Limited Feedback in MISO Systems with Finite-Bit ADCs

TL;DR

This paper investigates the impact of limited feedback and finite-bit ADCs on MISO systems, deriving achievable rates and analyzing performance loss relative to perfect CSI, highlighting the linear relationship between feedback bits and ADC resolution.

Contribution

It provides a novel analysis of achievable rates in MISO systems with finite-bit ADCs and limited feedback, quantifying the performance loss and the feedback bits needed for mitigation.

Findings

Achievable rates are derived for systems with finite-bit ADCs and limited feedback.

Performance loss increases with lower feedback resolution and ADC quantization levels.

Number of feedback bits should scale linearly with ADC resolution to minimize loss.

Abstract

We analyze limited feedback in systems where a multiple-antenna transmitter sends signals to single-antenna receivers with finite-bit ADCs. If channel state information (CSI) is not available with high resolution at the transmitter and the precoding is not well designed, the inter-user interference is a big decoding challenge for receivers with low-resolution quantization. In this paper, we derive achievable rates with finite-bit ADCs and finite-bit CSI feedback. The performance loss compared to the case with perfect CSI is then analyzed. The results show that the number of bits per feedback should increase linearly with the ADC resolution to restrict the loss.