比较不完全信道估计下的DS-CDMA和多载波CDMA

信号处理 Pub Date : 2001-08-06 DOI:10.1109/SSP.2001.955303

Lucy L. Chong, Laurence B. Milstein

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引用次数: 13

摘要

推导了不完全分集组合下直接序列CDMA (DS-CDMA)和多载波CDMA (MC-CDMA)的误码概率表达式。导频信道和数据信道通过具有指数多径强度分布的瑞利衰落信道传输。使用简单的积分器估计信道统计量。然后对DS系统中的多径和MC系统中的多子载波进行不完全信道估计加权并进行组合。在保持数据速率、发射功率和衰落功率不变的情况下，随着带宽的增加，DS系统中的多径数量增加，MC系统中的子载波数量增加。同时，各路径/子载波的信号强度降低，导致信道估计误差增大。我们表明，在DS-CDMA和MC-CDMA中，信道估计中存在分集顺序和信噪比之间的权衡。此外，我们还表明MC-CDMA的性能优于DS-CDMA。

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Comparing DS-CDMA and multicarrier CDMA with imperfect channel estimation

Probability of bit error expressions are derived for direct sequence CDMA (DS-CDMA) and multicarrier CDMA (MC-CDMA) with imperfect diversity combining. Pilot and data channels are transmitted through a Rayleigh fading channel with an exponential multipath intensity profile. Channel statistics are estimated using simple integrators. Then the multipath in the DS system and the multiple subcarriers in the MC system are weighted by the imperfect channel estimates and combined. Keeping the data rate, the transmit power, and the fading power constant, as the bandwidth increases, the number of multipaths increases in the DS system, and the number of subcarriers increases in the MC system. At the same time, the signal strength in each path/subcarrier decreases, and results in larger errors in the channel estimates. We show that there is a tradeoff between diversity order and SNR available for channel estimation in both DS-CDMA and MC-CDMA. Moreover, we also show that MC-CDMA performs better than DS-CDMA.

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来源期刊

信号处理

自引率

0.00%

发文量

5812

期刊介绍： Journal of Signal Processing is an academic journal supervised by China Association for Science and Technology and sponsored by China Institute of Electronics. The journal is an academic journal that reflects the latest research results and technological progress in the field of signal processing and related disciplines. It covers academic papers and review articles on new theories, new ideas, and new technologies in the field of signal processing. The journal aims to provide a platform for academic exchanges for scientific researchers and engineering and technical personnel engaged in basic research and applied research in signal processing, thereby promoting the development of information science and technology. At present, the journal has been included in the three major domestic core journal databases "China Science Citation Database (CSCD), China Science and Technology Core Journals (CSTPCD), Chinese Core Journals Overview" and Coaj. It is also included in many foreign databases such as Scopus, CSA, EBSCO host, INSPEC, JST, etc.