Hybrid beamforming for large-scale MIMO systems using uplink-downlink duality

2018 IEEE 10th Sensor Array and Multichannel Signal Processing Workshop (SAM)

Pesavento

2018

Self Cite

Hybrid analog-digital beamforming has been shown to reduce hardware cost and power consumption in massive MIMO systems, at the expense of increased radiated power for given performance targets. To alleviate the above shortfall, in this paper we exploit the concept of constructive interference (CI) that has been shown to offer significant radiated power savings in fully-digital multiuser downlink MIMO systems. We explore analog beamforming design, and develop solutions specifically tailored for CI-based hybrid beamforming. We also evaluate the performance of the presented techniques and their computational complexities using simulation results.

“…. In the ES method we compute for each ABF matrix A v ∈ A the corresponding optimal DBF b v by solving problem (5) and the corresponding transmit power…”

Section: B Codebook-based Abf Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analog Beamformer Design for Interference Exploitation Based Hybrid Beamforming

2018 IEEE 10th Sensor Array and Multichannel Signal Processing Workshop (SAM)

Pesavento

2018

Self Cite

“…Instead of adjusting both magnitude and phase of the transmitted symbols as in the digital precoding, in analog precoding only the phase of the incoming signal is adapted, which leads to a reduced degree of freedom in the precoder design. As a consequence, the required transmit power is increased to achieve the same QoS, in contrast to fully digital precoding [8][9][10]. One approach to improve the power efficiency is using the constructive interference (CI) technique, in which the interference power is exploited to improve the useful signal power at the users [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Interference Exploitation-Based Hybrid Precoding With Robustness Against Channel Errors

Fan

2020 IEEE 11th Sensor Array and Multichannel Signal Processing Workshop (SAM)

et al. 2020

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The extremely high cost associated with massive multipleinput multiple-output (MIMO) systems when it is employed with fully digital precoding can be reduced by applying hybrid precoding at an expense of increased transmit power. In such a hybrid precoding system, the transmit power required to achieve a certain quality-of-service (QoS) can be significantly reduced by employing the constructive interference (CI) precoding technique. However, as illustrated in the paper, the symbol error rate (SER) performance of CI-based precoding is very sensitive to channel errors. To address this challenge we propose a hybrid precoding approach with robustness against channel quantization error and channel estimation error. Simulation results demonstrate the superior energy efficiency of the proposed robust hybrid precoding when compared to that of a conventional non-robust precoding scheme in achieving a required QoS target.

“…A major drawback of the hybrid precoding is its reduced energy efficiency due to the limited degrees of freedom resulting from a smaller number of RF chains and constant gains of the PSs [14][15][16]. To address this challenge, the constructive interference (CI)-based precoding technique [17][18][19][20] has been extended to hybrid precoding architecture in [ [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Robust Hybrid Precoding For Interference Exploitation in Massive Mimo Systems

ICASSP 2020 - 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

Pesavento

2020

Self Cite

In this paper, we consider a multiuser massive MIMO system with hybrid analog-digital precoding architecture. The phase shifters in the hybrid precoding architecture are assumed to be imperfect, where the true values of both phase and magnitude of the phase shifters are different from their nominal values. For a given analog precoding matrix, we develop an iterative algorithm to compute robust digital precoders based on the interference exploitation approach to eliminate any potential symbol errors due to the phase shifter impairments. Numerical experiments demonstrate the performance of the proposed algorithm and show its advantage over a conventional robust precoding technique.