Performance of cellular SSMA with block coding under fading and multipath conditions

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI:10.1109/ISSSTA.1994.379581

P. van Rooyen, J. Kunicki, R. Pichna

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Abstract

Considers the application of channel coding to cellular DS-SSMA digital radio. The method of moments is used to accurately assess the system error probability. Using this technique, one can also assess the accuracy of assuming that the multiuser interference has a Gaussian distribution, which allows calculations to be analyzed by simpler means. It is verified that the Gaussian assumption is sufficiently accurate under the conditions considered. Cellular system performance is further investigated with voice activity monitoring and cell splitting under AWGN, Rayleigh fading and multipath conditions typical for personal and mobile communications. Block codes of relative low complexity are investigated when Gold sequences of length 255 and 127 are employed for purposes of PN spreading. The average degradation due to interuser interference is determined by employing exact aperiodic correlation parameters as defined by Pursely [1977]. Numerical results indicate that for a given processing gain and number of interfering users, appropriate coding can allow for reliable communication even under multipath fading conditions.<>

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衰落和多径条件下分组编码的蜂窝SSMA性能

研究了信道编码在蜂窝DS-SSMA数字无线电中的应用。采用矩量法准确地估计了系统的误差概率。使用这种技术，还可以评估假设多用户干扰具有高斯分布的准确性，这允许用更简单的方法分析计算。验证了高斯假设在所考虑的条件下是足够精确的。在AWGN、瑞利衰落和个人和移动通信典型的多径条件下，通过语音活动监测和小区分裂进一步研究蜂窝系统性能。研究了长度为255和127的Gold序列用于PN扩展时相对低复杂度的分组码。由用户间干扰引起的平均退化可通过使用Pursely[1977]定义的精确的非周期相关参数来确定。数值结果表明，对于给定的处理增益和干扰用户数量，适当的编码即使在多径衰落条件下也可以实现可靠的通信。

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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Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)

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