Abstract
Massive MIMO system uses the transmitter channel state information (CSI) to preprocess the transmitted data, which can effectively reduce the interference and enhance the Massive MIMO system capacity. In the actual transmission process, reciprocity is subject to many factors, resulting in application difficulties. In this paper, we mainly study the influence of RF device’s noncardiosis on channel reciprocity of Massive MIMO system. Combined with channel estimation based on pilot signal and FRRH subspace tracking algorithm, this paper proposes a channel reciprocity calibration method for Massive MIMO. Finally, the compensation effect of the compensation algorithm is verified by simulation.
Highlights
Massive MIMO system uses the transmitter channel state information (CSI) to pre-process the transmitted data, which can effectively reduce the interference and enhance the Massive MIMO system capacity [1]
The base station can get the downlink channel CSI from the uplink channel CSI obtained by the uplink channel estimation, that is, the uplink and downlink channels are reciprocal [2, 3]
Channel time-varying, nonideality of radio frequency devices and asymmetry of uplink and downlink interference modes will lead to a certain degree of loss of channel reciprocity, resulting in that the base station can not directly obatain the downlink channel CSI from uplink channel CSI [4, 5]
Summary
Massive MIMO system uses the transmitter channel state information (CSI) to pre-process the transmitted data, which can effectively reduce the interference and enhance the Massive MIMO system capacity [1]. In the TDD system, the uplink and downlink data transmission uses the same frequency, and the uplink and downlink wireless channel environments are the same. Channel time-varying, nonideality of radio frequency devices and asymmetry of uplink and downlink interference modes will lead to a certain degree of loss of channel reciprocity, resulting in that the base station can not directly obatain the downlink channel CSI from uplink channel CSI [4, 5]. [9] proposed a calibration method based on mutual coupling of time-division duplex massive MIMO system. [10] considered the channel estimation error to simulate and analyze the effect on TDD multi-user massive MIMO system linear precoding caused by RF mismatch. In this paper, based on the above research, combined with the channel prediction, the impact of the RF devices’ non-ideal channel reciprocity and compensation algorithm are simulated and researched
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