Downlink Transmission of Broadband OFCDM Systems - Part III: Turbo-Coded

Zhou, Yiqing and Wang, Jiangzhou and Sawahashi, Mamoru (2006) Downlink Transmission of Broadband OFCDM Systems - Part III: Turbo-Coded. IEEE Journal on Selected Areas in Communications, 24 (1). pp. 132-140. ISSN 0733-8716. (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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Orthogonal frequency and code-division multiplexing (OFCDM) systems have been introduced for high-speed data transmission in future wireless mobile communications. In this paper, a hybrid multicode interference cancellation (MCI) and minimum mean-square error (MMSE) detection scheme is presented for the turbo-coded OFCDM systems. Channel estimation based on a code-multiplexed pilot channel is employed. The weights of the hybrid detection are derived theoretically and an effective method to generate the weights in practical applications is proposed. By means of computer simulation, the effects of system parameters on the performance are studied extensively. It is shown that the hybrid detection outperforms pure MMSE detection in various channel conditions, especially for high-level modulation schemes. To carry out interference regeneration for the hybrid detection, the conventional turbo decoding algorithm which only decodes systematic bits should be extended to decode parity bits as well. Moreover, two iterations in turbo decoding are sufficient to provide good performance for the system with the multistage hybrid detection. Finally, given time-domain spreading factor N-T, the system performance improves with frequency-domain spreading factor N-F. However, the frequency diversity gain is saturated when N-F is large (i.e., N-F >= 16).

Item Type: Article
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 Sep 2008 07:34
Last Modified: 17 Jul 2014 13:05
Resource URI: (The current URI for this page, for reference purposes)
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