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2009 6th International Symposium on Wireless Communication Systems最新文献

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Sampling jitter estimation and mitigation in direct RF sub-sampling receiver architecture 直接射频分采样接收机结构中的采样抖动估计与抑制
2009 6th International Symposium on Wireless Communication Systems Pub Date : 2009-09-07 DOI: 10.1109/ISWCS.2009.5285259
Ville Syrjälä, M. Valkama
{"title":"Sampling jitter estimation and mitigation in direct RF sub-sampling receiver architecture","authors":"Ville Syrjälä, M. Valkama","doi":"10.1109/ISWCS.2009.5285259","DOIUrl":"https://doi.org/10.1109/ISWCS.2009.5285259","url":null,"abstract":"The sampling jitter is particularly problematic in systems where high-frequency signals are sampled. This paper addresses the sampling jitter estimation and cancellation task in the direct RF sub-sampling type radio receivers. The proposed jitter estimation method is based on carefully injecting or superimposing an additional reference signal to the received signal at sampler input. Proper digital signal processing methods are then devised and applied to estimate the sampling jitter realizations from the obtained jittered samples. Using these jitter estimates, combined with proper jitter modelling, the jitter effects can then be efficiently removed from the actual received signal. Careful performance analysis of the overall estimation-cancellation scheme is also carried out using computer simulations with 3GPP LTE type multicarrier signals, assuming also different amounts of RF filtering prior to RF sub-sampling stage.","PeriodicalId":344018,"journal":{"name":"2009 6th International Symposium on Wireless Communication Systems","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128327133","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}
引用次数: 14
Channel partitioning and relay placement in multi-hop cellular networks 多跳蜂窝网络中的信道划分和中继放置
2009 6th International Symposium on Wireless Communication Systems Pub Date : 2009-09-07 DOI: 10.1109/ISWCS.2009.5285236
S. F. Meko, P. Chaporkar
{"title":"Channel partitioning and relay placement in multi-hop cellular networks","authors":"S. F. Meko, P. Chaporkar","doi":"10.1109/ISWCS.2009.5285236","DOIUrl":"https://doi.org/10.1109/ISWCS.2009.5285236","url":null,"abstract":"Relay based multihop cellular system is a promising technique to improve the signal quality in wireless networks. Here, we propose the channel partitioning and relay positioning schemes so as to maximize the number of users admitted in a cell. A user is admitted if the required rate can be provided to it. Based on this scheme, Signal to Interference and Noise Ratio (SINR) received by Base Station (BS) and Fixed Relay Nodes (FRN) are analyzed with emphasis on users at disadvantaged places (worst case SINR). The results show that, optimally deploying FRNs reduced the call blocking rates at least by 30% and improve the SINR significantly.","PeriodicalId":344018,"journal":{"name":"2009 6th International Symposium on Wireless Communication Systems","volume":"613 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133322139","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}
引用次数: 11
Optimized signal mappings for BICM-ID systems over fast fading MIMO channels 快速衰落MIMO信道上BICM-ID系统的优化信号映射
2009 6th International Symposium on Wireless Communication Systems Pub Date : 2009-09-07 DOI: 10.1109/ISWCS.2009.5285241
M. A. Alfasi, Y. Shayan
{"title":"Optimized signal mappings for BICM-ID systems over fast fading MIMO channels","authors":"M. A. Alfasi, Y. Shayan","doi":"10.1109/ISWCS.2009.5285241","DOIUrl":"https://doi.org/10.1109/ISWCS.2009.5285241","url":null,"abstract":"As shown in the literature, the performance of bit-interleaved coded modulation systems (BICM-ID) depends on the binary sequences mapping to constellation symbols. In this paper, we present a new multidimensional mapping for multi-input multi-output communication systems employing BICM-ID over fast fading channel. To introduce the optimized mapping, cost function is derived based on upper bound on the pairwise error probability over fast fading. Analytical and simulation results show that the optimized mapping outperforms the conventional mapping, and other proposed mappings.","PeriodicalId":344018,"journal":{"name":"2009 6th International Symposium on Wireless Communication Systems","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132038347","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}
引用次数: 3
User Satisfaction Based CRRM policy for heterogeneous wireless networks 基于用户满意度的异构无线网络CRRM策略
2009 6th International Symposium on Wireless Communication Systems Pub Date : 2009-09-07 DOI: 10.1109/ISWCS.2009.5285226
Juan Jesús González Delicado, J. Gozálvez
{"title":"User Satisfaction Based CRRM policy for heterogeneous wireless networks","authors":"Juan Jesús González Delicado, J. Gozálvez","doi":"10.1109/ISWCS.2009.5285226","DOIUrl":"https://doi.org/10.1109/ISWCS.2009.5285226","url":null,"abstract":"Beyond 3G wireless networks are characterised by the coexistence and cooperation of heterogeneous Radio Access Technologies (RAT), which requires the design of adequate Common Radio Resources Management (CRRM) techniques capable to exploit their varying characteristics and efficiently use their scarce radio resources. In this context, this paper proposes a novel CRRM initial RAT selection algorithm (USaBS — User Satisfaction Based Selection) designed to provide and guarantee users with a pre-established Quality of Service satisfaction level defined according to their contract and service type.","PeriodicalId":344018,"journal":{"name":"2009 6th International Symposium on Wireless Communication Systems","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121474169","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}
引用次数: 2
Performance analysis of rotated PSK over Nakagami-m fading channels 旋转PSK在Nakagami-m衰落信道上的性能分析
2009 6th International Symposium on Wireless Communication Systems Pub Date : 2009-09-07 DOI: 10.1109/ISWCS.2009.5285323
Ahmet Yilmaz, O. Kucur
{"title":"Performance analysis of rotated PSK over Nakagami-m fading channels","authors":"Ahmet Yilmaz, O. Kucur","doi":"10.1109/ISWCS.2009.5285323","DOIUrl":"https://doi.org/10.1109/ISWCS.2009.5285323","url":null,"abstract":"In this paper rotation of signal constellation together with component interleaving is applied to the original PSK scheme and performance of rotated Phase Shift Keying (PSK) scheme is analyzed over frequency non-selective slowly Nakagami-m fading channels. Then we obtained optimum rotation angles for M-PSK, M = 2,4,8. Numerical and simulation results show that Rotated PSK outperforms unrotated PSK over frequency nonselective slowly Nakagami-m fading channels considerably. Results show that rotation provides diversity order of about two for Nakagami-m fading channels.","PeriodicalId":344018,"journal":{"name":"2009 6th International Symposium on Wireless Communication Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129322638","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}
引用次数: 6
Synchronization in OFDM systems based on a multi-periodic preamble 基于多周期前导的OFDM系统同步
2009 6th International Symposium on Wireless Communication Systems Pub Date : 2009-09-07 DOI: 10.1109/ISWCS.2009.5285253
M. Schellmann
{"title":"Synchronization in OFDM systems based on a multi-periodic preamble","authors":"M. Schellmann","doi":"10.1109/ISWCS.2009.5285253","DOIUrl":"https://doi.org/10.1109/ISWCS.2009.5285253","url":null,"abstract":"By analytical means, this paper investigates the application of a multi-periodic preamble for the synchronization in OFDM systems, which is based on an auto-correlation of the received signal. In contrast to common system configurations, the multi-periodic preamble enables to select the two parameters correlation shift and correlation window length independently of each other. This allows adapting the synchronization process independently to the desired estimation accuracy of the carrier frequency offset (CFO) as well as to the desired noise suppression. It is further shown that significantly improved estimates of the CFO can be yield.","PeriodicalId":344018,"journal":{"name":"2009 6th International Symposium on Wireless Communication Systems","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116125678","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}
引用次数: 4
Schnorr-Euchner sphere decoder with statistical pruning for MIMO systems MIMO系统统计剪枝Schnorr-Euchner球面解码器
2009 6th International Symposium on Wireless Communication Systems Pub Date : 2009-09-07 DOI: 10.1109/ISWCS.2009.5285307
Junil Ahn, Heung-no Lee, Kiseon Kim
{"title":"Schnorr-Euchner sphere decoder with statistical pruning for MIMO systems","authors":"Junil Ahn, Heung-no Lee, Kiseon Kim","doi":"10.1109/ISWCS.2009.5285307","DOIUrl":"https://doi.org/10.1109/ISWCS.2009.5285307","url":null,"abstract":"A near-maximum-likelihood (ML) detection algorithm for spatially multiplexed multiple-input multiple-output (MIMO) systems has been considered. The sphere decoder (SD) is one of the promising techniques to solve the ML problem. However the SD has a loose necessary condition for pruning branches, and it becomes impractical in large dimensional systems. We propose a Schnorr-Euchner SD with statistical pruning (SP-SESD) in order to further reduce complexity with small performance degradation. Squared statistical constraint radius (SCR) and expected partial path metric from unvisited levels are defined from statistics of noises, and two pruning conditions are jointly applied to search tree for detection efficiency. A flexible trade-off between bit error rate (BER) and complexity can be supported by selecting two pruning probabilities in the proposed scheme, and hence one can design various MIMO detectors according to system demands. Simulation results show the proposed SP-SESD requires lower computational complexity than any statistical pruning approaches, although performance degradation is negligible. The proposed algorithm is effective for MIMO systems with any number of antennas.","PeriodicalId":344018,"journal":{"name":"2009 6th International Symposium on Wireless Communication Systems","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127543013","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}
引用次数: 10
Multistage MIMO receivers based on multi-branch interference cancellation for MIMO-CDMA systems MIMO- cdma系统中基于多支路干扰消除的多级MIMO接收机
2009 6th International Symposium on Wireless Communication Systems Pub Date : 2009-09-07 DOI: 10.1109/ISWCS.2009.5285358
Yunlong Cai, R. D. Lamare
{"title":"Multistage MIMO receivers based on multi-branch interference cancellation for MIMO-CDMA systems","authors":"Yunlong Cai, R. D. Lamare","doi":"10.1109/ISWCS.2009.5285358","DOIUrl":"https://doi.org/10.1109/ISWCS.2009.5285358","url":null,"abstract":"In this paper we propose novel multistage receivers based on multiple parallel branches successive interference cancellation (MB-SIC) for the uplink of multiple-input multiple-output code-division multiple-access (MIMO-CDMA) systems. The proposed multistage receivers exploit a conventional ordered SIC for the first stage, followed by a grouping detection strategy and the novel MB-SIC scheme. The grouping detection strategy produces an estimate for the desired user, which consists of the user's antenna data streams, by using the detected information supplied from the first stage. The outputs of the second stage are processed by the proposed schemes using SICs which are equipped with different cancellation orders, so that the branches produce a group of estimated vectors for the desired user. Then, according to a selection rule the MB-SIC selects the refined estimated vector with the best performance for the desired user's antenna streams. Two selection rules are considered, namely, maximum likelihood (ML) and minimum mean square error (MMSE). The simulation results assess the proposed scheme against the best known spatial multiplexing schemes and show that it achieves a substantial capacity increase.","PeriodicalId":344018,"journal":{"name":"2009 6th International Symposium on Wireless Communication Systems","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126227042","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}
引用次数: 1
A novel algorithm to improve the blind receiver for convolutive MIMO systems 一种改进卷积MIMO系统盲接收机的新算法
2009 6th International Symposium on Wireless Communication Systems Pub Date : 2009-09-07 DOI: 10.1109/ISWCS.2009.5285306
I. Habibi, M. Masnadi-Shirazi, Pegah Habibi-Ardekani
{"title":"A novel algorithm to improve the blind receiver for convolutive MIMO systems","authors":"I. Habibi, M. Masnadi-Shirazi, Pegah Habibi-Ardekani","doi":"10.1109/ISWCS.2009.5285306","DOIUrl":"https://doi.org/10.1109/ISWCS.2009.5285306","url":null,"abstract":"A novel approach is presented to convert the convolutive multiple-input multiple-output (MIMO) system with specified number of real receive antennas to an instantaneous MIMO system with virtual larger number of receive antennas. To achieve this goal the signal model in subspace-based channel shortening for the blind separation of convolutive mixtures has been reformulated and the corresponding virtual MIMO system has been presented. Then independent component analysis (ICA) algorithm is employed to evaluate the transmitted data. By virtual increase of the number of antennas the performance of the system improves significantly. Also a modification on the proposed approach for the case of BPSK modulation reduces the required number of receive antennas to half. Overall results have been verified via simulation.","PeriodicalId":344018,"journal":{"name":"2009 6th International Symposium on Wireless Communication Systems","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124425086","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}
引用次数: 1
Filter bank transmission systems: Analysis with phase noise 滤波器组传输系统:相位噪声分析
2009 6th International Symposium on Wireless Communication Systems Pub Date : 2009-09-07 DOI: 10.1109/ISWCS.2009.5285262
N. Moret, A. Tonello
{"title":"Filter bank transmission systems: Analysis with phase noise","authors":"N. Moret, A. Tonello","doi":"10.1109/ISWCS.2009.5285262","DOIUrl":"https://doi.org/10.1109/ISWCS.2009.5285262","url":null,"abstract":"This paper addresses the effect of the phase noise on filter bank modulation systems. We compare the Discrete Multitone (DMT) with the Filtered Multitone (FMT) systems developing an analysis of the distortion due to the Common Phase Error (CPE), the Inter Symbol Interference (ISI) and the Inter Channel Interference (ICI). We consider the non-coherent (NCR) and the coherent receiver (CR) where the NCR estimates the data symbols without the knowledge of the CPE while the CR assumes perfect knowledge of the CPE.","PeriodicalId":344018,"journal":{"name":"2009 6th International Symposium on Wireless Communication Systems","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124745288","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}
引用次数: 1
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