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We propose an efficient cooperative ARQ (Automatic Repeat request) scheme for multi-hop underwater acoustic communications, in which cooperative nodes are used to provide more reliable alternative paths for a specific source-relay-destination connection. Based on the knowledge of inter-node distances, a cooperative region is defined to include all possible candidates for cooperative nodes from a given...
This paper presents performance analysis and cross-layer design approaches for hybrid ARQ (HARQ) protocols in wireless networks, which employ adaptive modulation and coding (AMC) in conjunction with adaptive cooperative diversity and are subject to time-correlated fading channels. We first consider a point-to-point scenario, i.e., non-cooperative HARQ with AMC. Utilizing a Markov channel model which...
In this paper, we analyze the performance of a cooperative ARQ protocol in terms of throughput efficiency over a dual-hop Rayleigh fading channel. Three basic ARQ strategies are considered, the stop and wait, the go back N and the selective repeat. Two relaying methods are discussed: amplify and forward (AF) versus decode and forward (DF). Finally, simulation results are provided to validate our analysis.
In this paper we present a novel Hybrid Automatic Repeat reQuest (HARQ) scheme for cooperative communication systems, called Coded Partial Retransmission (CPR). The method is based on the retransmission of only a fraction of the original codeword by the cooperating nodes, applying an appropriate power allocation. Numerical results using LDPC codes and Type-I HARQ with Chase Combining show that CPR...
A Hybrid ARQ (HARQ) scheme employing a flexible amplify and forward (AF) relaying is considered for a cooperative relay channel. Two phase types with flexible length: one phase for relay reception and another phase for relay forwarding are assumed to accommodate half duplex relaying. We assume two types of encoding: repetition coding (RC) and unconstrained coding (UC). The outage performance of the...
Network coding (NC) and cooperative communication are both attractive techniques in wireless communication system. However the research of how to practically combine these two technologies, especially amplify-and-forward (AF) and NC to improve the system performance, is little. This paper proposes a simple AF automatic repeat request (ARQ) scheme with NC, which can be easy adopt by present time division...
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