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This paper presents performance analysis and cross-layer design approaches for hybrid ARQ (HARQ) protocol in wireless networks which employ adaptive modulation and coding (AMC) at the physical layer and are subject to time-correlated fading channels. Utilizing a Markov channel model which accounts for the temporal correlation in successive parity transmissions by the adaptive rate HARQ protocol, we...
Adaptive relaying schemes significantly improve the performance of relay networks by switching the forwarding technique according to the reliability of the received signal. In adaptive relaying without ARQ all the relays forward irrespective of the decoding status at the destination. This leads to inefficient resource utilization. In ARQ relay networks, the message is repeated upon the request from...
In this paper, we consider multiuser cooperative multiplexing schemes in cellular networks with fixed relays and address the problem of inter-user interference. We propose two schemes to mitigate the effect of the interference: an interference cancellation scheme and a cooperative precoding scheme. The interference cancellation scheme utilizes the broadcast nature of the signal transmitted to the...
In this paper, we compute the throughput capacity of wireless ad hoc network when nodes are capable of multi-packet reception (MPR) under the physical model. Earlier results show that the optimistic protocol model [1] provides a tight bound of Theta(D(n)) where D(n) and n denote the decoding range and the number of nodes in the network respectively. On the other hand, the throughput capacity under...
Cooperative communications can exploit distributed spatial diversity gain to improve link performance. When the message is coded at a low rate, source and relay can send different parts of a codeword to destination. This is referred to as the coded cooperation. In this paper, we propose two novel coded cooperation schemes for three-node relay networks, i.e., adaptive coded cooperation and ARQ-based...
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