On the Capacity of CSI Based Transmission Link Selection in Decode-and-Forward Cooperative System

TL;DR

This paper analyzes the capacity of different CSI-based link selection schemes in a decode-and-forward cooperative system with multiple relays and a direct link, deriving analytical expressions and comparing their performance.

Contribution

It provides the first analytical derivation of ergodic capacity for full and partial CSI-based link selection in DF systems, enabling performance comparison.

Findings

Full CSI-based selection outperforms partial CSI schemes.

Analytical expressions for ergodic capacity are derived for both schemes.

Comparison shows the impact of CSI availability on system capacity.

Abstract

In this paper, we study the problem of best transmission link selection in a decode-and-forward (DF) cooperative system from capacity point of view. The transmission link can be a cooperative (via a relay) or direct link between the source and destination nodes. In a two-hop DF system with multiple relays and a direct link in between the source and destination, the transmission link selection can be performed based on full or partial channel state information (CSI) of all links involved in cooperation. We derive analytical ergodic capacity of full and partial CSI based path selection schemes in the DF cooperative system. Further, the full and partial CSI based link selection schemes are compared with help of these expressions.