Cooperative Communications and Networking
Cooperative Communications and Networking
Multi-relay cooperative OFDM with amplify-and-forward relaying
RWS'09 Proceedings of the 4th international conference on Radio and wireless symposium
Low-complexity multipath diversity through fractional sampling in OFDM
IEEE Transactions on Signal Processing
Blind OFDM channel estimation through simple linear precoding
IEEE Transactions on Wireless Communications
Diversity through coded cooperation
IEEE Transactions on Wireless Communications
IEEE Transactions on Information Theory
Diversity and multiplexing: a fundamental tradeoff in multiple-antenna channels
IEEE Transactions on Information Theory
Distributed space-time-coded protocols for exploiting cooperative diversity in wireless networks
IEEE Transactions on Information Theory
Maximum multipath diversity with linear equalization in precoded OFDM systems
IEEE Transactions on Information Theory
Cooperative communication in wireless networks
IEEE Communications Magazine
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A new cooperative scheme for a two-user orthogonal frequency division multiple access (OFDMA) uplink communication scenario is proposed. Each user is equipped with one transmit/receive antenna. Before transmission, inter-block linear precoding is introduced to pairs of blocks. The cooperative transmission is implemented in cycles of three time slots. During each slot, a user transmits either his data, or a weighted mixture of his data and the data that he received in previous slots of the same cycle. The weights are obtained in an optimum fashion, so that a user that faces deep fading on certain subcarriers can benefit from the other user's channel, without taxing significantly the resources of that user. It is shown that the proposed scheme achieves the maximum available diversity for both users (full cooperation), or for the weak user (half cooperation) without increasing the number of antennas needed as compared to an energy-equivalent noncooperative OFDMA system that also uses inter-block precoding. Further, the proposed use of inter-block precoding allows one to exploit the cooperation induced diversity in 1.5 slots on the average; 2 slots would be needed if intra-block precoding was used instead.