Title :
A centralized power allocation algorithm for TDD CDMA system with smart antenna in a multi-cellular environment
Author :
Li, Ji-long ; Wu, Xiao-guang ; Wang, Bing ; Deng, Gang ; Zhang, Ping
Author_Institution :
Beijing Univ. of Posts & Telecommun.
Abstract :
In TDD CDMA systems, uplink and downlink work at the same frequency, which causes interference between them. The interference in uplink and downlink connection is analyzed respectively within a time slot. Adaptive beamforming is used in uplink receiver beamforming. Beam-steering method is used to achieve downlink transmission beamforming for complexity in downlink. From the beamforming gain and path gain between transmitter and receiver, a normalized gain matrix is constructed. With this matrix we propose an optimum power allocation method that satisfies all users´ SIR requirements at the minimum transmission power. The power allocation algorithm provides an estimate of the optimum performance of all power control schemes
Keywords :
adaptive antenna arrays; array signal processing; beam steering; cellular radio; code division multiple access; power control; radio links; radiofrequency interference; telecommunication control; time division multiplexing; TDD CDMA system; adaptive beamforming; beam-steering method; code division multiple access; downlink transmission beamforming; multicellular environment; optimum power allocation method; power control scheme; smart antenna; time division duplex; uplink interference; Antenna arrays; Array signal processing; Base stations; Downlink; Frequency; Interference; Multiaccess communication; Performance gain; Receiving antennas; Transmitters; Power allocation; TDD CDMA; smart antenna;
Conference_Titel :
Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, 2005. MAPE 2005. IEEE International Symposium on
Conference_Location :
Beijing
Print_ISBN :
0-7803-9128-4
DOI :
10.1109/MAPE.2005.1618158
