2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications最新文献_第8页

Extended Reconfigurable Linear FeedBack Shift Register Operators for Software Defined Radio 扩展可重构线性反馈移位寄存器算子用于软件无线电

2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications Pub Date : 2008-09-05 DOI: 10.1109/ISSSTA.2008.132

Laurent Alaus, D. Noguet, Jacques Palicot

引用次数: 5

Advanced Antenna Configurations for the Downlink of Multihop Based Cellular Networks 基于多跳的蜂窝网络下行链路的先进天线配置

2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications Pub Date : 2008-09-05 DOI: 10.1109/ISSSTA.2008.147

I. Abdel Nabi, Z. Dawy

引用次数: 0

Sphere Constrained Block RSSE with Per-Survivor Intra-Block Processing for CCK Transmission CCK传输的球约束块RSSE

2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications Pub Date : 2008-09-05 DOI: 10.1109/ISSSTA.2008.53

C. Jonietz, W. Gerstacker, R. Schober

{"title":"Sphere Constrained Block RSSE with Per-Survivor Intra-Block Processing for CCK Transmission","authors":"C. Jonietz, W. Gerstacker, R. Schober","doi":"10.1109/ISSSTA.2008.53","DOIUrl":"https://doi.org/10.1109/ISSSTA.2008.53","url":null,"abstract":"In the wireless local area network (WLAN) standard IEEE 802.11b, complementary code keying (CCK) modulation has been adopted for the high data rate transmission mode, which can be considered as a special type of spread spectrum modulation with data-dependent spreading. In this paper, complexity reduction for block reduced-state sequence estimation (bRSSE), tailored for CCK transmission over frequency-selective channels, is considered. A trellis diagram for the chip phases of the codewords fully describes the CCK code properties. Subset trellises are derived from the full CCK trellis diagram based on set partitioning of the multidimensional CCK code set. The CCK subset trellises connect consecutive bRSSE states in order to form a compound trellis. The Viterbi algorithm (VA) with per-survivor processing is applied to the compound trellis to take the inter-chip interference into account. Inter-codeword interference is also accounted for by state-dependent decision feedback. The resulting scheme is denoted as bRSSE-pS and has a significantly lower complexity than bRSSE with brute-force search. By introducing a sphere constraint on the overall decoding trellis (SC-bRSSE-pS), the complexity of bRSSE-pS can be further reduced. Omitting states in the CCK subset trellises that violate the sphere constraint, edges that emanate from such states can be pruned, and the average number of metric calculations per CCK trellis segment can be reduced. Simulation results show that the performance of bRSSE-pS and SC-bRSSE-pS, respectively, is essentially equivalent to that of bRSSE with brute-force search, while complexity is significantly reduced.","PeriodicalId":334589,"journal":{"name":"2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124018263","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: 0

Interference Mitigation in Multicell LTE Systems: Performance over Correlated Fading Channels 多蜂窝LTE系统的干扰缓解:相关衰落信道上的性能

2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications Pub Date : 2008-09-05 DOI: 10.1109/ISSSTA.2008.32

D. Molteni, Monica Nicoli

引用次数: 8

BER Analysis of Quasi-Orthogonal Codes in Quasi-Synchronous CDMA Communication 准同步CDMA通信中准正交码的误码率分析

2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications Pub Date : 2008-09-05 DOI: 10.1109/ISSSTA.2008.105

S. Jos, P. Kumar, S. Chakrabarti

{"title":"BER Analysis of Quasi-Orthogonal Codes in Quasi-Synchronous CDMA Communication","authors":"S. Jos, P. Kumar, S. Chakrabarti","doi":"10.1109/ISSSTA.2008.105","DOIUrl":"https://doi.org/10.1109/ISSSTA.2008.105","url":null,"abstract":"Code division multiple access (CDMA) schemes and combination of CDMA with OFDM have been considered as attractive multiple access schemes in the second-generation (2G), third-generation (3G) and future broadband wireless systems. In this paper, we studied the performance of DS-CDMA signals with quasi-orthogonal codes namely balanced gold codes and m-sequences in presence of timing synchronization error. The synchronization error considered is smaller than the chip duration. We evaluate the maximum synchronization error that can be tolerated so that complete error-free despreading is guaranteed for the two quasi-orthogonal codes in the absence of additive white Gaussian noise and channel impairments. This provides insight in the synchronization demands for QS-CDMA systems. Also system capacity (the total bit rate which can be transmitted) subject to this synchronization error has been calculated for the two codes. It has been found that m-sequence provide maximum tolerable synchronization error and system capacity as compared to balanced gold code. We have also presented the BER analysis for QS-CDMA. The BER performance of the two quasi-orthogonal sequences at different values of synchronization error is also studied. Monte-Carlo simulations have been carried out to verify analysis with the simulation results.","PeriodicalId":334589,"journal":{"name":"2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115709791","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: 0

Efficient Transmission Technique for MIMO-OFDM Broadcast Channels with Limited Feedback 有限反馈MIMO-OFDM广播信道的高效传输技术

2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications Pub Date : 2008-09-05 DOI: 10.1109/ISSSTA.2008.49

M. Eslami, W. Krzymień

{"title":"Efficient Transmission Technique for MIMO-OFDM Broadcast Channels with Limited Feedback","authors":"M. Eslami, W. Krzymień","doi":"10.1109/ISSSTA.2008.49","DOIUrl":"https://doi.org/10.1109/ISSSTA.2008.49","url":null,"abstract":"In multiuser downlink, the use of multiple antennas at the base station and user terminals leads to a great increase in the system throughput. However, this increase is only achieved with proper transmission techniques which schedule the best set of users and distribute resources according to each user's channel condition. In this paper, a multiuser MIMO-OFDM technique based on partial CSI is presented for broadcast channels, which achieves a greatly increased system throughput. In the proposed scheme, the base station schedules transmission to a subset of users and allocates data streams on each antenna and subcarrier to users based on their received partial CSI. A combination of eigenmode transmission and zero-forcing (ZF) receiver processing is used to separate spatial layers on each subcarrier. The results show the proposed scheme's advantage over limited feedback linear ZF receiver processing and frequency division multiplexing (FDM). The feedback overhead of the proposed scheme over realistic channels is significantly reduced compared to the case where only ZF receiver processing is adopted on each subcarrier.","PeriodicalId":334589,"journal":{"name":"2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130986109","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

Accuracy of UWB Ranging over Multimode Fiber With and Without In-Band WLAN Interference 带内干扰和无带内干扰下多模光纤超宽带测距精度研究

2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications Pub Date : 2008-09-05 DOI: 10.1109/ISSSTA.2008.62

J. George, A. Chamarti, A. Ng'oma, D. Thelen, M. Sauer

引用次数: 0

A Selective Signal Combining Scheme for Noncoherent UWB Systems 一种非相干超宽带系统的选择性信号合并方案

2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications Pub Date : 2008-09-05 DOI: 10.1109/ISSSTA.2008.63

Sekwon Kim, Jaewoon Kim, Youngjin Park, Soonwoo Lee, Y. Shin

引用次数: 0

Scheduling Algorithms for 3GPP Long-Term Evolution Systems: From a Quality of Service Perspective 3GPP长期演进系统的调度算法:基于服务质量的视角

2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications Pub Date : 2008-09-05 DOI: 10.1109/ISSSTA.2008.28

M. Gidlund, Jean-Christophe Laneri

引用次数: 36

Overloading Performance of OCDMA/OCDMA Scheme for Cellular DS-CDMA System on Rayleigh Fading Channel 瑞利衰落信道下蜂窝DS-CDMA系统OCDMA/OCDMA方案的过载性能

2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications Pub Date : 2008-09-05 DOI: 10.1109/ISSSTA.2008.106

Preetam Kumar, S. Jos, S. Chakrabarti

{"title":"Overloading Performance of OCDMA/OCDMA Scheme for Cellular DS-CDMA System on Rayleigh Fading Channel","authors":"Preetam Kumar, S. Jos, S. Chakrabarti","doi":"10.1109/ISSSTA.2008.106","DOIUrl":"https://doi.org/10.1109/ISSSTA.2008.106","url":null,"abstract":"Overloading is a technique to accommodate more number of users than the spreading factor N. This is a bandwidth efficient scheme to increase the number users in a fixed bandwidth. One of the efficient schemes to overload a CDMA system is to use two sets of orthogonal signal waveforms (O/O). The first set is assigned to the N users and the second set is assigned to the additional M users. An iterative multistage detection (IMSD) technique is used to cancel interference between the two sets of users. The interference cancellation receiver uses hard decisions (HDIC) or soft decisions (SDIC) to estimate the interference. In this paper, the BER performance of s-O/O overloading scheme using Walsh-Hadamard (WH) orthogonal codes is evaluated with SDIC receiver on a Rayleigh fading channel. It is observed that this scheme provides the channel overloading of 33% at a BER of 0.0005, with an SNR degradation of about 1 dB as compared to single user performance on a Rayleigh fading channel with real scrambling. With complex scrambling, overloading performance increases significantly to 75%. This is a significant amount of overloading on a Rayleigh fading channel.","PeriodicalId":334589,"journal":{"name":"2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122810560","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: 0