期刊
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
卷 72, 期 1, 页码 1349-1354出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TVT.2022.3206492
关键词
Antenna arrays; Signal processing algorithms; Radio frequency; Millimeter wave communication; Uplink; Internet of Things; Millimeter wave technology; Active user detection; channel estimation; massive IoT access; millimeter-wave; multi-panel mMIMO; terahertz
This paper investigates a joint active user detection (AUD) and channel estimation (CE) scheme based on compressive sensing (CS) for millimeter-wave (mmWave)/terahertz (THz) systems in the context of non-uniform array structures. By exploiting the structured sparsity of mmWave/THz massive IoT access channels, the authors formulate the problem as a multiple measurement vector (MMV)-CS problem and develop an orthogonal approximate message passing (OAMP)-EM-MMV algorithm to solve it. Simulation results show the improved performance of the proposed scheme compared to conventional CS-based algorithms.
The multi-panel array, as a state-of-the-art antenna-in-package technology, is very suitable for millimeter-wave (mmWave)/ terahertz (THz) systems, due to its low-cost deployment and scalable configuration. But in the context of non-uniform array structures it leads to intractable signal processing. Based on such an array structure at the base station, this paper investigates a joint active user detection (AUD) and channel estimation (CE) scheme based on compressive sensing (CS) for application to the massive Internet of Things (IoT). Specifically, by exploiting the structured sparsity of mmWave/THz massive IoT access channels, we firstly formulate the multi-panel massive multiple-input multiple-output (mMIMO)-based joint AUD and CE problem as a multiple measurement vector (MMV)-CS problem. Then, we harness the expectation maximization (EM) algorithm to learn the prior parameters (i.e., the noise variance and the sparsity ratio) and an orthogonal approximate message passing (OAMP)-EM-MMV algorithm is developed to solve this problem. Our simulation results verify the improved AUD and CE performance of the proposed scheme compared to conventional CS-based algorithms.
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