Optimal ZF Precoder for MU massive MIMO Systems over Ricean Channel with per Antenna Power Allocation

Nkrumah Nyarko, James Kweku and Ango Mbom, Christian (2019) Optimal ZF Precoder for MU massive MIMO Systems over Ricean Channel with per Antenna Power Allocation. EAI Endorsed Transactions on Mobile Communications and Applications, 4 (15): e3. ISSN 2032-9504

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Multiuser massive multiple-input multiple-output systems have the potential to increase the data rate. However, with a large base station (BS) antenna, the non-square channel matrix restricts the zero-forcing (ZF) precoder rotations to obtain the best optimal solution with the per-antenna power allocation. In this paper, we propose the beamforming and lattice reduction (LR) approach to restrain the channel matrix and transform the lattice of the channel vectors to be near orthogonal. Numerical results show that the LR-based ZF precoder outperforms other ZF precoder schemes, such as, the norm approximation of the beamforming matrix. In particular, the sum rate of the proposed optimal ZF precoder requires a small number of BS antenna. Subsequently, with the strong line of sight (LoS) channel, the optimal power allocations in the subchannels depend on the dominance of the users in order to achieve substantial multiplexing and diversity gains. Specifically, the Ricean channel gain with the water-filling allocation at high SNR is non-negligible.

Item Type: Article
Uncontrolled Keywords: MU massive MIMO, Ricean Fading, Zero Forcing, Lattice Reduction, Beamforming, Precoding, Per-antenna power Allocation
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
QA75 Electronic computers. Computer science
Depositing User: EAI Editor II.
Date Deposited: 08 Oct 2020 13:49
Last Modified: 08 Oct 2020 13:49
URI: https://eprints.eudl.eu/id/eprint/650

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