Title :
A downlink beam selection scheme with feedback in CDMA/FDD systems
Author :
Kihira, Kazunari ; Hara, Yoshitaka ; Sekiguchi, Takashi
Author_Institution :
Inf. Technol. R&D Center, Mitsubishi Electr. Corp., Kanagawa, Japan
Abstract :
The paper presents a downlink beam selection scheme with feedback in CDMA/FDD systems. At the base station, multiple beams are formed in a sector. Orthogonal symbol sequences are used to distinguish each beam and are transmitted as common pilot channels. The mobile station selects the beam that achieves the maximum signal-to-interference-plus-noise ratio (SINR). In the next slot, the base station transmits the data symbols by using the selected beam. Simulation results show that the proposed scheme performs better than transmit beamforming using the uplink signals under a large angular spread condition.
Keywords :
3G mobile communication; cellular radio; code division multiple access; feedback; frequency division multiplexing; spread spectrum communication; time-varying channels; CDMA/FDD systems; DS-CDMA; IMT-2000; common pilot channels; downlink beam selection scheme; feedback; large angular spread; maximum SINR; maximum signal-to-interference-plus-noise ratio; mobile station; multiple beams; orthogonal symbol sequences; third-generation mobile communication systems; time-varying channels; transmit beamforming; Array signal processing; Base stations; Communication system control; Downlink; Feedback; Feeds; Mobile communication; Multiaccess communication; Multiple access interference; Signal to noise ratio;
Conference_Titel :
Vehicular Technology Conference, 2003. VTC 2003-Fall. 2003 IEEE 58th
Print_ISBN :
0-7803-7954-3
DOI :
10.1109/VETECF.2003.1285010
