Title :
Improved performance of MMSE multiuser receivers for asynchronous CDMA: preliminary results
Author :
Banelli, Paolo ; Cacopardi, Saverio ; Rugini, Luca
Author_Institution :
D.I.E.I., Perugia Univ., Italy
Abstract :
The minimum mean square error (MMSE) multiuser detector has received great attention as the optimum linear solution for reducing the multiple access interference (MAI) in DS-CDMA systems. In asynchronous frequency selective channels the covariance matrix estimation errors may introduce BER performance degradation. The aim of this paper is to outline such degradation and to improve the MMSE receiver performance by convenient covariance matrix estimations. Two different approaches are introduced. Simulation results are shown in order to validate the effectiveness of the proposed techniques
Keywords :
code division multiple access; covariance matrices; error statistics; estimation theory; least mean squares methods; multiuser channels; radio receivers; radiofrequency interference; signal detection; spread spectrum communication; BER performance degradation; DS-CDMA systems; MMSE multiuser detector; MMSE multiuser receivers; MMSE receiver performance; asynchronous CDMA; asynchronous frequency selective channels; covariance matrix estimation; covariance matrix estimation errors; minimum mean square error; multiple access interference reduction; optimum linear solution; simulation results; Bit error rate; Covariance matrix; Degradation; Detectors; Estimation error; Frequency estimation; Matched filters; Multiaccess communication; Multiple access interference; Multiuser detection;
Conference_Titel :
Communications, 2001. ICC 2001. IEEE International Conference on
Conference_Location :
Helsinki
Print_ISBN :
0-7803-7097-1
DOI :
10.1109/ICC.2001.937132
