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We derive a decision-feedback channel estimation receiver for independent and non-identically distributed (i.n.d.) Rayleigh fading channels. The receiver has memory to store signals received over the past several symbol intervals, and then use them to adaptively estimate instantaneous channel gains. The receiver adapts its decision rule based on es...
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... Fig. 1, we show the BER of an i.n.d. system for various channel statistics. It can be observed that the nonidentical distribution of channel gains among diversity branches de- grades the BER performance from the case of independent and identically distributed (i.i.d.) branches. Moreover, the BER of the channel estimation receiver has an error ...
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Citations
... where erf c is the complementary error function [10]; E S is the mean received energy per symbol per diversity channel, ˆ h is the channel coefficient estimate and α is some angle [9], which is zero for BPSK modulation [11]. We assume that the block-fading channel estimatê h follows the Rayleigh distribution, which has the Probability Density Function (PDF) of [6] f ...
Hybrid Automatic-Repeat-reQuest (ARQ) schemes are capable of maintaining reliable communications for transmission over hostile wireless channels. In coherent detection aided schemes, the achievable performance substantially depends on the accuracy of channel state information (CSI). In this paper, the impact of imperfect CSI on Reed-Solomon (RS) coded HybridARQ systems is investigated for transmission over block-Rayleigh fading channels. The corresponding goodput equation is derived and used to evaluate the system's performance. The effects of code rate and channel quality are also visualized. Furthermore, the results are utilized for the optimization of the pilot versus data symbols power allocation in order to maximize the system's goodput. Quantitatively, the proposed scheme provides a 2.5 dB E<sub>b</sub>/N<sub>0</sub> gain at a given goodput for the (255/223) RS code defined over the GF(256).
