Title :
Capacity comparison of single-tone and multitone CDMA systems
Author :
Zhang, Xi ; Ng, Tung-Sang ; Wang, Jiangzhou
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ., Hong Kong
Abstract :
Performance of multitone-CDMA communications over multipath fading channels with coherent RAKE reception is studied. A random-delay, two-path, Rayleigh-fading channel model is considered. Bit error probability for maximal ratio combining is derived. Analytical results show that the multiple-access capacity of a multitone-CDMA system, under conditions of equal bandwidth and equal bit transmission rate, is identical to that of a single-tone direct-sequence spread-spectrum system. It indicates that using more subcarriers to increase the processing gain does not achieve a larger capacity
Keywords :
Rayleigh channels; code division multiple access; diversity reception; error statistics; land mobile radio; multipath channels; bit error probability; capacity comparison; coherent RAKE reception; maximal ratio combining; multipath fading channels; multiple-access capacity; multitone CDMA systems; processing gain; random-delay two-path Rayleigh-fading channel model; single-tone CDMA systems; subcarriers; AWGN channels; Bandwidth; Diversity reception; Error probability; Fading; Multiaccess communication; Multiple access interference; Radio transmitters; Rayleigh channels; Spread spectrum communication;
Conference_Titel :
Vehicular Technology Conference, 1999. VTC 1999 - Fall. IEEE VTS 50th
Conference_Location :
Amsterdam
Print_ISBN :
0-7803-5435-4
DOI :
10.1109/VETECF.1999.797132
