標題: Gridless Channel Estimation for Mixed One-Bit Antenna Array Systems
作者: Wang, Chang-Jen
Wen, Chao-Kai
Jin, Shi
Tsai, Shang-Ho
電子工程學系及電子研究所
電控工程研究所
Department of Electronics Engineering and Institute of Electronics
Institute of Electrical and Control Engineering
關鍵字: Channel estimation;gridless;large-scale antenna array system;one-bit ADC;mixed-ADC architecture;compressive sensing
公開日期: 1-Dec-2018
摘要: A receiver architecture with low-resolution analogto-digital converters (ADCs) coupled with large antenna arrays has drawn considerable interest in the millimeter wave (mm-wave) system. Although architecture with pure one-bit ADCs has low power cost, such a system presents many challenges for synchronization, channel estimation, and power level estimation. Research has been conducted recently on the so-called mixed one-bit system, in which most antennas are equipped with one-bit ADCs, and a few have high-resolution ADCs. Despite the advantages of this system, studies on how to efficiently use high-resolution outputs to aid the one-bit system are lacking. This research considers the channel estimation problem to fill this gap and proposes a two-step channel estimator by utilizing the different features of mixed outputs. The channel gain can he extracted from high-resolution ADCs, and the channel angle can be extracted by the combination of additional one-bit ADCs. The proposed estimator leverages the sparsity feature of the channel in mm-wave. In contrast to previous works that used compressive sensing techniques, which confine the estimate to the set of grid angle points and induce estimation bias, the proposed estimator is gridless and treats the angle as a continuous parameter. The simulation results demonstrate that the proposed method yields significantly lower mean square errors than the conventional maximum likelihood estimator. In addition, this paper investigates ways to further improve the channel estimate by arranging the locations of high-resolution ADCs. Several useful observations on system design are obtained through our analysis.
URI: http://dx.doi.org/10.1109/TWC.2018.2877757
http://hdl.handle.net/11536/148583
ISSN: 1536-1276
DOI: 10.1109/TWC.2018.2877757
期刊: IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
Volume: 17
起始頁: 8485
結束頁: 8501
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