CDMA系统中序列的优化：一种物理力学方法
Optimization of sequences in CDMA systems: a statistical-mechanics approach
摘要：
统计力学方法不仅可用于分析无线通信系统的宏观系统性能，而且可用于讨论无线通信系统的设计问题。本文讨论了码分多址（CDMA）系统中扩频序列的设计问题，作为一个例子，说明了统计力学方法的实用性。本文用复制方法分析了随机扩频CDMA信道输入输出之间的平均互信息，并讨论了以平均互信息作为优化度量的优化问题。它已被证明是最大化的平均互信息正交不变的随机Welch界相等（WBE）扩展序列。
英文摘要：
Statistical mechanics approach is useful not only in analyzing macroscopic system performance of wireless communication systems, but also in discussing design problems of wireless communication systems. In this paper, we discuss a design problem of spreading sequences in code-division multiple-access (CDMA) systems, as an example demonstrating the usefulness of statistical mechanics approach. We analyze, via replica method, the average mutual information between inputs and outputs of a randomly-spread CDMA channel, and discuss the optimization problem with the average mutual information as a measure of optimization. It has been shown that the average mutual information is maximized by orthogonally-invariant random Welch bound equality (WBE) spreading sequences.
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