Direct beamformer estimation for hybrid architecture in mmWave dynamic TDD system
Shah, Prashant Kumar; Joshi, Krishna; Joshi, Satya; Tölli, Antti; Umebayashi, Kenta (2020-06-25)
P. K. Shah, K. Joshi, S. Joshi, A. Tolli and K. Umebayashi, "Direct Beamformer Estimation for Hybrid Architecture in mmWave Dynamic TDD System," 2020 IEEE Wireless Communications and Networking Conference Workshops (WCNCW), Seoul, Korea (South), 2020, pp. 1-6, doi: 10.1109/WCNCW48565.2020.9124904
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The problem of weighted sum-rate maximization for hybrid architecture in millimeter wave communications with dynamic time division duplexing is considered. We propose an over the air pilot- aided direct beamforming estimation technique for the considered problem, by exploiting the channel reciprocity. Proper selection of analog precoder/combiner not only suppresses large part of interference, but also ensures that less coordination is required for digital precoder/combiner design. We design analog precoder/combiner for each data stream in such a way that its signal strength is maximized; this strategy also minimizes large part of inter-stream interference that may arise due to the main lobe of analog beamformer. Then we design digital beamformer such that inter-stream interference is further mitigated, maximizing the overall weighted sum-rate of the network.
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