A Physical Layer Network Coding Design for 5G Network MIMO

TL;DR

This paper introduces a novel physical layer network coding scheme for 5G MIMO systems that reduces backhaul load and improves outage performance through adaptive binary mapping and efficient search algorithms.

Contribution

It proposes a new PNC design criterion based on binary matrix theory and an adaptive optimal mapping selection algorithm for 5G network MIMO uplink scenarios.

Findings

Achieves lower outage probability compared to CoMP schemes.

Reduces backhaul load significantly.

Provides a computationally efficient binary PNC mapping algorithm.

Abstract

This paper presents a physical layer network coding (PNC) approach for network MIMO (N-MIMO) systems to release the heavy burden of backhaul load. The proposed PNC approach is applied for uplink scenario in binary systems, and the design guideline serves multiple mobile terminals (MTs) and guarantees unambiguous recovery of the message from each MT. We present a novel PNC design criterion first based on binary matrix theories, followed by an adaptive optimal mapping selection algorithm based on the proposed design criterion. In order to reduce the real-time computational complexity, a two-stage search algorithm for the optimal binary PNC mapping matrix is developed. Numerical results show that the proposed scheme achieves lower outage probability with reduced backhaul load compared to practical CoMP schemes which quantize the estimated symbols from a log-likelihood ratio (LLR) based multiuser detector into binary bits at each access point (AP).