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Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738)最新文献

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Application of density evolution in turbo-MUD design for overloaded coded CDMA systems 密度演化在超载编码CDMA系统turbo-MUD设计中的应用
Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738) Pub Date : 2004-08-30 DOI: 10.1109/ISSSTA.2004.1371756
S. Morosi, E. Del Re, R. Fantacci, A. Chiassai
{"title":"Application of density evolution in turbo-MUD design for overloaded coded CDMA systems","authors":"S. Morosi, E. Del Re, R. Fantacci, A. Chiassai","doi":"10.1109/ISSSTA.2004.1371756","DOIUrl":"https://doi.org/10.1109/ISSSTA.2004.1371756","url":null,"abstract":"An original turbo multiuser detector for overloaded coded DS-CDMA systems is presented and studied: the performance of the proposed system is tested by Monte Carlo simulations and by means of the density evolution theory. The proposed turbo-MUD receiver is based on the use a combination of a linear MMSE detector in the first stages and an interference cancellation scheme in the successive ones. The inputs of both receivers are the soft information from a bank of turbo decoders. The performance of the proposed receiver can be effectively predicted in overloaded communication systems by means of density evolution technique: the use of this technique also permits us to evaluate the proper number of MMSE iterations, making easier the design of the receiver.","PeriodicalId":340769,"journal":{"name":"Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738)","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122402855","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
The optimum received signal-power distribution for CDMA packet communication systems employing successive interference cancellation 采用连续干扰消除的CDMA分组通信系统的最佳接收信号功率分配
Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738) Pub Date : 2004-08-30 DOI: 10.1109/ISSSTA.2004.1371659
Y. Tadokoro, H. Okada, T. Yamazato, M. Katayama
{"title":"The optimum received signal-power distribution for CDMA packet communication systems employing successive interference cancellation","authors":"Y. Tadokoro, H. Okada, T. Yamazato, M. Katayama","doi":"10.1109/ISSSTA.2004.1371659","DOIUrl":"https://doi.org/10.1109/ISSSTA.2004.1371659","url":null,"abstract":"In CDMA packet communication systems employing the successive interference cancellation (SIC) scheme, the suppression of MAI depends on the received signal-power distribution, in addition to the cross-correlation characteristics of the spreading sequences and the number of transmitted packets. Some work has been done about discovering the received signal-power distribution which makes MAI be suppressed effectively. This distribution minimizes the averaged bit error rate (BER). However, in packet communication systems, it is important to the performance whether packets can be transmitted successfully or not. Even if the averaged BER is high, many packets can be correctly transmitted. It implies that the optimum distribution on averaged BER does not give the best performance of packet transmission. The received signal-power distribution which gives the best performance of packet transmission is derived. Such a distribution makes clear the limit of performance improvement using SIC.","PeriodicalId":340769,"journal":{"name":"Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738)","volume":"237 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126426963","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
Intercarrier interference cancellation in OFDM mobile systems OFDM移动系统中的载波间干扰消除
Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738) Pub Date : 2004-08-30 DOI: 10.1109/ISSSTA.2004.1371740
Lan Yang, Ming Chen, Shixin Cheng, Haifeng Wang
{"title":"Intercarrier interference cancellation in OFDM mobile systems","authors":"Lan Yang, Ming Chen, Shixin Cheng, Haifeng Wang","doi":"10.1109/ISSSTA.2004.1371740","DOIUrl":"https://doi.org/10.1109/ISSSTA.2004.1371740","url":null,"abstract":"Orthogonal frequency division multiplexing (OFDM) is the projected modulation of choice for fourth-generation broadband multimedia wireless systems. However, for mobile applications, channel variations during one OFDM symbol introduce intercarrier interference (ICI), which degrades the performance. This gets more severe as mobile speed, carrier frequency or OFDM symbol duration increases. We analyze ICI for mobile OFDM systems in terms of the complex weighting coefficients, which give the contribution of each transmitter subcarrier to each demodulated subcarrier. Then, we propose a new cancellation method to reduce the effects of Doppler frequency shift. The results show that by using the proposed cancellation scheme, the ICI can be reduced significantly.","PeriodicalId":340769,"journal":{"name":"Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127576563","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
Evolutionary programming with cloning and adaptive cost function applied to multi-user DS-CDMA systems 基于克隆和自适应代价函数的进化规划在多用户DS-CDMA系统中的应用
Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738) Pub Date : 2004-08-30 DOI: 10.1109/ISSSTA.2004.1371684
Taufik Abrão, Fernando Ciriaco Dias Neto, P. Jeszensky
{"title":"Evolutionary programming with cloning and adaptive cost function applied to multi-user DS-CDMA systems","authors":"Taufik Abrão, Fernando Ciriaco Dias Neto, P. Jeszensky","doi":"10.1109/ISSSTA.2004.1371684","DOIUrl":"https://doi.org/10.1109/ISSSTA.2004.1371684","url":null,"abstract":"A new utilization form for the evolutionary programming (EP) algorithm applied to multi-user DS-CDMA (direct sequence code division multiple access) systems in a synchronous AWGN (additive white Gaussian noise) channel is proposed. In order to find the maximum likelihood (ML) solution, the variance matrix for the generation of new candidates was expressed as a function of the following parameters: E/sub b//N/sub 0/; near-far ratio (NFR); cost function (fitness value). A cloning strategy procedure was introduced where the best vectors with the bit-candidates were cloned, reducing drastically the required time for the algorithm convergence to the single user bound (SuB) performance. An improvement in the convergence process was obtained using a parallel interference canceller with soft decision (SD-PIC) for initial vector generation.","PeriodicalId":340769,"journal":{"name":"Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126684353","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: 17
User traffic multiplexing on OFDM downlink 用户流量在OFDM下行链路上复用
Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738) Pub Date : 2004-08-30 DOI: 10.1109/ISSSTA.2004.1371736
B. Popović, J. van de Beek
{"title":"User traffic multiplexing on OFDM downlink","authors":"B. Popović, J. van de Beek","doi":"10.1109/ISSSTA.2004.1371736","DOIUrl":"https://doi.org/10.1109/ISSSTA.2004.1371736","url":null,"abstract":"A user traffic multiplexing scheme for the downlink of an OFDM cellular system is proposed and evaluated. The scheme is based on the set of orthogonal time-frequency (T-F) patterns obtained from a generic Costas sequence. An intercell interference averaging method, based on a randomly variable cyclic time offsetting of the whole set of orthogonal T-F patterns, is also part of the scheme. The time offset is changed for each transmission time interval, according to a cell-specific multilevel pseudo-random sequence. Thus, the intercell OFDM interference becomes limited and noise-like, while no resource planning on the system level is required.","PeriodicalId":340769,"journal":{"name":"Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114461926","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
Accurate FFT processing window timing detection based on maximum SIR criterion in OFCDM wireless access OFCDM无线接入中基于最大SIR准则的精确FFT处理窗时检测
Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738) Pub Date : 2004-08-30 DOI: 10.1093/ietcom/E88-B.2.552
Satoshi Nagata, N. Maeda, H. Atarashi, M. Sawahashi
{"title":"Accurate FFT processing window timing detection based on maximum SIR criterion in OFCDM wireless access","authors":"Satoshi Nagata, N. Maeda, H. Atarashi, M. Sawahashi","doi":"10.1093/ietcom/E88-B.2.552","DOIUrl":"https://doi.org/10.1093/ietcom/E88-B.2.552","url":null,"abstract":"The paper proposes an accurate fast Fourier transform (FFT) window timing detection method based on the maximum signal-to-interference power ratio (SIR) criterion, taking into account the received signal power and intersymbol interference, according to different detected FFT window timings in orthogonal frequency and code division multiplexing (OFCDM) wireless access. The SIR of the received signal after FFT processing is estimated using the desired signal power and the intersymbol interference power calculated using the power delay profile, which is measured by the cross-correlation between the pilot symbol replica and the received signal. Furthermore, since the SIR is calculated only for the received path timing of the first path and those paths exceeding the guard interval duration, which are greater than the noise-threshold value, the computational complexity of the proposed method is low. Computer simulation results show that the proposed scheme reduces the required average received signal energy per symbol-to-background noise power spectrum density ratio (E/sub s//N/sub 0/) for achieving the average packet error rate (PER) of 10/sup -2/ by approximately 1.0 dB compared to the conventional method which detects the forward path timing of the power delay profile (16QAM data modulation, six-path Rayleigh fading channel, maximum delay time of 3 microsec, RMS delay spread of 0.86 microsec).","PeriodicalId":340769,"journal":{"name":"Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121284655","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
Throughput of the 1x EV-DO system with various scheduling algorithms 不同调度算法下1x EV-DO系统的吞吐量
Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738) Pub Date : 2004-08-30 DOI: 10.1109/ISSSTA.2004.1371722
E. Choi, Wan Choi, J. Andrews
{"title":"Throughput of the 1x EV-DO system with various scheduling algorithms","authors":"E. Choi, Wan Choi, J. Andrews","doi":"10.1109/ISSSTA.2004.1371722","DOIUrl":"https://doi.org/10.1109/ISSSTA.2004.1371722","url":null,"abstract":"The average sector throughput of the popular 1x EV-DO system with three different scheduling algorithms is mathematically analyzed for a multicell system with lognormal shadowing. The scheduling algorithms considered are round robin, equal latency, and relative fairness. The trade off between throughput and latency among the three scheduling algorithms is illuminated by the analysis, since the key design parameters are identified. From numerical examples, it is shown that the average throughput in a typical urban area is around 600-800 kbit/s. The results of this paper will help engineers do cellular planning and reliably predict throughput for 1x EV-DO and other data-based cellular systems.","PeriodicalId":340769,"journal":{"name":"Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121887963","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: 22
Minimum bit error probability of large randomly spread MC-CDMA systems in multipath Rayleigh fading 多径瑞利衰落下大随机分布MC-CDMA系统的最小误码概率
Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738) Pub Date : 2004-08-30 DOI: 10.1109/ISSSTA.2004.1371762
R. Muller, A. Tulino
{"title":"Minimum bit error probability of large randomly spread MC-CDMA systems in multipath Rayleigh fading","authors":"R. Muller, A. Tulino","doi":"10.1109/ISSSTA.2004.1371762","DOIUrl":"https://doi.org/10.1109/ISSSTA.2004.1371762","url":null,"abstract":"We address bit error probability of the optimum multiuser detector for multi-carrier code division multiple access in frequency-selective fading channels. We use the replica method, a tool from statistical physics, to calculate the bit error probability in the large system limit for randomly assigned spreading sequences. The analysis allows for binary input symbols with biased probabilities and, therefore, can be used to analyze iterative multiuser decoders.","PeriodicalId":340769,"journal":{"name":"Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738)","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123423685","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: 16
Improved MC-CDMA reception employing two-dimensional decision-feedback pilot and data symbol correction 采用二维决策反馈导频和数据符号校正改进MC-CDMA接收
Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738) Pub Date : 2004-08-30 DOI: 10.1109/ISSSTA.2004.1371663
E. Haas, W. Krzymień
{"title":"Improved MC-CDMA reception employing two-dimensional decision-feedback pilot and data symbol correction","authors":"E. Haas, W. Krzymień","doi":"10.1109/ISSSTA.2004.1371663","DOIUrl":"https://doi.org/10.1109/ISSSTA.2004.1371663","url":null,"abstract":"An algorithm is presented that recovers, to a large degree, the performance degradation due to channel estimation and equalization errors in a multi-carrier code division multiple access (MC-CDMA) system. The algorithm uses the two-dimensional structure of the MC-CDMA frame to estimate the equalization error. It contains two steps that can be applied independently from each other. In the first step, the pilot symbols are corrected and channel estimation and equalization are redone for the received data symbol samples. In the second step, a possible remaining mismatch on the equalized data symbol samples is 're-equalized' and new symbol decisions on the 're-equalized' signal are made. It is shown that the algorithm is able to improve the performance in additive white Gaussian noise (AWGN) and fading channels with and without channel coding. On a frequency-selective fading channel and with standard R/sub cc/=1/2 convolutional coding, a performance improvement of approximately 4.75 dB is possible at a BER of 10/sup -6/.","PeriodicalId":340769,"journal":{"name":"Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123436401","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
An adaptive transmit diversity scheme based on spatial signal combining for TH-PPM UWB 基于空间信号合并的TH-PPM超宽带自适应发射分集方案
Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738) Pub Date : 2004-08-30 DOI: 10.1109/ISSSTA.2004.1371682
S. Niranjayan, A. Nallanathan, B. Kannan
{"title":"An adaptive transmit diversity scheme based on spatial signal combining for TH-PPM UWB","authors":"S. Niranjayan, A. Nallanathan, B. Kannan","doi":"10.1109/ISSSTA.2004.1371682","DOIUrl":"https://doi.org/10.1109/ISSSTA.2004.1371682","url":null,"abstract":"We propose an adaptive transmit diversity scheme for UWB impulse radio (IR), based on free space signal combining, which provides a significant increase in performance compared to the conventional single antenna MRRC receiver. The proposed scheme employs multiple transmitters, which adjust their transmit delays adaptively, in order to achieve perfect overlapping of pulses in space. This scheme uses a single correlator module at the receiver, and hence reduces the hardware complexity significantly, compared to S-RAKE receivers. The purpose behind free space signal combining is to improve the signal strength without multiplying the noise energy at the output of the correlator detector. Therefore, the proposed scheme can provide higher throughput with less complexity.","PeriodicalId":340769,"journal":{"name":"Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738)","volume":"372 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127883407","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
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