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Abstract: Recently Li and Xia have proposed a transmission scheme for wireless relaynetworks based on the Alamouti space time code and orthogonal frequencydivision multiplexing to combat the effect of timing errors at the relay nodes.This transmission scheme is amazingly simple and achieves a diversity order oftwo for any number of relays. Motivated by its simplicity, this scheme isextended to a more general transmission scheme that can achieve fullcooperative diversity for any number of relays. The conditions on thedistributed space time block code DSTBC structure that admit its applicationin the proposed transmission scheme are identified and it is pointed out thatthe recently proposed full diversity four group decodable DSTBCs from precodedco-ordinate interleaved orthogonal designs and extended Clifford algebrassatisfy these conditions. It is then shown how differential encoding at thesource can be combined with the proposed transmission scheme to arrive at a newtransmission scheme that can achieve full cooperative diversity in asynchronouswireless relay networks with no channel information and also no timing errorknowledge at the destination node. Finally, four group decodable distributeddifferential space time block codes applicable in this new transmission schemefor power of two number of relays are also provided.



Autor: G. Susinder Rajan, B. Sundar Rajan

Fuente: https://arxiv.org/



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