CDI Rate-balancing with Per-base-station Constraints

Konferenz: WSA 2016 - 20th International ITG Workshop on Smart Antennas
09.03.2016 - 11.03.2016 in München, Deutschland

Tagungsband: ITG-Fb. 261: WSA 2016

Seiten: 6Sprache: EnglischTyp: PDF

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Neumann, David; Gruendinger, Andreas; Joham, Michael; Utschick, Wolfgang (Associate Institute for Signal Processing, Technische Universität München, 80290 Munich, Germany)

We previously introduced a rate-balancing precoding technique based on channel distribution information, which significantly reduces the impact of pilot-contamination in the downlink of a massive MIMO system. We now extend the ratebalancing optimization problem for the precoders to multiple power constraints, to be able to apply the technique in a coordinated multi-point setting. For this problem, we derive an efficient and adaptive method to find a globally optimal solution based on transformation in the dual uplink. Finally, the results are compared to the optimization with a single sum-power constraint, where the beamforming vectors are simply scaled to satisfy the constraints at each base station.