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Adaptive single-user receivers for direct-sequence spread-spectrum CDMA systems

机译：直接序列扩频CDMA系统的自适应单用户接收器

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摘要

The capacity of a direct-sequence spread-spectrum code-division multiple-access (DSSS-CDMA) system is limited by multiple-access interference (MAI) and the near-far problem. Multiuser receivers provide a solution to these problems, but they require knowledge of parameters of the MAI and are computationally complex. Adaptive single-user receivers, however, do not require knowledge of MAI parameters and need fewer computations. This paper discusses a wide range of adaptive single-user receivers found in the literature and presents their performance results under a unified framework to provide a basis of comparison. Results indicate that, compared to the conventional receiver, adaptive single-user receivers provide large gains in system capacity and are near-far resistant. It is shown that fractionally spaced adaptive receivers, which exploit spectral correlation due to the cyclostationary nature of the DSSS signal, perform better than adaptive receivers that cannot exploit this correlation. Multipath results presented for two-ray and urban channels indicate that fractionally spaced adaptive receivers act as RAKE receivers.
机译：直接序列扩频码分多址（DSSS-CDMA）系统的容量受到多址干扰（MAI）和远距离问题的限制。多用户接收机为这些问题提供了解决方案，但是它们需要MAI参数的知识并且计算复杂。但是，自适应单用户接收器不需要MAI参数的知识，并且需要较少的计算。本文讨论了文献中发现的各种自适应单用户接收器，并在统一框架下展示了它们的性能结果，以提供比较的基础。结果表明，与常规接收器相比，自适应单用户接收器在系统容量方面提供了很大的收益，并且具有远近抵抗能力。结果表明，由于DSSS信号的循环平稳特性，利用频谱相关性的小间隔自适应接收机的性能优于不能利用这种相关性的自适应接收机。针对两射线和城市信道呈现的多径结果表明，分数间隔的自适应接收器充当RAKE接收器。

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