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Successive Relaying Aided Near-Capacity Irregular Distributed Space-Time Coding

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  • Communication
  • Design


1 Successive Relaying Aided Near-Capacity Irregular Distributed Space-Time Coding Lingkun Kong, Soon Xin Ng, Robert G. Maunder, and Lajos Hanzo School of ECS, University of Southampton, SO17 1BJ, United Kingdom. Tel: +44-23-8059 3125, Fax: +44-23-8059 4508 Email: {lk06r,sxn,rm,[email protected], Abstract— In this paper, an Irregular Distributed Space-Time (Ir-DST) coding scheme is studied in the context of a twin-relay aided network in which the successive relaying protocol is employed. A tight upper- bound of the successive relaying aided network’s capacity is given. The distributed codes at the source and relays are jointly designed with the aid of EXtrinsic Information Transfer (EXIT) charts for the sake of high-integrity operation at Signal-to-Noise Ratios (SNRs) close to the corresponding network’s capacity. Finally, it is shown that our proposed Ir-DST coding scheme is capable of near-capacity cooperative communications in the successive relaying aided network, which is an explicit benefit of our joint source-and-relay mode design. I. INTRODUCTION A. Background Cooperative communications [1], [2] have drawn more and more attentions in the past few years, which combine the benefits of distributed Multiple-Input Multiple-Output (MIMO) systems with relay-aided techniques. In a relay aided network, where the nodes (users) are equipped with either single or multiple antennas, coop- erative communications allow the nodes (users) to assist each other in forwarding (relaying) all messages to the destination, rather than transmitting only their own messages. Since the MIMO transmitter’s elements in such a network are distributed, the network effectively forms a “distributed MIMO” system. For the sake of improving the diversity gain of relay-aided practical half-duplex-constrained net- works, numerous cooperative protocols [1]–[4] have been proposed. However, in most three-terminal cooperative scenarios, a significant multiplexing loss will be incurre

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