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Literatures on precoding for massive MIMO, one disruptive technology for enabling 5G, have been mainly about metrics such as capacity and peak-to-average reduction. But for practical systems, block error rate (BLER) is one essential parameter that decides whether the system can work properly. In this work, we consider BLER of different precoding methods, and find that when applied to OFDM based massive...
We propose an adaptive frequency-domain channel estimator based on Kalman smoothing for uplink multiple input multiple output (MIMO) orthogonal frequency division multiplexing access (OFDMA) systems. The application of Kalman smoothing in frequency-domain channel estimation results in a much lower computational complexity than time-domain estimation approaches. Channel interpolation is employed to...
In this paper, a beamspace-based pre-FFT beam-forming algorithm is proposed for orthogonal frequency division multiplexing (OFDM) systems with antenna arrays in multi-path fading channels. In the receiver, multiple beams are generated firstly to cover the direction of arrival (DOA) range from 0 to 360 degrees. Then one or more delayed paths with large power are estimated by correlation process and...
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