Pub Date : 2010-08-01DOI: 10.4108/CHINACOM.2010.114
P. Crespo, Xabier Insausti, J. Ser, Jesús Gutiérrez-Gutiérrez
This paper proposes a low-complexity signal shaping scheme for the transmission of non-binary symbols generated by sources with memory over the AWGN channel. It is based on using the Burrows-Wheeler Transform (BWT) [1] and standard two dimensional (QAM) constellations. The constellation points are driven based on the first order probabilities of the BWT output symbols so that shaping gain is maximized. The proposed system is an extension of the one introduced in [2] for binary sources. To evaluate its performance, the corresponding average energy per transmitted symbol is compared with that obtained when using an ideal source encoder followed by a standard uncoded QAM transmission scheme. In addition, it is shown that the power gain ratio between both systems can be assessed based on the Kullback-Leibler divergence between the first order probability distributions of the BWT output symbols and the Maxwell-Boltzmann probability distribution, obtained under the constraint of achieving an entropy equal to the entropy-rate of the original source.
{"title":"Signal shaping scheme based on the BWT for the transmission of non-binary sources with memory over the AWGN channel","authors":"P. Crespo, Xabier Insausti, J. Ser, Jesús Gutiérrez-Gutiérrez","doi":"10.4108/CHINACOM.2010.114","DOIUrl":"https://doi.org/10.4108/CHINACOM.2010.114","url":null,"abstract":"This paper proposes a low-complexity signal shaping scheme for the transmission of non-binary symbols generated by sources with memory over the AWGN channel. It is based on using the Burrows-Wheeler Transform (BWT) [1] and standard two dimensional (QAM) constellations. The constellation points are driven based on the first order probabilities of the BWT output symbols so that shaping gain is maximized. The proposed system is an extension of the one introduced in [2] for binary sources. To evaluate its performance, the corresponding average energy per transmitted symbol is compared with that obtained when using an ideal source encoder followed by a standard uncoded QAM transmission scheme. In addition, it is shown that the power gain ratio between both systems can be assessed based on the Kullback-Leibler divergence between the first order probability distributions of the BWT output symbols and the Maxwell-Boltzmann probability distribution, obtained under the constraint of achieving an entropy equal to the entropy-rate of the original source.","PeriodicalId":422191,"journal":{"name":"2010 5th International ICST Conference on Communications and Networking in China","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126610874","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 : 2010-08-01DOI: 10.4108/CHINACOM.2010.69
Xiang Wu, J. Thompson
This paper presents a field-programmable gate array (FPGA) implementation of an unbiased minimum mean square error (MMSE) metric based QR-decomposition M (QRDM) algorithm for the multiple-input multiple-output (MIMO) systems. Two advanced techniques, namely the merge-sort (MS) based and winner path expansion (WPE) based sorting schemes have been implemented and validated on an FPGA platform for a 4×4 16-QAM MIMO system. The results show that the MS-QRDM is advantageous in the simplified control circuits and leads to less logic resource use, whereas the WPE-QRDM is able to achieve the minimum use of the computational units and results in fewer multipliers. Furthermore, it also shows that both schemes can support up to 1.6Gbps decoding throughput when they are implemented in a fully pipelined parallel architecture.
{"title":"FPGA design of fixed-complexity high-throughput MIMO detector based on QRDM algorithm","authors":"Xiang Wu, J. Thompson","doi":"10.4108/CHINACOM.2010.69","DOIUrl":"https://doi.org/10.4108/CHINACOM.2010.69","url":null,"abstract":"This paper presents a field-programmable gate array (FPGA) implementation of an unbiased minimum mean square error (MMSE) metric based QR-decomposition M (QRDM) algorithm for the multiple-input multiple-output (MIMO) systems. Two advanced techniques, namely the merge-sort (MS) based and winner path expansion (WPE) based sorting schemes have been implemented and validated on an FPGA platform for a 4×4 16-QAM MIMO system. The results show that the MS-QRDM is advantageous in the simplified control circuits and leads to less logic resource use, whereas the WPE-QRDM is able to achieve the minimum use of the computational units and results in fewer multipliers. Furthermore, it also shows that both schemes can support up to 1.6Gbps decoding throughput when they are implemented in a fully pipelined parallel architecture.","PeriodicalId":422191,"journal":{"name":"2010 5th International ICST Conference on Communications and Networking in China","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125968517","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 : 2010-08-01DOI: 10.4108/CHINACOM.2010.43
Chenyu Zhang, Kai Liu
In this paper, a collision-free on-demand multiple access (CF-ODMA) protocol for mobile ad hoc networks is proposed. In the CF-ODMA protocol, every node obtains collision-free polling service by channel reservation. In addition, a collision resolution algorithm is presented to guarantee that in the present of reservation collisions the access nodes can successfully access channel in sequence, and resolve packet collisions during the contention access period. Simulation results show that the proposed protocol can achieve better performances than the IEEE 802.11 distributed coordination function (DCF) and point coordination function (PCF) mechanisms in terms of throughput, average packet dropping rate and delay.
{"title":"Collision-free on-demand multiple access protocol for mobile ad hoc networks","authors":"Chenyu Zhang, Kai Liu","doi":"10.4108/CHINACOM.2010.43","DOIUrl":"https://doi.org/10.4108/CHINACOM.2010.43","url":null,"abstract":"In this paper, a collision-free on-demand multiple access (CF-ODMA) protocol for mobile ad hoc networks is proposed. In the CF-ODMA protocol, every node obtains collision-free polling service by channel reservation. In addition, a collision resolution algorithm is presented to guarantee that in the present of reservation collisions the access nodes can successfully access channel in sequence, and resolve packet collisions during the contention access period. Simulation results show that the proposed protocol can achieve better performances than the IEEE 802.11 distributed coordination function (DCF) and point coordination function (PCF) mechanisms in terms of throughput, average packet dropping rate and delay.","PeriodicalId":422191,"journal":{"name":"2010 5th International ICST Conference on Communications and Networking in China","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127849786","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 : 2010-08-01DOI: 10.4108/CHINACOM.2010.82
Liang Tang, Zheng Zhou, Lei Shi, Haipeng Yao, J. Zhang, Y. Ye
Bayesian compressive sensing (BCS) utilizes the prior distribution of signal coefficients to reconstruct the original signal. The widely used prior is Laplace and Gaussian distributed. In this paper, we use the scene of L sets of signal sparse coefficients which are statistically related and take advantage of Laplace prior and statistically interrelationship among signals to propose the Laplace prior based distributed Bayesian compressive sensing. We provide the experiment result to demonstrating that the proposed method is an effective reconstruction algorithm and has a good performance.
{"title":"Laplace prior based distributed compressive sensing","authors":"Liang Tang, Zheng Zhou, Lei Shi, Haipeng Yao, J. Zhang, Y. Ye","doi":"10.4108/CHINACOM.2010.82","DOIUrl":"https://doi.org/10.4108/CHINACOM.2010.82","url":null,"abstract":"Bayesian compressive sensing (BCS) utilizes the prior distribution of signal coefficients to reconstruct the original signal. The widely used prior is Laplace and Gaussian distributed. In this paper, we use the scene of L sets of signal sparse coefficients which are statistically related and take advantage of Laplace prior and statistically interrelationship among signals to propose the Laplace prior based distributed Bayesian compressive sensing. We provide the experiment result to demonstrating that the proposed method is an effective reconstruction algorithm and has a good performance.","PeriodicalId":422191,"journal":{"name":"2010 5th International ICST Conference on Communications and Networking in China","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127875115","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 : 2010-08-01DOI: 10.4108/CHINACOM.2010.118
Luying Zhou, Xiaofei Cheng, Y. Yeo, L. Ngoh
Passive optical networks (PONs) represent one of the most attractive access network solutions. TDM and WDM techniques are employed in the PON for higher resource efficiency and capacity, which results in TDM PON and WDM PON respectively. Hybrid WDM-TDM PON combines the advanced features of both TDM PON and WDM PON, and provides a more flexible and cost-effective access network solution. We review the current work in the hybrid WDM-TDM PON architectures, dynamic wavelength and bandwidth allocation (DWBA) algorithms and enabling technologies, and present the development and deployment trends from TDM PON to the hybrid WDM-TDM PON. We analyze the deployment problem incurred under physical constraints, and point out there is a need to develop DWBA algorithms with both upstream and downstream traffic scheduling taken into consideration.
{"title":"Hybrid WDM-TDM PON architectures and DWBA algorithms","authors":"Luying Zhou, Xiaofei Cheng, Y. Yeo, L. Ngoh","doi":"10.4108/CHINACOM.2010.118","DOIUrl":"https://doi.org/10.4108/CHINACOM.2010.118","url":null,"abstract":"Passive optical networks (PONs) represent one of the most attractive access network solutions. TDM and WDM techniques are employed in the PON for higher resource efficiency and capacity, which results in TDM PON and WDM PON respectively. Hybrid WDM-TDM PON combines the advanced features of both TDM PON and WDM PON, and provides a more flexible and cost-effective access network solution. We review the current work in the hybrid WDM-TDM PON architectures, dynamic wavelength and bandwidth allocation (DWBA) algorithms and enabling technologies, and present the development and deployment trends from TDM PON to the hybrid WDM-TDM PON. We analyze the deployment problem incurred under physical constraints, and point out there is a need to develop DWBA algorithms with both upstream and downstream traffic scheduling taken into consideration.","PeriodicalId":422191,"journal":{"name":"2010 5th International ICST Conference on Communications and Networking in China","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127913441","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 : 2010-08-01DOI: 10.4108/CHINACOM.2010.64
H Zhao, Fanggang Wang, Jinghua Kuang, Wenbo Wang, Bin Wu
It is well known that Space-Time Block Codes from orthogonal designs (O-STBC) are linearly Maximum-Likelihood (ML) decodable. However there are not full rate complex O-STBC designs except for two transmit-antennas. Recently, one class of minimum-decoding-complexity STBCs (MDC-STBC) have been studied: (1) they have higher rate than O-STBC; (2) they are single-symbol decodable (SSD) and (3) they can exploit full diversity by constellation rotation (CR). In this paper, we employ precoding technology for these MDC-STBCs to realize: higher-rate, full-diversity, maximum coding gain and half-symbol decodable (HSD), where HSD has the lower complexity than SSD. Simulation results for MDC-STBCs with 4 transmit antennas show that the proposed precoder scheme with HSD decoder can get the same diversity gain and an extra 1dB coding gain than the schemes with CR, only at the cost of 3 bits feedback information for quantifying the precoder.
{"title":"Precoded MDC-STBC scheme with half-symbol decodable receiver","authors":"H Zhao, Fanggang Wang, Jinghua Kuang, Wenbo Wang, Bin Wu","doi":"10.4108/CHINACOM.2010.64","DOIUrl":"https://doi.org/10.4108/CHINACOM.2010.64","url":null,"abstract":"It is well known that Space-Time Block Codes from orthogonal designs (O-STBC) are linearly Maximum-Likelihood (ML) decodable. However there are not full rate complex O-STBC designs except for two transmit-antennas. Recently, one class of minimum-decoding-complexity STBCs (MDC-STBC) have been studied: (1) they have higher rate than O-STBC; (2) they are single-symbol decodable (SSD) and (3) they can exploit full diversity by constellation rotation (CR). In this paper, we employ precoding technology for these MDC-STBCs to realize: higher-rate, full-diversity, maximum coding gain and half-symbol decodable (HSD), where HSD has the lower complexity than SSD. Simulation results for MDC-STBCs with 4 transmit antennas show that the proposed precoder scheme with HSD decoder can get the same diversity gain and an extra 1dB coding gain than the schemes with CR, only at the cost of 3 bits feedback information for quantifying the precoder.","PeriodicalId":422191,"journal":{"name":"2010 5th International ICST Conference on Communications and Networking in China","volume":"93 9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127982221","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 : 2010-08-01DOI: 10.4108/CHINACOM.2010.94
Peng Liu, Juanjuan Yan, Zheng Zheng
The performance of a satellite-to-ground optical communication system with phase modulation is limited by phase fluctuations induced by atmospheric turbulence. To improve the system performance, one effective way is to use coherent detection. In this paper, a satellite-to-ground coherent optical communication system with differential quadrature phase-shift keying (DQPSK) modulation is studied, and a phase estimation algorithm based on M-th power scheme is used. The simulation results show that the phase noise induced by atmospheric turbulence can be suppressed greatly.
{"title":"Analysis of improved performance for a satellite-to-ground coherent optical communication system with DQPSK modulation due to phase estimation","authors":"Peng Liu, Juanjuan Yan, Zheng Zheng","doi":"10.4108/CHINACOM.2010.94","DOIUrl":"https://doi.org/10.4108/CHINACOM.2010.94","url":null,"abstract":"The performance of a satellite-to-ground optical communication system with phase modulation is limited by phase fluctuations induced by atmospheric turbulence. To improve the system performance, one effective way is to use coherent detection. In this paper, a satellite-to-ground coherent optical communication system with differential quadrature phase-shift keying (DQPSK) modulation is studied, and a phase estimation algorithm based on M-th power scheme is used. The simulation results show that the phase noise induced by atmospheric turbulence can be suppressed greatly.","PeriodicalId":422191,"journal":{"name":"2010 5th International ICST Conference on Communications and Networking in China","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127367848","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 : 2010-08-01DOI: 10.4108/CHINACOM.2010.116
G. Baudoin, O. Venard
Despite the progress of information, localization and communication technologies (ICT), traveler information is still very difficult to access for people with sensory disabilities (visual or auditory) during their journeys in urban public transports. Through the experience gained in the French research project INFOMOVILLE, this paper presents the main aspects that are to be considered for the wide deployment of transport information systems accessible to sensory impaired persons. It considers different points of view: technical questions (information, communication, localization, energy), ergonomics, economics, legal and normative context.
{"title":"Information, communication and localization environment for travelers with sensory disabilities in public transports","authors":"G. Baudoin, O. Venard","doi":"10.4108/CHINACOM.2010.116","DOIUrl":"https://doi.org/10.4108/CHINACOM.2010.116","url":null,"abstract":"Despite the progress of information, localization and communication technologies (ICT), traveler information is still very difficult to access for people with sensory disabilities (visual or auditory) during their journeys in urban public transports. Through the experience gained in the French research project INFOMOVILLE, this paper presents the main aspects that are to be considered for the wide deployment of transport information systems accessible to sensory impaired persons. It considers different points of view: technical questions (information, communication, localization, energy), ergonomics, economics, legal and normative context.","PeriodicalId":422191,"journal":{"name":"2010 5th International ICST Conference on Communications and Networking in China","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127378624","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 : 2010-08-01DOI: 10.4108/CHINACOM.2010.134
Zhengguo Sheng, Z. Ding, K. Leung
Cooperative diversity has emerged as a promising approach to improving reception reliability by realizing spatial diversity gains for nodes with single antenna. We consider here cooperative ad-hoc wireless networks where communications between two nodes can be assisted by a single relay using two time slots. This paper continues our investigation of PHY techniques and cross-layer routing algorithms in such networks. Specifically, we investigate here the optimal relay location for cooperative link in networks with infinite node density. By using this result, we analyze the error performance bound for routing algorithms in infinitely dense networks. Furthermore, we study the performance bounds for regularly dense networks with linear topology. Theoretical analysis shows that the proposed routing algorithm performs close to the optimal error performance.
{"title":"Error performance bounds for routing algorithms in wireless cooperative networks","authors":"Zhengguo Sheng, Z. Ding, K. Leung","doi":"10.4108/CHINACOM.2010.134","DOIUrl":"https://doi.org/10.4108/CHINACOM.2010.134","url":null,"abstract":"Cooperative diversity has emerged as a promising approach to improving reception reliability by realizing spatial diversity gains for nodes with single antenna. We consider here cooperative ad-hoc wireless networks where communications between two nodes can be assisted by a single relay using two time slots. This paper continues our investigation of PHY techniques and cross-layer routing algorithms in such networks. Specifically, we investigate here the optimal relay location for cooperative link in networks with infinite node density. By using this result, we analyze the error performance bound for routing algorithms in infinitely dense networks. Furthermore, we study the performance bounds for regularly dense networks with linear topology. Theoretical analysis shows that the proposed routing algorithm performs close to the optimal error performance.","PeriodicalId":422191,"journal":{"name":"2010 5th International ICST Conference on Communications and Networking in China","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130398620","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 : 2010-08-01DOI: 10.4108/CHINACOM.2010.104
K. Zheng, Fanglong Hu, Lei Lei, Wenbo Wang
Femtocells technology has emerged as a promising solution to provide the indoor coverage in the 3rd generation (3G) long-term evolution (LTE) and its advanced (LTE-Advanced) networks. In this paper, we propose a two-step interference coordination scheme to deal with the interference between femtocells in LTE-Advanced networks with carrier aggregation. Each femtocell is assigned a carrier that is non-overlapping with its interfering femtocells or has the least interference in the first step. Then, in the second step, more carriers are attempted to be used by a femtocell in order to improve the system spectrum efficiency based on the specified utility functions. Our simulation results demonstrate the effectiveness of the proposed interference coordination scheme in terms of throughput.
{"title":"Interference coordination between femtocells in LTE-advanced networks with carrier aggregation","authors":"K. Zheng, Fanglong Hu, Lei Lei, Wenbo Wang","doi":"10.4108/CHINACOM.2010.104","DOIUrl":"https://doi.org/10.4108/CHINACOM.2010.104","url":null,"abstract":"Femtocells technology has emerged as a promising solution to provide the indoor coverage in the 3rd generation (3G) long-term evolution (LTE) and its advanced (LTE-Advanced) networks. In this paper, we propose a two-step interference coordination scheme to deal with the interference between femtocells in LTE-Advanced networks with carrier aggregation. Each femtocell is assigned a carrier that is non-overlapping with its interfering femtocells or has the least interference in the first step. Then, in the second step, more carriers are attempted to be used by a femtocell in order to improve the system spectrum efficiency based on the specified utility functions. Our simulation results demonstrate the effectiveness of the proposed interference coordination scheme in terms of throughput.","PeriodicalId":422191,"journal":{"name":"2010 5th International ICST Conference on Communications and Networking in China","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130817824","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：