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Leveraging coherent distributed space-time codes for noncoherent communication in relay networks via training

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2 Author(s)
Rajan, G.S. ; Dept. of Electr. Commun. Eng., Indian Inst. of Sci., Bangalore ; Rajan, B.S.

For point to point multiple input multiple output systems, Dayal-Brehler-Varanasi have proved that training codes achieve the same diversity order as that of the underlying coherent space time block code (STBC) if a simple minimum mean squared error estimate of the channel formed using the training part is employed for coherent detection of the underlying STBC. In this letter, a similar strategy involving a combination of training, channel estimation and detection in conjunction with existing coherent distributed STBCs is proposed for noncoherent communication in amplify-and-forward (AF) relay networks. Simulation results show that the proposed simple strategy outperforms distributed differential space-time coding for AF relay networks. Finally, the proposed strategy is extended to asynchronous relay networks using orthogonal frequency division multiplexing.

Published in:

Wireless Communications, IEEE Transactions on  (Volume:8 ,  Issue: 2 )

Date of Publication:

Feb. 2009

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