標題: Iterative Inter-Cell Interference Cancellation Receiver for LDPC-Coded MIMO Systems
作者: Sun, Wei-Cheng
Chen, Yan-Tong
Yang, Chia-Hsiang
Ueng, Yeong-Luh
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
關鍵字: Inter-cell interference (ICI) cancellation;multiple-input multiple-output (MIMO);low-density parity-check (LDPC) code;digital CMOS integrated circuits
公開日期: 15-Mar-2019
摘要: In an ultra-dense cellular system, users at the cell-edge are susceptible to inter-cell interference (ICI) because of the overlap of the spectrum. To combat ICI, this paper investigates two iterative ICI cancellation approaches for low-density parity-check-coded multiple-input multiple-output systems. One approach includes separate signal and interference detectors; the other one employs a joint detector for both the desired signal and interference. The joint-detector approach achieves a comparable error-rate performance with only half the computational complexity when compared to the separate-detector counterpart. An iterative ICI cancellation receiver using the joint detector is proposed and implemented. Its hardware efficiency is significantly enhanced by leveraging an efficient coordinate rotation digital computer based processing array, an adaptive input-range scaling scheme, and an area-efficient log-likelihood ratio calculator. The iterative ICI cancellation receiver is flexible enough to support multiple modulations of up to 256-QAM. The maximum gross throughput is 1.24 Gb/s for a 4x4 256-QAM configuration in a 40-nm CMOS technology. The proposed iterative receiver outperforms the current state-of-the-art works in both the throughput-to-area ratio and the normalized energy metrics, despite the added ICI capability.
URI: http://dx.doi.org/10.1109/TSP.2019.2894776
http://hdl.handle.net/11536/148848
ISSN: 1053-587X
DOI: 10.1109/TSP.2019.2894776
期刊: IEEE TRANSACTIONS ON SIGNAL PROCESSING
Volume: 67
起始頁: 1636
結束頁: 1647
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