Title :
Interference avoidance versus iterative water filling in multiaccess vector channels
Author :
Popescu, Dimitrie C. ; Popescu, Otilia ; Rose, Christopher
Author_Institution :
Dept. of Electr. Eng., Texas Univ., San Antonio, TX, USA
Abstract :
We present an analysis of the relationship between the application of greedy interference avoidance and that of iterative water filling for vector multiaccess channels. The two methods converge to fixed points with similar properties corresponding to maximum sum capacity. However, the former is used for optimizing CDMA codewords, whereas the latter is used for optimizing transmit covariance matrices. We present numerical results from simulations and make a parallel between the two procedures, discussing differences and similarities.
Keywords :
code division multiple access; covariance matrices; interference suppression; iterative methods; radiofrequency interference; CDMA codeword optimization; greedy interference avoidance; iterative water filling; multiaccess channels; multiaccess vector channels; transmit covariance matrix optimization; Covariance matrix; Equations; Filling; Interference; Iterative methods; Matched filters; Multiaccess communication; Numerical simulation; Optimization methods; Vectors;
Conference_Titel :
Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th
Print_ISBN :
0-7803-8521-7
DOI :
10.1109/VETECF.2004.1400402
