Direct Beamformer Estimation for Hybrid Architecture in mmWave Dynamic TDD System

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.

Authors:
Shah Prashant Kumar, Joshi Krishna, Joshi Satya, Tölli Antti, Umebayashi Kenta

Publication type:
A4 Article in conference proceedings

Place of publication:
2020 IEEE Wireless Communications and Networking Conference Workshops, WCNCW 2020

Keywords:
beamforming, dynamic TDD, hybrid architecture, mmWave

Published:
25 June 2020

Full citation:
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

DOI:
https://doi.org/10.1109/WCNCW48565.2020.9124904

Read the publication here:
http://urn.fi/urn:nbn:fi-fe2020101684225