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

Volume

3

fYear

1997

fDate

3-8 Nov 1997

Firstpage

1548

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 1997. GLOBECOM '97., IEEE

Conference_Location

Phoenix, AZ

Print_ISBN

0-7803-4198-8

Type

conf

DOI

10.1109/GLOCOM.1997.644394

Filename

644394