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Randomized Space-Time Coding for Distributed Cooperative Communication: Fractional Diversity

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2 Author(s)
B. S. Mergen ; School of Electrical & Computer Engineering, Cornell University, Ithaca, NY 14853 ; A. Scaglione

We study the problem of designing distributed space-time codes for cooperative communication. A major challenge in distributed cooperative transmissions is to find a way to coordinate the relay transmissions without requiring extra control information overhead. Most of the previous works on the subject assume each node emulates a predetermined antenna of a multiple-antenna system. However, this requires a centralized "antenna allocation" procedure. Here, we introduce randomized strategies that decentralize the transmission of a space time code from a set of distributed relays. The simple idea we propose is to let each node transmit a random linear combination of the codewords that would be transmitted by all the antennas in a centralized space time coding scheme. We provide different code designs that achieve the diversity order (min(N, L)) when number of nodes N is different than the number of virtual antennas L. In this paper, we focus on the case when N = L and we show that under certain designs the achieved diversity order is fractional

Published in:

2006 IEEE International Conference on Acoustics Speech and Signal Processing Proceedings  (Volume:4 )

Date of Conference:

14-19 May 2006