Study of Buffer-Aided Distributed Space-Time Coding for Cooperative Wireless Networks

TL;DR

This paper introduces adaptive buffer-aided distributed space-time coding schemes with feedback for cooperative wireless networks, enhancing bit error rate performance through relay selection and optimization.

Contribution

It presents novel buffer-aided distributed space-time coding schemes with adaptive algorithms and feedback, improving cooperative network performance.

Findings

Significant BER performance improvements over existing methods.

Effective relay selection algorithms exploiting buffer capabilities.

Enhanced diversity and error probability analysis.

Abstract

This work proposes adaptive buffer-aided distributed space-time coding schemes and algorithms with feedback for wireless networks equipped with buffer-aided relays. The proposed schemes employ a maximum likelihood receiver at the destination and adjustable codes subject to a power constraint with an amplify-and-forward cooperative strategy at the relays. Each relay is equipped with a buffer and is capable of storing blocks of received symbols and forwarding the data to the destination if selected. Different antenna configurations and wireless channels, such as static block fading channels, are considered. The effects of using buffer-aided relays to improve the bit error rate (BER) performance are also studied. Adjustable relay selection and optimization algorithms that exploit the extra degrees of freedom of relays equipped with buffers are developed to improve the BER performance. We also analyze the pairwise error probability and diversity of the system when using the proposed schemes and algorithms in a cooperative network. Simulation results show that the proposed schemes and algorithms obtain performance gains over previously reported techniques.