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On combining SDMA and B-IFDMA: Multi-user detection and channel estimation

机译:关于结合SDMA和B-IFDMA:多用户检测和信道估计

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In this paper, we combine two different multiple access, namely, Space Division Multiple Access (SDMA) and Block-Interleaved Division Multiple Access (B-IFDMA), for uplink transmission, and we name the combined multiple access SD/B-IFDMA. Since SDMA suffers from multiple access interference (MAI) and B-IFDMA from intersymbol interference (ISI), a multi-user detector that can counteract both MAI and ISI is needed for SD/B-IFDMA. We propose three low complexity linear multi-user detectors for SD/B-IFDMA, namely, Zero Forcing (ZF), Minimum Mean Square Error (MMSE) and Non-Iterative Constrained Least Squares (NICLS). The NICLS is a heuristic multi-user detector that tries to improve the performance of ZF without the necessity of having to estimate the noise variance. Additionally, we also address the channel estimation procedure for SD/B-IFDMA by applying orthogonal time multiplexing training and using Chu sequence as the training sequence. Two estimators are considered for channel estimation for SD/B-IFDMA, namely, frequency domain Least Squares (LS) and time domain low complexity Maximum Likelihood (lcML). From bit error performance, it is shown that the MMSE multiuser detector performs best followed by NICLS and ZF. For performance assessment of the channel estimators, ZF multiuser detection is used. It is shown that the lcML outperforms LS with the penalty of having higher computational complexity.
机译:在本文中,我们结合了两种不同的多址访问,即空分多址(SDMA)和块交错分多址(B-IFDMA),用于上行链路传输,并命名了组合的多址SD / B-IFDMA。由于SDMA遭受多址干扰(MAI),B-IFDMA受到符号间干扰(ISI),因此SD / B-IFDMA需要一个能够抵消MAI和ISI的多用户检测器。我们为SD / B-IFDMA提出了三种低复杂度的线性多用户检测器,分别是零强迫(ZF),最小均方误差(MMSE)和非迭代约束最小二乘(NICLS)。 NICLS是一种启发式多用户检测器,它试图提高ZF的性能,而不必估计噪声方差。此外,我们还通过应用正交时分复用训练并使用Chu序列作为训练序列来解决SD / B-IFDMA的信道估计过程。对于SD / B-IFDMA的信道估计,考虑了两个估计器,即频域最小二乘(LS)和时域低复杂度最大似然(lcML)。从误码性能来看,表明MMSE多用户检测器的性能最佳,其次是NICLS和ZF。为了评估信道估计器的性能,使用了ZF多用户检测。结果表明,lcML的性能优于LS,但运算复杂度较高。

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