Journal
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
Volume 16, Issue 10, Pages 6868-6880Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TWC.2017.2732405
Keywords
mmWave massive MIMO; direction of arrival (DOA); hybrid precoding; angle division multiple access (ADMA); channel tracking; Kalman filter
Funding
- National Natural Science Foundation of China [61422109, 61531011]
- National Science Foundation for Distinguished Young Scholars of China [61625106]
- JSPS KAKENHI [JP17K06435]
- Grants-in-Aid for Scientific Research [17K06435] Funding Source: KAKEN
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The millimeter-wave (mm-wave) massive multipleinput multiple-output (MIMO) system has gained much attention for its considerable improvement in system throughput. However, the cost of complex hardware, e.g., radio frequency (RF) chains, hinders it from practical deployment. In this paper, we propose an angle domain hybrid precoding and channel tracking method by exploring the spatial features of the mm-wave massive MIMO channel. The number of the effective spatial beams, or equivalently the RF chains, is enormously decreased via the operation of spatial rotation. The users are then scheduled by the angle division multiple access scheme, which groups users according to their direction of arrivals (DOAs). Meanwhile, a channel tracking method is designed for the subsequent data transmission through a small number of pilot symbols. Specifically, the channel information is divided into the DOA information and the gain information, where the DOA information is tracked by a modified unscented Kalman filter and the gain information is estimated from beam training. Numerical results are provided to corroborate our studies.
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