Performance of Turbo-Coded OFCDM Systems with Soft MCI Cancellation

Zhou, Yiqing and Wang, Jiangzhou (2006) Performance of Turbo-Coded OFCDM Systems with Soft MCI Cancellation. In: Communications, 2006. ICC '06. IEEE International Conference on. IEEE pp. 1766-1771. ISBN 1-4244-0355-3. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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This paper investigates the performance of turbo-coded orthogonal frequency and code division multiplexing (OFCDM) systems with soft multi-code interference (MCI) cancellation. In order to regenerate the soft interference signal, the conventional turbo decoding algorithm must be modified to provide log likelihood ratio (LLR) values for all coded bits. Based on the LLR outputs of turbo decoder, two soft decision functions are proposed, i.e., LLR-soft-decision and Gaussian-soft-decision functions. By means of computer simulations, it is shown that in a highly frequency selective channel, soft MCI cancellation and MMSE detection can significantly improve the performance of turbo-coded OFCDM systems. Two iterations in turbo decoding are sufficient for both hard and soft decision functions. The proposed soft decision functions outperform the hard decision function with various channel conditions and system parameters.

Item Type: Conference or workshop item (Paper)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101 Telecommunications
Divisions: Faculties > Science Technology and Medical Studies > School of Engineering and Digital Arts > Broadband & Wireless Communications
Depositing User: Yiqing Liang
Date Deposited: 12 Aug 2009 11:14
Last Modified: 30 Apr 2014 15:06
Resource URI: (The current URI for this page, for reference purposes)
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