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Estimation of the variance of AWGN is important to the initialization of iterative decoder, such as turbo code and LDPC code. Hence this paper puts forward a low-complexity and effective blind Gaussian variance estimator for MPSK and MQAM. The algorithm is derived from empirical characteristic function and provides a good un-biased estimation despite the knowledge of modulation type, as is proved...
The impulsive interferences are not negligible in many communication channels, such as power line channels. During the initialization of Turbo iterative decode algorithm, e.g., message passing algorithm for Low-Density Parity-Check code's decoder, it is necessary to estimate parameters of channel to retrieve the prior information from the received signals. Performances of the detector/estimator based...
In order to retrieve the pre-estimated information from the received signals, it is necessary to estimate the variance of AWGN channel during the initialization of Turbo iterative decoder. Some literature has been devoted to this problem in BPSK/8PSK scenarios, and in this paper, we present another low-complexity blind SNR estimation method based on empirical characteristic functionpsilas derivative...
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