A turbo coded DS/CDMA system with embedded Walsh-Hadamard codewords: coder design and performance evaluation

1988 IEEE 5th International Symposium on Spread Spectrum Techniques and Applications - Proceedings. Spread Technology to Africa (Cat. No.98TH8333) Pub Date : 1998-09-02 DOI:10.1109/ISSSTA.1998.723806

D.J. van Wykt, L. Linde

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引用次数: 2

Abstract

This paper presents the design of a turbo encoding scheme with embedded Walsh-Hadamard (WH) codewords, and a suitable decoder structure based on an iterative decoding technique, akin to the work on "superorthogonal" turbo codes presented by Pehkonen and Komulainen (see ISSSTA'96: International Symposium on Spread Spectrum Techniques & Applications, Mainz, Germany, p.580-4, 1995). The main contribution of this paper is a detailed design of the turbo decoder structure required to perform the required decoding steps, omitted by Pehkonen et al. The performance of the proposed iterative turbo coded DS/CDMA receiver is then studied in an mobile radio environment. Attention is focused on an 8-state rate 2/64 coded QPSK DS/CDMA system, in agreement with the rate offered by the IS-95 coding scheme. The bit error rate performance of the proposed coding scheme is evaluated by means of simulation and compared to that of a DS/CDMA system employing the IS-95 front-end coder for the reverse link channel.

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嵌入Walsh-Hadamard码字的turbo编码DS/CDMA系统:编码器设计与性能评估

本文提出了一种嵌入Walsh-Hadamard (WH)码字的turbo编码方案的设计，以及一种基于迭代解码技术的合适的解码器结构，类似于Pehkonen和Komulainen提出的“超正交”turbo码的工作(参见ISSSTA'96:扩频技术与应用国际研讨会，德国美因茨，p.580- 4,1995)。本文的主要贡献是详细设计了执行所需解码步骤所需的涡轮解码器结构，Pehkonen等人省略了这一点。然后在移动无线电环境中研究了所提出的迭代涡轮编码DS/CDMA接收机的性能。注意力集中在8状态速率2/64编码的QPSK DS/CDMA系统上，与is -95编码方案提供的速率一致。通过仿真评估了该编码方案的误码率性能，并与采用is -95前端编码器的DS/CDMA系统的误码率性能进行了比较。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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1988 IEEE 5th International Symposium on Spread Spectrum Techniques and Applications - Proceedings. Spread Technology to Africa (Cat. No.98TH8333)

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