Tradeoff of channel coding and repetition-code spreading in IDMA systems

Author

Yan, Yang ; Zhou, Shidong ; Xiao, Limin ; Su, Xin ; Wang, Jing ; Xu, Xibin

Author_Institution

State Key Laboratory on Microwave and Digital Communications Tsinghua National Laboratory for Information Science and Technology Department of Electronic Engineering, Tsinghua University, Beijing 100084, P.R. China

fYear

2009

fDate

7-9 Dec. 2009

Firstpage

496

Lastpage

499

Abstract

This paper presents a novel tradeoff of channel coding and repetition-code spreading in IDMA systems which is generalized from traditional DS-CDMA systems. With the help of separation result of coding and spreading given by Veeravalli, we solve the coding-spreading tradeoff problem in the way of concatenating channel coding followed by spreading. In particular, we take two kinds of channel coding, i.e. feed-forward convolutional code and turbo code into consideration in this tradeoff problem. A low-complexity soft rake serial interference cancellation-aided turbo-type multiuser detection is utilized over AWGN channels. Theoretical analysis and Monte Carlo simulations both reveal that under a preset bandwidth expansion, the tradeoff problem favours channel coding over repetition-code spreading in enhancing the system spectral efficiency.

Keywords

IDMA; channel coding; spectral efficiency; spreading; turbo-type multiuser detection (MUD);

fLanguage

English

Publisher

iet

Conference_Titel

Wireless Mobile and Computing (CCWMC 2009), IET International Communication Conference on

Conference_Location

Shanghai, China

Type

conf

Filename

5521965