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首页> 外文期刊>IEEE Transactions on Communications >Iterative implementation of linear multiuser detection for dynamic asynchronous CDMA systems
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Iterative implementation of linear multiuser detection for dynamic asynchronous CDMA systems

机译:动态异步CDMA系统中线性多用户检测的迭代实现

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摘要

Several linear multiuser detectors for code-division multiple access (CDMA) systems can be characterized as an inverse of some form of correlation matrices. If the correlations change, the detectors must be redesigned. An ideal computation of the decorrelating or the linear minimum mean-squared-error (LMMSE) detector requires order K/sup 3/ flops, where K is the number of users. To alleviate the computational complexity, iterative decorrelating and LMMSE detectors are proposed. The iterative detectors use steepest descent (SD), conjugate gradient (CG), and preconditioned conjugate gradient (PCG) algorithms, and require order K/sup 2/ flops per iteration. Their main advantages are the reduced number of flops and their suitability to highly parallel implementations. The correlation coefficient computation can also be embedded into the CG algorithm, which is an advantage with time-varying signature waveforms. The performance of the iterative algorithms is studied via computer simulations.
机译:用于码分多址(CDMA)系统的几种线性多用户检测器可以表征为某种形式的相关矩阵的逆。如果相关性发生变化,则必须重新设计检测器。解相关或线性最小均方误差(LMMSE)检测器的理想计算需要K / sup 3 / flop阶,其中K是用户数。为了减轻计算复杂度,提出了迭代解相关和LMMSE检测器。迭代检测器使用最速下降(SD),共轭梯度(CG)和预处理共轭梯度(PCG)算法,并且每次迭代需要阶跃K / sup 2 /触发器。它们的主要优点是减少了触发器的数量,并且适合于高度并行的实现。相关系数计算也可以嵌入到CG算法中,这对于时变签名波形是一个优势。通过计算机仿真研究了迭代算法的性能。

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