Limited Feedback in Single and Multi-user MIMO Systems with Finite-Bit ADCs
Jianhua Mo, Robert W. Heath Jr

TL;DR
This paper investigates limited feedback strategies for MIMO systems with finite-bit ADCs, proposing new codebook designs and analyzing how feedback bits impact rate loss across different SNR regimes.
Contribution
It introduces a novel codebook design for beamforming with 1-bit ADCs and analyzes the relationship between feedback bits and rate loss in finite-bit ADC MIMO systems.
Findings
More feedback bits are needed in medium SNR to limit rate loss.
Rate loss is influenced by ADC resolution and feedback bits.
Feedback bits should increase linearly with ADC resolution to minimize rate loss.
Abstract
Communication systems with low-resolution analog-to-digital-converters (ADCs) can exploit channel state information at the transmitter and receiver. This paper presents codebook designs and performance analyses for limited feedback MIMO systems with finite-bit ADCs. A point-to-point single-user channel is firstly considered. When the received signal is sliced by 1-bit ADCs, the absolute phase at the receiver is important to align the phase of the received signals. A new codebook design for beamforming, which separately quantizes the channel direction and the residual phase, is therefore proposed. For the multi-bit case where the optimal transmission method is unknown, suboptimal Gaussian signaling and eigenvector beamforming is assumed to obtain a lower bound of the achievable rate. It is found that to limit the rate loss, more feedback bits are needed in the medium SNR regime than the…
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Taxonomy
TopicsAdvanced MIMO Systems Optimization · Energy Harvesting in Wireless Networks · Cooperative Communication and Network Coding
