The theoretical bandwidth advantage of CDMA over FDMA in a Gaussian MAC

被引：4
|
作者：
Chen, B [1 ]
Willett, P [1 ]
机构：
[1] Univ Connecticut, Storrs, CT 06269 USA
来源：
IEEE TRANSACTIONS ON INFORMATION THEORY | 1999年 / 45卷 / 06期
关键词：
capacity region; CDMA; FDMA; MAC;
D O I：
10.1109/18.782131
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
We develop an expression for the minimum extra bandwidth needed for a frequency-division multiple-access (FDMA) system to outperform its code-division (CDMA) counterpart uniformly (that is, for all rate n-tuples) in a Gaussian multiple-access channel (MAC). For equals power sources, the behavior of this factor is as an iterated logarithm of the number of users; hence it increases slowly yet is unbounded. Asymmetric power eases are also studied and it was shown that the equal power scenario provides the least bandwidth expansion factor assuming constant constraint on total power.
引用
收藏
页码：2046 / 2053
页数：8
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