Performance Improvement of FH CDMA Signals using Rate Compatible Parallel Concatenated Block Codes

2007 International Conference on Signal Processing, Communications and Networking Pub Date : 2007-11-05 DOI:10.1109/ICSCN.2007.350705

K. Sudha, R. Rao

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引用次数: 1

Abstract

Frequency-hopped (FH) CDMA is a digital multiple access system in which individual users selects one of Q frequencies within a wideband channel as carrier frequency. Main drawback of FH CDMA is, it is interference limited. In this paper we analyze the performance of frequency-hopped spread spectrum networks (FHSS) with turbo block codes. After the development of turbo code, using block component codes have received less attention. Block component codes are particularly suited for high rate applications with short block lengths and allow high degree of parallel processing which is desirable for delay sensitive applications. Rate compatible coding is appropriate for communication systems that experience a range of operating SNRs but seek to adhere to a single under laying codec structure. This paper suggests the performance improvement of FH SS signals by using rate compatible parallel-concatenated block codes using BCH (Bose, Chaudhuri, Hocquenghem) codes as component codes and usage of puncturing for making it rate compatible. These codes enjoy more freedom in puncturing pattern selection thus allowing for an almost continuous spectrum of code rates

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用速率兼容并行串接分组码改进跳频CDMA信号的性能

跳频(FH) CDMA是一种数字多址系统，用户在宽带信道中选择Q个频率中的一个作为载波频率。跳频CDMA的主要缺点是受干扰的限制。本文分析了带turbo分组码的跳频扩频网络的性能。在turbo码发展之后，使用块组件码已经很少受到重视。块组件代码特别适合于具有短块长度的高速率应用，并允许高度并行处理，这是延迟敏感应用所需要的。速率兼容编码适用于经历一系列操作信噪比的通信系统，但寻求坚持单一的底层编解码器结构。本文提出了采用BCH (Bose, Chaudhuri, Hocquenghem)码作为分量码，并采用穿刺使其速率兼容的方法来提高跳频SS信号的性能。这些代码在穿刺模式选择方面享有更多的自由，从而允许几乎连续的码率频谱

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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2007 International Conference on Signal Processing, Communications and Networking

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