期刊
IEEE TRANSACTIONS ON SIGNAL PROCESSING
卷 66, 期 13, 页码 3393-3406出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TSP.2018.2831628
关键词
Massive MIMO; mmWave; array signal processing; wideband; spatial-wideband; beam squint; angle reciprocity; delay reciprocity
资金
- National Natural Science Foundation of China [61771274, 61531011]
- Beijing Natural Science Foundation [4182030]
- JSPS KAKENHI [17K06435]
- Grants-in-Aid for Scientific Research [17K06435] Funding Source: KAKEN
When there are a large number of antennas in massive MIMO systems, the transmitted wideband signal will be sensitive to the physical propagation delay of electromagnetic waves across the large array aperture, which is called the spatial-wideband effect. In this scenario, the transceiver design is different from most of the existing works, which presume that the bandwidth of the transmitted signals is not that wide, ignore the spatial-wideband effect, and only address the frequency selectivity. In this paper, we investigate spatial-and frequency-wideband effects, called dual-wideband effects in massive MIMO systems from the array signal processing point of view. Taking millimeter-wave-band communications as an example, we describe the transmission process to address the dual-wideband effects. By exploiting the channel sparsity in the angle domain and the delay domain, we develop the efficient uplink and downlink channel estimation strategies that require much less amount of training overhead and cause no pilot contamination. Thanks to the array signal processing techniques, the proposed channel estimation is suitable for both TDD and FDD massive MIMO systems. Numerical examples demonstrate that the proposed transmission design for massive MIMO systems can effectively deal with the dual-wideband effects.
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