Error Vector Magnitude-Based Low Complexity Adaptive Power Allocation in SM-MIMO System

• Published in: IEEE systems journal Vol. 16; no. 4; pp. 6164 - 6174
• Main Authors: Mohamed, Abeer, Bai, Zhiquan, Guo, Jianing, Pang, Ke, Femi-Philips, Oloruntomilayo, Paul, Twarayisenze Jean, Hao, Xinhong
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.12.2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Adaptive power allocation (PA); Algorithms; Antennas; Bit error rate; Complexity; Computational complexity; error vector magnitude (EVM); Errors; Euclidean distance (ED); Euclidean geometry; MIMO communication; Modulation; Optimization; Precoding; Quadrature amplitude modulation; quadrature amplitude modulation (QAM); Receiving antennas; Signal to noise ratio; spatial modulation multiple-input multiple-output (SM-MIMO); Transmitting antennas
• ISSN: 1932-8184; 1937-9234
• DOI: 10.1109/JSYST.2022.3149868

In this article, we propose the error vector magnitude (EVM)-based adaptive power allocation (PA) for spatial modulation (SM) multiple-input-multiple-output (MIMO) system to optimize the minimum squared Euclidean distance and reduce the system complexity. We first investigate the typical Euclidean distance (ED)-based PA (ED-PA) algorithm. Second, an EVM-based ED-PA algorithm is proposed, where a simplified closed-form PA solution for the quadrature amplitude modulation is obtained in the case of two transmit antennas. For more transmit antennas, we further propose a low complexity-PA (LC-PA) algorithm, where all the transmit antennas are grouped with two antennas in each group and the proposed EVM-based ED-PA algorithm is utilized to assign the power within each group. Numerical results reveal that the proposed EVM-based ED-PA and LC-PA algorithms have considerably lower complexity and can achieve the optimal average bit error rate (ABER) and suboptimal ABER performance at low-and-moderate signal-to-noise ratio (SNR) region and high-SNR region, respectively, compared with the typical PA algorithms in SM-MIMO system.