Title :
On the multiple-access capacity of multitone-CDMA communications
Author :
Yip, Kun-wah ; Zhang, Xi ; Ng, Tung-Sang ; Wang, Jiangzhou
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ., Hong Kong
Abstract :
This paper derives a bit-error-probability expression for an asynchronous multitone-code-division multiple access (CDMA) system and shows that the multiple-access (MA) capacity of this system is identical to that of a conventional (single-carrier) direct-sequence spread-spectrum system under conditions of equal bandwidth and equal bit rate. It is also shown that using more subcarriers to increase the processing gain does not increase the MA capacity.
Keywords :
OFDM modulation; channel capacity; code division multiple access; interference suppression; multiuser channels; radiofrequency interference; spread spectrum communication; OFDM; asynchronous multitone-code-division multiple access; bandwidth; bit error probability; bit rate; direct-sequence spread-spectrum system; multiple access interference; multiple-access capacity; multitone-CDMA communications; narrowband interference suppression; orthogonal frequency division multiplexing; processing gain; single-carrier SS-SS system; subcarriers; AWGN; Bandwidth; Bit rate; Error probability; Multiaccess communication; Multiple access interference; OFDM; Signal processing; Spread spectrum communication; Transmitters;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/4234.824750
