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In cooperative networks, processing at the forwarding nodes is a major source of error propagation. In this context, a novel spectrally efficient distributed space-time block coded (STBC) transmission scheme with error protection for such networks is proposed. The proposed scheme retains the spatial diversity and enhances the bandwidth efficiency by integrating incremental redundancy techniques into...
We consider the performance of small-scale heterogeneous cooperative networks in which some nodes can transmit and/or receive using channels not available to other nodes, i.e., multimodal communication networks. As an example, we assume the presence of an additional wired channel in a conventional diamond relay network operating under the Laneman protocol, and we find analytical expressions for outage...
In this paper, we propose and evaluate the performance of two cooperative multi-hop transmission protocols. We derive expressions of packet error rate (PER) and average number of transmissions for the proposed protocols. The Monte-Carlo simulations are presented to verify the theoretical analyses.
This paper studies a network coding scheme that exploits a cooperative diversity and adaptation to variant link states for reliable networks. We propose a scheme, adaptive rate network coding (ARNC), to change the number of transmission in relay nodes according to channel states over fading channels by matching network graphs with rateless code graphs, raptor codes. In ARNC scheme, a relay transmits...
We develop and analytically study the performances of three relay selection techniques for a two-hop decode-and-forward (DF) cooperative communication system in a large wireless sensor network with uniformly distributed nodes. It is assumed that there is no central processing unit to optimally select the relay and that the nodes use their locally available knowledge, that is, their distances from...
A novel cooperative Hybrid-ARQ protocol was presented on the basis of network coding (C-HARQ-NC). Two users communicated with the base station with the assistance of a relay node. Relay node responded the repeat request and processed two users' incremental redundancy frames with physical-layer network coding, i.e. signal superposition modulation, before transmitting to the base station. Multi-user...
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