Title :
A near optimal subchannel allocation policy in forward links for multicarrier CDMA system
Author :
Fan, Pingyi ; Li, Jianjun ; Cao, Zhigang
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
In this paper a new model of a multicarrier (MC) CDMA system is proposed with forward links transmission for a cellular network. In the proposed system, the user estimates all subchannels´ fading amplitude and feeds back all indices of its interested subchannels where the fading amplitudes are higher than a pre-fixed threshold to the basestation to guarantee the quality of service. With the indices information, the basestation transmits each user´s direct-sequence (DS) waveform over one of its interested subchannels. Based on the criterion of maximizing the total average signal to interference plus noise ratio (SINR), a near optimal subchannel allocation policy is proposed and one iterative algorithm for its implementation is obtained. Simulation results show that the average performance in the proposed system can be improved compared with that only using the favorite subchannel for each user in Kim et al. (1999) when random signature sequences are used
Keywords :
cellular radio; channel allocation; code division multiple access; iterative methods; quality of service; SINR; amplitude; basestation; cellular network; direct sequence waveform; forward links; interested subchannels; iterative algorithm; multicarrier CDMA system; near optimal subchannel allocation policy; quality of service; Bandwidth; Fading; Frequency; Interference; Iterative algorithms; Multiaccess communication; Multicarrier code division multiple access; Quality of service; Rayleigh channels; Signal to noise ratio;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd
Conference_Location :
Rhodes
Print_ISBN :
0-7803-6728-6
DOI :
10.1109/VETECS.2001.944508
