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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...
Contemporary communication systems are based on modular architectures, where the role of the physical layer is essentially confined to error correction, whereas information security is typically dealt with at the upper layers of the protocol stack. We consider a security architecture that does exactly the opposite: information sequences are first converted to longer channel codewords which are then...
The IEEE 802.16 standard, or WiMAX, has emerged to facilitate high-bandwidth wireless access in real- world metropolitan areas, commonly referred to as 4G. In WiMAX, hybrid automatic repeat request (HARQ) is adopted to transmit data packets reliably. However, it sacrifices resilience in time varying channels, and it may under-utilize the wireless medium in the cases of multi-path and multi-hop transmissions...
This paper proposes a novel, reliable and efficient advertisements delivery protocol (ADP) for use in unidirectional wireless billboard channels (WBCs) for IP datacasting (lPDC). The ADP is based on a modified asynchronous layered coding (ALC) protocol and uses a forward error correction (FEC) with Reed-Solomon (RS) coding to guarantee packet-level reliable data broadcasting. The ADP implementation...
Cooperative wireless communications offers a new dimension of diversity by emulating transmit antenna diversity to provide reliable communications. In cooperative diversity, single-antenna radios behave as relays between a source and destination, and the performance improvements are due to cooperation of the source and the relay. However, a misbehaving relay can degrade the envisaged performance improvements...
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