CDMA codeword optimization: Interference avoidance and convergence via class warfare

被引:62
作者
Rose, C [1 ]
机构
[1] WINLAB, Piscataway, NJ 08855 USA
关键词
adaptive modulation; codeword adaptation; codeword optimization; interference avoidance; sum capacity optimization; vector channels; Welch bound equality (WBE) sequences;
D O I
10.1109/18.945252
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
Interference avoidance has been shown to reduce total square correlation (TSC) for given ensembles of user signature waveforms (codewords) in a synchronous code-division multiple-access (CDMA) system. In all experiments we have conducted, sequential application of interference avoidance produces an optimal codeword set when starting from randomly chosen initial codewords. Here we provide the first formal proof of convergence to optimal codeword ensembles for greedy interference avoidance algorithms augmented by a technique called "class warfare" whereby users which reside in more heavily loaded areas of the signal space purposely interfere with (attack) the reception of users in less crowded areas. Coordination of deliberate interference by a complete class of aggrieved user is also sometimes necessary. Such "attacks" and subsequent codeword adjustment by attacked users are shown to strictly decrease TSC. Along,the way we also show, using linear algebra and a variant of stochastic ordering, equivalence between minimization of TSC and maximization of sum capacity.
引用
收藏
页码:2368 / 2382
页数:15
相关论文
共 25 条
[1]  
ANIGSTEIN P, 2000, P 38 ALL C COMM CONT
[2]  
CHEN KC, 1999, IEEE PERSONAL COMMUN, V6
[3]  
Cover T. M., 2005, ELEM INF THEORY, DOI 10.1002/047174882X
[4]  
GALLAGER RG, 1968, INFORMATION THEORY R
[5]  
Gross D., 1985, Fundamentals of Queueing Theory
[6]   The digital front-end of software radio terminals [J].
Hentschel, T ;
Henker, M ;
Fettweis, G .
IEEE PERSONAL COMMUNICATIONS, 1999, 6 (04) :40-46
[7]  
Marshall Albert W., 1979, INEQUALITIES THEORY, V143
[8]  
POPESCU DC, 1999, P 37 ALL C COMM CONT, P505
[9]  
POPESCU DC, UNPUB IEEE T INFORM
[10]   The software radio development system [J].
Reichhart, SP ;
Youmans, B ;
Dygert, R .
IEEE PERSONAL COMMUNICATIONS, 1999, 6 (04) :20-24