On the complexity reduction of turbo decoding for wideband CDMA

Author

Ma, Zheng ; Mow, Wai Ho ; Fan, Pingzhi

Author_Institution

Inst. of Mobile Commun., Southwest Jiaotong Univ., Sichuan, China

Volume

4

Issue

2

fYear

2005

fDate

3/1/2005 12:00:00 AM

Firstpage

353

Lastpage

356

Abstract

Two simple but effective methods for reducing the average complexity (and power consumption) of the conventional turbo-cyclic-redundancy-check decoding scheme with negligible performance degradation in a wideband direct-sequence code-division multiple-access (W-CDMA) environment are introduced. When applied to a W-CDMA turbo code with frame length 640 b at a bit-error rate (BER) of 10^-6, the resultant modified schemes can save up to 73% of the average decoding complexity, relative to the conventional scheme. In general, the proposed schemes are more attractive for short-frame and low-BER applications.

Keywords

broadband networks; code division multiple access; computational complexity; cyclic redundancy check codes; error statistics; iterative decoding; spread spectrum communication; turbo codes; BER; bit-error rate; complexity reduction; direct-sequence code-division multiple-access; iteration method; power consumption; stopping criteria; turbo-cyclic-redundancy-check decoding scheme; wideband CDMA; Bit error rate; Cyclic redundancy check; Degradation; Delay; Energy consumption; Iterative decoding; Mobile communication; Multiaccess communication; Turbo codes; Wideband; Cyclic redundancy check (CRC); iteration; stopping criteria; turbo decoding; wideband direct-sequence code-division multiple-access (W-CDMA);

fLanguage

English

Journal_Title

Wireless Communications, IEEE Transactions on

Publisher

ieee

ISSN

1536-1276

Type

jour

DOI

10.1109/TWC.2004.843050

Filename

1413198