# Hybrid-ARQ in Multihop Networks with Opportunistic Relay Selection

## TL;DR

This paper introduces a distributed relay selection method using opportunistic feedback in multihop networks, improving throughput and performance without centralized coordination.

## Contribution

It proposes a novel contention-based feedback technique for relay selection that operates in a distributed manner, matching centralized GPS-based schemes in performance.

## Key findings

- Performance closely matches centralized GPS-based schemes.
- Achieves throughput gains over point-to-point transmission.
- Effective in dense wireless networks.

## Abstract

This paper develops a contention-based opportunistic feedback technique towards relay selection in a dense wireless network. This technique enables the forwarding of additional parity information from the selected relay to the destination. For a given network, the effects of varying key parameters such as the feedback probability are presented and discussed. A primary advantage of the proposed technique is that relay selection can be performed in a distributed way. Simulation results find its performance to closely match that of centralized schemes that utilize GPS information, unlike the proposed method. The proposed relay selection method is also found to achieve throughput gains over a point-to-point transmission strategy.