Reciprocity Calibration for Base Station Antenna in Massive MIMO Time Division Duplex Systems
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摘要: 對于采用大規(guī)模MIMO技術(shù)的時分雙工系統(tǒng)，基站天線的互易誤差會破壞上下行基帶信道互易特性，大幅降低系統(tǒng)下行傳輸性能?？紤]到大規(guī)模MIMO技術(shù)所帶來的基站天線間的耦合效應(yīng)，該文設(shè)計了基于總體最小二乘估計的基站天線互易校準(zhǔn)算法，以實現(xiàn)對基站的天線互易誤差的補(bǔ)償。該算法以增加計算復(fù)雜度為代價，以及通過增加信道測量樣本，克服了上下行信道估計誤差對現(xiàn)有天線互易誤差校準(zhǔn)算法的影響。同時，該文通過瑞利商迭代求解降低了該算法的復(fù)雜度。若忽略用戶天線互易誤差，計算機(jī)仿真結(jié)果表明，該算法相對于現(xiàn)有的基站天線互易誤差校正算法，具有1.8 dB左右的性能增益。若考慮用戶天線互易誤差，該算法相對于已有的算法，具有隨信道估計誤差方差減小而增大的增益。
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關(guān)鍵詞:
- 無線通信 /
- 大規(guī)模MIMO /
- 信道互易誤差 /
- 互易校準(zhǔn)
Abstract: The downlink transmission performance of the massive MIMO Time Division Duplex (TDD) system is bottlenecked by the channel reciprocity errors called antenna reciprocity errors. Antenna reciprocity errors are caused by the mismatch and mutual coupling between antennas. In order to compensate antenna reciprocity errors of the base station, a reciprocity calibration algorithm is proposed in this paper, which can reduce the impact of channel estimate errors by using total least square estimation and increasing channel measurement samples. Rayleigh quotient iteration is also used to reduce the complexity of the reciprocity calibration algorithm in this paper. Simulation results reveal that the algorithm proposed in this paper can achieve 1.8 dB performance gain with respect to the traditional one proposed in references when the antenna reciprocity errors of user equipments are ignored. When the antenna reciprocity errors of user equipments are considered,the performance of the proposed algorithm increases with the decreasing variance of the channel estimation errors. -
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