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In many communication media, optical systems, and some VLSI systems, only one errors type, either 0 → 1 or 1 → 0, can occur in any data word and the decoder knows a priori the error type. These types of errors are called asymmetric errors. Asymmetric Varshamov channels could be used to model some physical systems such as multilevel flash memories where there is an exponential...
Automatic repeat-request(ARQ) protocols for two-way relay systems, where two terminals communicating via a relay node, are investigated in this paper. According to different feedback schedules, we propose three basic ARQ protocols to improve the link reliability for two-way relay systems, namely Relay-only ARQ (Ro-ARQ), Terminal-only ARQ (To-ARQ) and Relay-Terminal ARQ (RT-ARQ). In addition, simulation...
Multi-hop wireless network based on IEEE 802.11 WiFi technology has emerged as a cost effective solution for accessing cellular networks or the Internet from the remote rural areas of the developing countries. Such access networks, typically, have long distance links that span tens of kilometers. Because of the long distance nature of the links, bit error rate is significant. Hence, to make these...
We introduce simple yet efficient ARQ protocols in conjunction with two types of anti-jamming coding techniques - rateless coding and piecewise coding - for cognitive radios. For piecewise coding, we propose to employ systematic codes to facilitate efficient selected retransmissions and design short codes to maximize secondary user throughput. For rateless coding, we consider a protocol that transmits...
In many wireless data systems, automatic repeat request (ARQ) and hybrid automatic repeat request (HARQ) work independently. In this paper, we introduce a new ARQ feedback scheme called Cross-Layer ARQ (CL-ARQ), where ARQ closely interoperates with HARQ by making use of the acknowledgement of HARQ internally. By doing so, CL-ARQ not only removes the overhead for ARQ acknowledgement messages, but also...
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