Spectral efficiency of CDMA with random spreading

被引：662

作者：

Verdú, S

Shamai, S

机构：

[1] Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA

[2] Technion Israel Inst Technol, Dept Elect Engn, IL-32000 Haifa, Israel

来源：

IEEE TRANSACTIONS ON INFORMATION THEORY | 1999年 / 45卷 / 02期

关键词：

channel capacity; code-division multiple access; Gaussian channels; multiuser detection; multiuser information theory; spread spectrum;

D O I：

10.1109/18.749007

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

The CDMA channel with randomly and independently chosen spreading sequences accurately models the situation where pseudonoise sequences span many symbol periods, Furthermore, its analysis provides a comparison baseline for CDMA channels with deterministic signature waveforms spanning one symbol period, We analyze the spectral efficiency (total capacity per chip) as a function of the number of users, spreading gain, and signal-to-noise ratio, and we quantify the loss in efficiency relative to an optimally chosen set of signature sequences and relative to multiaccess with no spreading. White Gaussian background noise and equal-power synchronous users are assumed. The following receivers are analyzed: a) optimal joint processing, b) single-user matched filtering, c) decorrelation, and d) MMSE linear processing.

引用

页码：622 / 640

页数：19

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