Rate Loss Analysis for Multiple-Antenna NOMA with Limited Feedback

TL;DR

This paper analyzes how limited feedback impacts the rate performance of MISO-NOMA systems, providing bounds on rate loss and showing that increased feedback bits improve sum rate performance.

Contribution

It derives an upper bound on rate loss due to quantization errors in limited feedback MISO-NOMA systems and demonstrates the approach to full CSI performance with more feedback bits.

Findings

Rate loss is bounded by the quantization error.

Sum rate approaches full CSI performance as feedback bits increase.

Numerical results validate the theoretical bounds.

Abstract

In the limited feedback downlink multiple-input single-output (MISO) non-orthogonal multiple access (NOMA) system, both the effective channel gain and the channel direction need to be quantized. The quantization error affects the feasible region of NOMA and the rate loss compared with the full channel state information (CSI) case. In this letter, we analyze this effect and obtain upper bound for the rate loss. The numerical results show that the sum rate of the limited feedback MISO-NOMA system approaches that of the full CSI as the number of feedback bits increases.