A family of multiuser decision-feedback detectors for asynchronous code-division multiple-access channels
A family of multiuser decision-feedback detectors for asynchronous code-division multiple-access channels
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DOI：
10.1109/26.380060
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发表时间：
1995-02
期刊：
影响因子：
--
通讯作者：
A. Duel-Hallen
中科院分区：
文献类型：
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作者：
A. Duel-Hallen
摘要针对传统匹配滤波接收机误码率高，且最优检测器过于复杂的问题，确定简单可靠的CDMA信道抗干扰方法显得尤为重要。介绍了用于异步CDMA信道的决策反馈检测器和部分反馈检测器。研究了第二阶段带决策反馈的两级检测器。决策反馈检测器的推导基于谱分解，从而得到白噪声信道模型。我们还描述了该模型的最大似然检测器的两种实现。对几种异步CDMA信道进行了与传统检测器和线性去相关检测器的比较。在这些例子中，探索了高带宽效率系统，用户能量变化形式相似或差异很大。我们发现决策反馈检测器优于更复杂的两阶段方法，并在不同的信道条件下保持良好的性能。>
It is important to identify simple and reliable interference rejection methods for code-division multiple-access (CDMA) channels, since the conventional matched filter receiver has high error rates, and the optimal detector is too complex. We introduce decision-feedback and partial feedback detectors for asynchronous CDMA channels. Two-stage detectors with decision-feedback in the second stage are also studied. The derivation of the decision-feedback detector is based on spectral factorization which leads to a white-noise channel model. We also describe two implementations of the maximum-likelihood detector for this model. Comparisons among the proposed detectors, the conventional detector, and the linear decorrelating detector are undertaken for several asynchronous CDMA channels. In these examples, high bandwidth efficiency systems are explored, and user energies are varied form being similar to being very different. We find that decision-feedback detectors compare favorably with more complex two-stage methods and maintain good performance under diverse channel conditions. >