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In this paper, we analyze two different decode-and-forward (DF) relay-assisted communication system models, which display different levels of practicality and represent large classes of DF systems in the literature. We spell out delineating aspects of the two models and rigorously show inequality among their symbol error probabilities (SEPs). Both system models assume imperfect channel side information...
In this paper, we present a novel method to derive a tight upper bound on the symbol error probability (SEP) of a rotation coded scheme in the case of Rayleigh fading channels. This upper bound has a closed-form expression and provides results closer to the exact expression than the union-Chernoff bound. We present numerical simulations that show the tightness of the proposed analytical upper bound...
In this paper, we study the issue of optimizing transmission power (energy per symbol) for minimizing the expected energy required to deliver a frame to the destination node in a point-to-point link employing an automatic repeat request (ARQ) scheme over a fading channel. We derive the expected energy as a function of the transmission power and derive a simple optimization algorithm based on the properties...
In this paper, we study the issue of optimally detecting symbols for a Selective-Decode-and-Forward (SDF) relay-assisted communication system in the presence of channel estimation error for flat Rayleigh fading channels. In the system studied, a pilot symbol-assisted modulation (PSAM) scheme is used along with a channel estimation scheme based on minimum mean square error (MMSE) criterion. In particular,...
This paper quantitatively analyzes the gain in error-constrained data throughput due to the extremely rapid (symbol-by-symbol) adaptation of symbol durations. The analysis includes systems equipped with maximal ratio combining. For uncoded communication systems, we provide numerical results obtained from the analysis of theoretical throughput gains. For some coded communication systems with commonly...
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