which yields an optimum detector that requires a high computational complexity. The linear (Gaussian) detector can be used, but it suffers from a significant performance degradation in stong impulse environments. The main objective of this paper is to design a simple detector with optimum performance. We start from the optimum decision boundaries, where we propose a piecewise linear approximation for nonlinear regions. As a result, we introduce a novel piecewise detector, which has much less complexity compared with the optimum one. Simulation results show a near-optimal performance for the proposed detectors in different impulse channel environments. Moreover, we show that one and two piecewise linear approximation per each nonlinear region is sufficient to approach the optimum performance.
{"title":"A linear piecewise suboptimum detector for signals in class-A noise","authors":"Khodr A. Saaifan, W. Henkel","doi":"10.1109/ISWCS.2011.6125310","DOIUrl":"https://doi.org/10.1109/ISWCS.2011.6125310","url":null,"abstract":"In this paper, we consider the detection problem of binary signals corrupted by Class-A interference for two observations per symbol. The Class-A density contains infinitely many terms of scaled Gaussian-mixture densities, which yields an optimum detector that requires a high computational complexity. The linear (Gaussian) detector can be used, but it suffers from a significant performance degradation in stong impulse environments. The main objective of this paper is to design a simple detector with optimum performance. We start from the optimum decision boundaries, where we propose a piecewise linear approximation for nonlinear regions. As a result, we introduce a novel piecewise detector, which has much less complexity compared with the optimum one. Simulation results show a near-optimal performance for the proposed detectors in different impulse channel environments. Moreover, we show that one and two piecewise linear approximation per each nonlinear region is sufficient to approach the optimum performance.","PeriodicalId":414065,"journal":{"name":"2011 8th International Symposium on Wireless Communication Systems","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128379457","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 : 2011-11-01DOI: 10.1109/ISWCS.2011.6125413
P. Karunakaran, P. Suryasarman, Vinod Ramaswamy, K. Kuchi, Deviraj Klutto Milleth Jeniston, B. Ramamurthi
Modern cellular networks are inherently interference limited, and therefore, pilot design is extremely important to the overall system performance. The pilots have to be carefully arranged and modulated to track the fading channel as well as to suppress the interference efficiently. 4G wireless systems based on OFDMA use pilot design strategies that can be classified as ‘Data on Pilot’ and ‘Pilot on Pilot’. In this paper, a ‘Null on Pilot’ scheme that uses null tones and pilot tones to avoid most of the interference on the pilots is considered. Various design aspects of these three pilot schemes are discussed in detail. The channel estimation, interference covariance estimation, link performance with different interference profiles, and system throughput are analyzed and compared with these pilot schemes. It is shown that the popular approach of ‘Data on Pilot’ scheme is inferior to the other two approaches in exploiting the post-processing SNR gain of MMSE interference suppression receivers. The performances of ‘Null on Pilot’ and ‘Pilot on Pilot’ are quite similar.
现代蜂窝网络具有固有的干扰限制，因此，导频设计对系统整体性能至关重要。为了跟踪衰落信道并有效地抑制干扰，必须对导频进行精心布置和调制。基于OFDMA的4G无线系统使用先导设计策略，可分为“数据先导”和“先导先导”。本文考虑了一种“导频空”方案，该方案使用零音和导频音来避免对导频的大部分干扰。详细讨论了这三个试验方案的各个设计方面。分析和比较了这些试验方案的信道估计、干扰协方差估计、不同干扰情况下的链路性能和系统吞吐量。结果表明，在利用MMSE干扰抑制接收机的后处理信噪比增益方面，常用的“导频数据”方案不如其他两种方法。“Null on Pilot”和“Pilot on Pilot”的性能非常相似。
{"title":"On pilot design for interference limited OFDM systems","authors":"P. Karunakaran, P. Suryasarman, Vinod Ramaswamy, K. Kuchi, Deviraj Klutto Milleth Jeniston, B. Ramamurthi","doi":"10.1109/ISWCS.2011.6125413","DOIUrl":"https://doi.org/10.1109/ISWCS.2011.6125413","url":null,"abstract":"Modern cellular networks are inherently interference limited, and therefore, pilot design is extremely important to the overall system performance. The pilots have to be carefully arranged and modulated to track the fading channel as well as to suppress the interference efficiently. 4G wireless systems based on OFDMA use pilot design strategies that can be classified as ‘Data on Pilot’ and ‘Pilot on Pilot’. In this paper, a ‘Null on Pilot’ scheme that uses null tones and pilot tones to avoid most of the interference on the pilots is considered. Various design aspects of these three pilot schemes are discussed in detail. The channel estimation, interference covariance estimation, link performance with different interference profiles, and system throughput are analyzed and compared with these pilot schemes. It is shown that the popular approach of ‘Data on Pilot’ scheme is inferior to the other two approaches in exploiting the post-processing SNR gain of MMSE interference suppression receivers. The performances of ‘Null on Pilot’ and ‘Pilot on Pilot’ are quite similar.","PeriodicalId":414065,"journal":{"name":"2011 8th International Symposium on Wireless Communication Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128484457","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 : 2011-11-01DOI: 10.1109/ISWCS.2011.6125410
D. Lucani, J. Kliewer
We consider two-hop line networks where the communication links are bursty packet erasure channels modeled as a simple two-state Gilbert-Elliott channel. The first and second node in the line have local information with Poisson-distributed arrivals available and intend to communicate this information to the receiving node in the line. We consider an online approach and random linear network coding for erasure correction. We provide a queueing-theoretic analysis of two different models, a genie aided full duplex model and a partially genie aided half-duplex model, where the genie only provides the channel state information. Channel-aware policies are shown to reduce delay by up to a factor of 3 in our examples and significantly increase the network's stable throughput region compared to a simple queue-length driven policy.
{"title":"On the delay and energy performance in coded two-hop line networks with bursty erasures","authors":"D. Lucani, J. Kliewer","doi":"10.1109/ISWCS.2011.6125410","DOIUrl":"https://doi.org/10.1109/ISWCS.2011.6125410","url":null,"abstract":"We consider two-hop line networks where the communication links are bursty packet erasure channels modeled as a simple two-state Gilbert-Elliott channel. The first and second node in the line have local information with Poisson-distributed arrivals available and intend to communicate this information to the receiving node in the line. We consider an online approach and random linear network coding for erasure correction. We provide a queueing-theoretic analysis of two different models, a genie aided full duplex model and a partially genie aided half-duplex model, where the genie only provides the channel state information. Channel-aware policies are shown to reduce delay by up to a factor of 3 in our examples and significantly increase the network's stable throughput region compared to a simple queue-length driven policy.","PeriodicalId":414065,"journal":{"name":"2011 8th International Symposium on Wireless Communication Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129893583","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 : 2011-11-01DOI: 10.1109/ISWCS.2011.6125418
S. Vassaki, M. Poulakis, A. Panagopoulos, P. Constantinou
Cognitive radio technology aims at the efficient utilization of the limited radio resources and the improvement of flexibility of spectrum usage in wireless networks. The main idea of this technology is the development of intelligent networks where the unlicensed secondary users may coexist with the licensed primary users, always limited by the obligation not to affect their communication. In this paper, we consider a spectrum underlay cognitive radio system operating in fading environment. Guaranteeing that the average interference limit constraint to primary users is satisfied, we propose a quality of service (QoS)-driven power allocation scheme, with a view to maximizing the effective capacity of the secondary users. The proposed scheme takes into consideration the interference of primary user to the secondary user, in order to accomplish the optimal allocation more realistically. Finally, the proposed allocation scheme has been evaluated through numerical simulations that confirm the presented theoretical analysis.
{"title":"Optimal power allocation under QoS constraints in cognitive radio systems","authors":"S. Vassaki, M. Poulakis, A. Panagopoulos, P. Constantinou","doi":"10.1109/ISWCS.2011.6125418","DOIUrl":"https://doi.org/10.1109/ISWCS.2011.6125418","url":null,"abstract":"Cognitive radio technology aims at the efficient utilization of the limited radio resources and the improvement of flexibility of spectrum usage in wireless networks. The main idea of this technology is the development of intelligent networks where the unlicensed secondary users may coexist with the licensed primary users, always limited by the obligation not to affect their communication. In this paper, we consider a spectrum underlay cognitive radio system operating in fading environment. Guaranteeing that the average interference limit constraint to primary users is satisfied, we propose a quality of service (QoS)-driven power allocation scheme, with a view to maximizing the effective capacity of the secondary users. The proposed scheme takes into consideration the interference of primary user to the secondary user, in order to accomplish the optimal allocation more realistically. Finally, the proposed allocation scheme has been evaluated through numerical simulations that confirm the presented theoretical analysis.","PeriodicalId":414065,"journal":{"name":"2011 8th International Symposium on Wireless Communication Systems","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130778380","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 : 2011-11-01DOI: 10.1109/ISWCS.2011.6125321
S. Tarnoi, W. Kumwilaisak, P. Saengudomlert
This paper proposes a QoS-aware routing protocol in lossy wireless networks to support heterogeneous layered unicast transmissions and to improve energy usage through cooperative network coding (CNC). The proposed protocol consists of two steps. The first step uses an optimization framework to compute routes of all layered unicast flows. The constraints of this optimization problem are based on the Quality-of-Service (QoS) guarantee, the transmission rate of each data layer, and interference effects in wireless transmissions. The second step decides whether or not CNC will be applied to different unicast flows at intermediate nodes. The decision criterions are based on the network structure and the QoS guarantee. In particular, if CNC at any intermediate node does not result in violating the QoS requirements of the involved unicast flows, CNC will be applied. Else, different unicast flows will be separately transmitted to destinations without CNC. Numerical results from different network topologies and QoS requirements show that the proposed routing protocol gives better throughput and energy efficiency while providing the QoS guarantees to multiple unicast flows compared to existing unicast transmission schemes.
{"title":"QoS-aware routing protocol for heterogeneous wireless unicasts with cooperative network coding","authors":"S. Tarnoi, W. Kumwilaisak, P. Saengudomlert","doi":"10.1109/ISWCS.2011.6125321","DOIUrl":"https://doi.org/10.1109/ISWCS.2011.6125321","url":null,"abstract":"This paper proposes a QoS-aware routing protocol in lossy wireless networks to support heterogeneous layered unicast transmissions and to improve energy usage through cooperative network coding (CNC). The proposed protocol consists of two steps. The first step uses an optimization framework to compute routes of all layered unicast flows. The constraints of this optimization problem are based on the Quality-of-Service (QoS) guarantee, the transmission rate of each data layer, and interference effects in wireless transmissions. The second step decides whether or not CNC will be applied to different unicast flows at intermediate nodes. The decision criterions are based on the network structure and the QoS guarantee. In particular, if CNC at any intermediate node does not result in violating the QoS requirements of the involved unicast flows, CNC will be applied. Else, different unicast flows will be separately transmitted to destinations without CNC. Numerical results from different network topologies and QoS requirements show that the proposed routing protocol gives better throughput and energy efficiency while providing the QoS guarantees to multiple unicast flows compared to existing unicast transmission schemes.","PeriodicalId":414065,"journal":{"name":"2011 8th International Symposium on Wireless Communication Systems","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130989358","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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