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We propose a relaying scheme based on superposition coding (SC) with discrete adaptive modulation and coding (AMC) for a three-node wireless relay system, based on half duplex transmission, where each node decodes messages by successive interference cancelation (SIC).
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The delay of half duplex is a double of full duplex.
This provides one-to-one and one-to-many communications based on half-duplex VoIP technology.
However, most of them focused on half-duplex relay systems, which encounter loss of resource efficiency.
We first focus on half-duplex systems, using polarization diversity: in this case, the link throughput is.
It is assumed that all primary and secondary terminals are equipped with single omni-antenna and work on half-duplex mode by using time division multiple access (TDMA).
Finally, as we consider a cooperative secondary network based on half-duplex nodes, the secondary transmissions occur in two time slots.
The relay behavior is governed by cooperative protocols which can operate either on half-duplex (HD) or on full-duplex (FD) modes, using parallel or repetition coding, selective or incremental strategies, etc. [5, 7 9].
The paper "Bounds on the capacity regions of half-duplex Gaussian MIMO relay channels" by L. Gerdes, M. Riemensberger, and W. Utschick analyzes the half-duplex Gaussian MIMO relay channel and considers both unidirectional and bidirectional communication.
Communication was successful up to 38,400 bps on the computers in asynchronous half duplex mode, at packet sizes varying from 50 to 2000 bytes.
In [12], a hybrid scheduler was proposed that shifts between the IBFD and half duplex based on the best available circumstances.
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