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首页> 外文期刊>Vehicular Technology, IEEE Transactions on >Space-Time Adaptive MMSE Multiuser Decision Feedback Detectors With Multiple-Feedback Interference Cancellation for CDMA Systems
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Space-Time Adaptive MMSE Multiuser Decision Feedback Detectors With Multiple-Feedback Interference Cancellation for CDMA Systems

机译：具有多反馈干扰消除功能的CDMA系统时空自适应MMSE多用户决策反馈检测器

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摘要

In this paper, we propose a novel space-time minimum mean square error (MMSE) decision feedback (DF) detection scheme for direct-sequence code-division multiple access (DS-CDMA) systems with multiple receive antennas, which employs multiple-parallel-feedback (MPF) branches for interference cancellation. The proposed space-time receiver is then further combined with cascaded DF stages to mitigate the deleterious effects of error propagation for uncoded schemes. To adjust the parameters of the receiver, we also present modified adaptive stochastic gradient (SG) and recursive least squares (RLS) algorithms that automatically switch to the best-available interference cancellation feedback branch and jointly estimate the feedforward and feedback filters. The performance of the system with beamforming and diversity configurations is also considered. Simulation results for an uplink scenario with uncoded systems show that the proposed space-time MPF-DF detector outperforms existing schemes such as linear, parallel DF (P-DF), and successive DF (S-DF) receivers in terms of bit error rate (BER) and achieves a substantial capacity increase in terms of the number of users, compared with the existing schemes. We also derive the expressions for MMSE achieved by the analyzed DF structures, including the novel scheme, with imperfect and perfect feedback and expressions of signal-to-interference-plus-noise ratio (SINR) for the beamforming and diversity configurations with linear receivers.
机译：在本文中，我们针对具有多个接收天线的直接序列码分多址（DS-CDMA）系统提出了一种新颖的时空最小均方误差（MMSE）决策反馈（DF）检测方案。 -feedback（MPF）分支用于消除干扰。然后，将所提出的时空接收机进一步与级联DF级组合，以减轻未编码方案错误传播的有害影响。为了调整接收机的参数，我们还提出了改进的自适应随机梯度（SG）和递归最小二乘（RLS）算法，这些算法会自动切换到最佳可用干扰消除反馈分支，并共同估算前馈和反馈滤波器。还考虑了具有波束成形和分集配置的系统的性能。在未编码系统的上行链路情况下的仿真结果表明，所提出的时空MPF-DF检测器在误码率方面优于线性，并行DF（P-DF）和连续DF（S-DF）接收器等现有方案。 （BER），并且与现有方案相比，在用户数量方面实现了可观的容量增长。我们还推导了通过分析的DF结构（包括新颖的方案）获得的MMSE的表达式，该表达式具有不完美和完美的反馈，以及具有线性接收器的波束成形和分集配置的信噪比与信噪比（SINR）的表达式。

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