Title :
Low-rank MMSE detector for synchronous DS-CDMA
Author :
Cai, Xiaodong ; Ge, Hongya ; Akansu, Ali N.
Author_Institution :
Dept. of Electr. & Comput. Eng., New Jersey Inst. of Technol., Newark, NJ, USA
Abstract :
The low-rank minimum mean-squared error (MMSE) detector for direct sequence (DS) spread-spectrum code-division multiple-access (CDMA) is proposed. The low-rank linear MMSE detector lies in a subspace of the signal space. We demonstrate that when the dimension of the signal space is lower than the processing gain and the MMSE detector is obtained using the estimated covariance matrix, the low-rank MMSE detector can perform better than the full rank MMSE detector. A subspace tracking algorithm that tracks both the rank and the signal subspace is used to implement the low-rank MMSE detector adaptively.
Keywords :
AWGN channels; adaptive signal detection; code division multiple access; covariance matrices; least mean squares methods; multiuser channels; radio tracking; radiofrequency interference; spread spectrum communication; AWGN channel; adaptive detector; cellular radio; direct sequence code-division multiple-access; estimated covariance matrix; full rank MMSE detector; inter-cell interference; low-rank linear MMSE detector; minimum mean-squared error; processing gain; signal space dimension; signal subspace tracking; spread-spectrum code-division multiple-access; subspace; subspace tracking algorithm; synchronous DS-CDMA; AWGN; Adaptive signal detection; Covariance matrix; Detectors; Eigenvalues and eigenfunctions; Matched filters; Multiaccess communication; Performance gain; Space technology; Wireless communication;
Conference_Titel :
Signals, Systems, and Computers, 1999. Conference Record of the Thirty-Third Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-7803-5700-0
DOI :
10.1109/ACSSC.1999.831848
