Title :
A downlink beamforming method for coherent detection in DS/CDMA systems
Author :
Lee, Joonsung ; Lee, Chungyong ; Chun, Byungjin ; Oh, Changheon
Author_Institution :
Dept. of Electr. & Electron. Eng., Yonsei Univ., Seoul, South Korea
Abstract :
A downlink beamforming method, which has a common pilot channel for coherent detection and a traffic channel for the desired user, is proposed. To solve the phase mismatch between traffic and pilot signals at a desired mobile, the proposed downlink beamforming method considers a cost function of SIR criteria which is solved by a simplex downhill optimization method. The computer simulation showed that the proposed method gives seamless performance in time-varying channels.
Keywords :
array signal processing; cellular radio; code division multiple access; optimisation; signal detection; spread spectrum communication; telecommunication traffic; time-varying channels; DS-CDMA systems; DS/CDMA systems; SIR; cellular communication systems; coherent detection; common pilot channel; cost function; downlink beamforming method; phase mismatch; pilot signals; simplex downhill optimization method; time-varying channels; traffic channel; traffic signals; Antenna arrays; Array signal processing; Computer simulation; Degradation; Delay effects; Downlink; Interference; Multiaccess communication; Time-varying channels; Traffic control;
Conference_Titel :
Vehicular Technology Conference, 2004. VTC 2004-Spring. 2004 IEEE 59th
Print_ISBN :
0-7803-8255-2
DOI :
10.1109/VETECS.2004.1387926
