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Distributed Orthogonal and Quasi-Orthogonal Space-Time Block Code with Embedded AAF/DAF Matrix Elements in Wireless Relay Networks with Four Relays

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Abstract

We consider cooperative networks of one source, four relays, and one destination. Each of them has a single antenna. The four relays use a proposed full rate distributed quasi orthogonal space time block code (DQOSTBC) scheme. If the channel state between the source and a relay is above a threshold, we select the elements of the DQOSTBC matrix to be the decode-and-forward (DAF) type; if it is below the threshold, the corresponding elements are the amplify-and-forward (AAF) type. Thus the proposed scheme is a DQOSTBC matrix with embedded adaptive DAF/AAF elements. The bit error rate (BER) simulation results show that the proposed DQOSTBC is approximately 7 dB better than the traditional DQOSTBC (all matrix elements are fixed as DAF type) at a BER of \(10^{-3}\) because traditional DQOSTBC loses full diversity due to errors in the information received. The proposed DQOSTBC is about 3 dB better than the rate 1/2 DOSTBC also proposed with adaptive DAF/AAF matrix elements at a BER of \(10^{-3}\) at the same spectral efficiency of 2 bits/s/Hz.

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Acknowledgments

This work was supported by the National Science Council of Taiwan under Grant NSC 101-2221-E-027-106. The system model is different in terms of number of source-relay-destination (4-1-1 in our ICOIN 2013 paper [14] v.s.1-4-1 in this paper). The system model in [14] has four independent single-antenna sources (multiple source/user), a single-antenna destination and a single-receive four-transmit antenna pure DAF relay node. And in this paper, the system model has one source node, one destination node and four relay nodes. There are all single-antenna nodes. In addition, this paper has performance analysis and [14] doesn’t. We also add simulation result with CRC [15] in Fig. 4, which [14] doesn’t have.

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  1. Department of Electronic Engineering, National Taipei University of Technology, 106 , Taipei, Taiwan

    Shu-Ming Tseng & Che-Ying Liao

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  1. Shu-Ming Tseng
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  2. Che-Ying Liao
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Correspondence to Shu-Ming Tseng.

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Tseng, SM., Liao, CY. Distributed Orthogonal and Quasi-Orthogonal Space-Time Block Code with Embedded AAF/DAF Matrix Elements in Wireless Relay Networks with Four Relays. Wireless Pers Commun 75, 1187–1198 (2014). https://doi.org/10.1007/s11277-013-1415-2

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