Title :
Downlink beamforming for DS-CDMA mobile radio with multimedia services
Author :
Liang, Ying-Chang ; Chin, Francois P S ; Liu, K. J Ray
Author_Institution :
Centre for Wireless Commun., Singapore
fDate :
7/1/2001 12:00:00 AM
Abstract :
Downlink beamforming is a promising technique for direct-sequence code-division multiple-access (DS-CDMA) systems with multimedia services to effectively reduce strong interference induced by high data rate users. A new downlink beamforming technique is proposed that converts the downlink beamforming problem into a virtual uplink one and takes into account the data rate information of all users. Since the main complexity of this method is due to the existence of multidelay paths, two simplified algorithms are suggested using an equivalent one-path channel vector to replace multipath channel vectors. Computer simulation results are given to evaluate the downlink capacity of DS-CDMA systems using a base station antenna array and the new algorithms proposed
Keywords :
adaptive antenna arrays; array signal processing; code division multiple access; interference suppression; land mobile radio; linear algebra; multimedia communication; multipath channels; multiuser channels; radio links; radiofrequency interference; spread spectrum communication; DS-CDMA mobile radio; adaptive beamforming; algorithms; base station antenna array; computer simulation results; data rate information; direct-sequence code-division multiple-access; downlink beamforming; downlink capacity; high data rate users; interference reduction; multidelay paths; multimedia services; multipath channel vectors; one-path channel vector; uniform linear array; virtual uplink; Antenna arrays; Array signal processing; Base stations; Computer simulation; Downlink; Land mobile radio; Multiaccess communication; Multimedia systems; Multipath channels; Multiple access interference;
Journal_Title :
Communications, IEEE Transactions on
