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首页> 外文期刊>IEEE Transactions on Information Theory >Performance of multicarrier CDMA in frequency-selective fading via statistical physics
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Performance of multicarrier CDMA in frequency-selective fading via statistical physics

机译：统计物理学中多载波CDMA在频率选择性衰落中的性能

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摘要

This correspondence extends previous work on direct-sequence code-division multiple access (DS-CDMA) to give a single-user characterization of multicarrier (MC) CDMA systems. Results on the error performance and information rate of a family of multiuser detectors for MC-CDMA are obtained using the replica method, which was originally developed in statistical physics. The central result is the "decoupling principle", namely, an MC-CDMA channel with frequency-selective fading followed by a generic multiuser detection front end can be decoupled into a bank of single-user fading channels in the large-system limit. Thus, conditioned on one's fading coefficients, each user essentially experiences an equivalent single-user Gaussian channel with a degradation in the signal-to-noise ratio (SNR) in lieu of multiaccess interference. A set of joint equations is identified, which determines the degradation for each user, known as the multiuser efficiency. The spectral efficiencies under both optimal joint decoding and separate single-user decoding following multiuser detection are obtained analytically. The result applies to arbitrary input distribution and SNRs, and to optimal multiuser detection as well as various suboptimal schemes.
机译：这种对应关系扩展了先前有关直接序列码分多址（DS-CDMA）的工作，以给出多载波（MC）CDMA系统的单用户特征。使用最初在统计物理学中开发的复制方法，可以获得有关MC-CDMA多用户检测器系列的错误性能和信息率的结果。中心结果是“解耦原理”，即，在大型系统范围内，具有频率选择性衰落的MC-CDMA信道和随后的通用多用户检测前端可以解耦为一组单用户衰落信道。因此，以一个人的衰落系数为条件，每个用户本质上都会经历一个等效的单用户高斯信道，其信噪比（SNR）下降而不是多址干扰。确定一组联合方程式，该方程式确定每个用户的性能下降，称为多用户效率。通过解析获得最优联合解码和多用户检测之后的单独单用户解码下的频谱效率。结果适用于任意输入分布和SNR，并且适用于最佳多用户检测以及各种次优方案。

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