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Design of delay-tolerant space–time codes with limited feedback

Wang, W., Zheng, F.-C. and Fitch, M. (2015) Design of delay-tolerant space–time codes with limited feedback. IEEE Transactions on Vehicular Technology, 64 (2). pp. 839-845. ISSN 0018-9545

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To link to this item DOI: 10.1109/TVT.2014.2322623


In cooperative communication networks, owing to the nodes' arbitrary geographical locations and individual oscillators, the system is fundamentally asynchronous. Such a timing mismatch may cause rank deficiency of the conventional space-time codes and, thus, performance degradation. One efficient way to overcome such an issue is the delay-tolerant space-time codes (DT-STCs). The existing DT-STCs are designed assuming that the transmitter has no knowledge about the channels. In this paper, we show how the performance of DT-STCs can be improved by utilizing some feedback information. A general framework for designing DT-STC with limited feedback is first proposed, allowing for flexible system parameters such as the number of transmit/receive antennas, modulated symbols, and the length of codewords. Then, a new design method is proposed by combining Lloyd's algorithm and the stochastic gradient-descent algorithm to obtain optimal codebook of STCs, particularly for systems with linear minimum-mean-square-error receiver. Finally, simulation results confirm the performance of the newly designed DT-STCs with limited feedback.

Item Type:Article
ID Code:39822
Uncontrolled Keywords:Asynchronous relay network, delay-tolerant space-time codes, limited feedback.

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