Open Access Research

Relay on-off threshold for NDF protocol with distributed orthogonal space-time block codes

Dong-Sup Jin1, Xianglan Jin2, Jong-Seon No1 and Dong-Joon Shin3*

Author Affiliations

1 Department of Electrical Engineering and Computer Science, INMC, Seoul National University, Seoul 151-744, Korea

2 Department of Information and Communication Engineering, Dongguk University-Seoul, Seoul 100-715, Korea

3 Department of Electronic Engineering, Hanyang University, Seoul 133-791, Korea

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EURASIP Journal on Wireless Communications and Networking 2012, 2012:305 doi:10.1186/1687-1499-2012-305

Published: 26 September 2012

Abstract

In this article, a relay on-off threshold (ROT) based on symbol error rate is derived for the cooperative communication networks with multiple antennas, where the non-orthogonal decode-and-forward (NDF) protocol with source antenna switching and linear combining decoding are used as the relaying protocol and decoding scheme, respectively. The optimal ROT for the cases using distributed orthogonal space-time block codes is derived for high signal to noise ratio (SNR) region and also a suboptimal ROT is provided for low SNR region. Finally, the diversity order of the NDF protocol using the relay on-off scheme with the proposed ROT is derived and its performance is verified through numerical analysis.

Keywords:
Cooperative communication networks; Cooperative diversity; Distributed orthogonal space-time block codes (DOSTBCs); Linear combining (LC) decoding; Non-orthogonal decode-and-forward (NDF); Relay on-off threshold (ROT)