Title :
The performance of turbo-codes in asynchronous DS-CDMA
Author :
Wang, Min ; Wang, Zhen-song ; Chen, De-rong ; Lin, Jia-ru
Author_Institution :
Inst. of Electron., Acad. Sinica, Beijing, China
Abstract :
In this paper, we consider orthogonal/turbo-codes for mobile asynchronous DS-CDMA communications. First, we investigate the performance of turbo-codes with perfect channel state information and without channel state information in AWGN and BSC channels. Then turbo-codes are applied to noncoherent M-ary orthogonal modulation in multipath fading channels. It is shown that due to channel memory introduced by multipath fading and multiple access interference noise, the performance of turbo-codes degraded two orders. Another result is that turbo-codes prefer hard decision to optimum hard decision which is not the case in convolutional codes
Keywords :
Gaussian channels; channel coding; code division multiple access; concatenated codes; convolutional codes; fading; mobile radio; multipath channels; AWGN channels; BSC channels; asynchronous DS-CDMA communications; channel memory; convolutional codes; hard decision; mobile communication; multipath fading channels; multiple access interference noise; noncoherent M-ary orthogonal modulation; orthogonal codes; perfect channel state information; turbo-codes; AWGN; Additive white noise; Channel state information; Degradation; Fading; Gaussian noise; Mobile communication; Multiaccess communication; Multiple access interference; Turbo codes;
Conference_Titel :
Global Telecommunications Conference, 1997. GLOBECOM '97., IEEE
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-7803-4198-8
DOI :
10.1109/GLOCOM.1997.644394
