期刊
ELECTRONICS
卷 11, 期 22, 页码 -出版社
MDPI
DOI: 10.3390/electronics11223806
关键词
massive MIMO; linear MMSE; signal detection; iterative methods; low-complexity
资金
- National Natural Science Foundation of China [62101250]
- Natural Science Foundation of Jiangsu Province [BK20210281]
- Jiangsu Key Research and Development Project [BE2020101]
- National Key Research and Development Project Grant [2020YFB1807602]
- National science foundation of China [61971217, 61971218, 61631020, 61601167]
- Jiangsu NSF [BK20200444]
- Jiangsu Planned Projects for Postdoctoral Research Funds [2020Z013]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX21_0215]
- China Postdoctoral Science Foundation [2020M681585]
This paper addresses the challenge of signal detection in uplink massive MIMO systems and proposes an improved Gauss-Seidel iteration algorithm to enhance detection performance and reduce computational load.
Signal detection is a serious challenge for uplink massive multiple-input multiple-output (MIMO) systems. The traditional linear minimum-mean-squared error (MMSE) achieves good detection performance for such systems, but involves matrix inversion, which is computationally expensive due to a large number of antennas. Thus, several iterative methods such as Gauss-Seidel (GS) have been studied to avoid the direct matrix inversion required in the MMSE. In this paper, we improve the GS iteration in order to enhance the detection performance of massive MIMO systems with a large loading factor. By exploiting the property of massive MIMO systems, we introduce a novel initialization strategy to render a quick start for the proposed algorithm. While maintaining the same accuracy of the designed detector, the computing load is further reduced by initialization approximation. In addition, an effective preconditioner is proposed that efficiently transforms the original GS iteration into a new one that has the same solution, but a faster convergence rate than that of the original GS. Numerical results show that the proposed algorithm is superior in terms of complexity and performance than state-of-the-art detectors. Moreover, it exhibits identical error performance to that of the linear MMSE with one-order-less complexity.
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