Performance of asynchronous amplify-and-forward cooperative relay networks
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
DAC: distributed asynchronous cooperation for wireless relay networks
INFOCOM'10 Proceedings of the 29th conference on Information communications
A linear analog network coding for asynchronous two-way relay networks
IEEE Transactions on Wireless Communications
Advances in relay networks: performance and capacity analysis of space-time analog network coding
EURASIP Journal on Wireless Communications and Networking
Diversity Analysis of Relay Selection Schemes for Two-Way Wireless Relay Networks
Wireless Personal Communications: An International Journal
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Perfect time synchronization among multiple relay nodes is quite difficult to realize in distributed relay networks. In this paper, we proposed a cyclic prefix (CP) assisted cyclic shift relaying (CFR) scheme for asynchronous two-way amplify-and-forward (AF) relay networks over flat fading channels. In the proposed scheme, a CP is inserted at the two source nodes to combat the asynchronous delays. Each relay amplifies the received mixed asynchronous signals after CP removal, and a cyclic delay is introduced to further improve the system performance. With the CP and the cyclic delay, the multiple flat fading relay channels are transformed into a multipath fading channel. As a result, low complexity frequency domain equalizers, such as zero-forcing and minimum mean square error (MMSE) equalizer, can be used to recover the transmit signal. Furthermore, the performance of the proposed CFR scheme with MMSE equalizer is analyzed and closed-form expression for the lower bound of uncoded bit error rate (BER) performance is derived. Based upon this lower bound, we also investigate the power allocation among the sources and the relays to improve the system performance. Finally, extensive numerical results are provided to show the BER and frame error rate performance of the proposed CFR scheme.