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A Pilot-Aided Multicode CDMA Transmission Over Wireless Channels

机译:无线信道上的先导多码CDMA传输

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To adapt to the time-varying multipath fading associated with the wireless link, we address the use of a pilot-aided fade-resistant transmission scheme based on the multicode code division multiple access (CDMA) technology. In this system, all the information symbols along with the pilot symbol of a user are transmitted simultaneously over the wireless channel. We apply matched filter receivers to estimate time-varying multipath channel coefficients and the contribution of the pilot signals is subtracted from the received signal prior to decoding the information symbols. We analyze the tradeoff between the number of diversity branches and the channel estimation error in the performance. Our study indicates that, depending on the transmitter power and the channel condition, the proposed system is capable of outperforming the conventional CDMA system with known channel state information at the receiver.
机译:为了适应与无线链路相关的时变多径衰落,我们解决了基于多码码分多址(CDMA)技术的导频辅助抗衰落传输方案的使用。在该系统中,所有信息符号以及用户的导频符号都通过无线信道同时发送。我们应用匹配的滤波器接收器来估计时变多径信道系数,并在解码信息符号之前从接收信号中减去导频信号的贡献。我们分析了多样性分支数量与信道估计误差之间的权衡。我们的研究表明,根据发射机的功率和信道状况,所提出的系统能够以接收机处的已知信道状态信息胜过传统的CDMA系统。

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