Optimal ZF Precoder Under per Antenna Power with Conjugate Beamforming for MU Massive MIMO Systems

Nyarko, James Kweku Nkrumah; Mbom, Christian Ango

doi:10.1007/978-3-319-78139-6_20

Cited by 1 publication

(2 citation statements)

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“…where p i is power of ith transmit antenna. From (3), the nth user received signal y n can be expanded by the help of the precoded transmitted signal as [17]…”

Section: System Modelmentioning

confidence: 99%

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

Nyarko¹,

Mbom²

2019

ICST Transactions on Mobile Communications and Applications

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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.

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“…where p i is power of ith transmit antenna. From (3), the nth user received signal y n can be expanded by the help of the precoded transmitted signal as [17]…”

Section: System Modelmentioning

confidence: 99%

“…Note that this current journal paper extends the conference version in[17], the cases of Ricean Channel, Norm approximation and Optimal power Allocation are included.…”

mentioning

confidence: 99%

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

Nyarko¹,

Mbom²

2019

ICST Transactions on Mobile Communications and Applications

View full text Add to dashboard Cite

show abstract

Optimal ZF Precoder Under per Antenna Power with Conjugate Beamforming for MU Massive MIMO Systems

Cited by 1 publication

References 10 publications

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

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

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