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The correlation coefficient of two consecutive Gaussian sequences is modulated by a binary message bit to achieve a secure communication system. The receiver of the proposed random communication system demodulates the received signal by estimating the correlation coefficient of the transmitted two consecutive sequences. Theoretical bit error rate (BER) expressions in frequency-flat/-selective fading...
In this study, the parameter of a symmetric α-stable (SαS) noise sequence is modulated by the binary message sequence to achieve a secure communication system. The characteristic exponent ‘α’ of an SαS noise sequence carries the binary information. In order to recover the binary message sequence at the receiver, the authors propose a logarithmic moments estimator to estimate the characteristic exponent...
The SNR values in conventional turbo decoding with the adaptive chase algorithm are pre-fixed, which is not practical in applications. To get rid of the deficiency, a novel decoding algorithm for block turbo codes was proposed, in which the channel levels of different SNR values were adaptively estimated. The proposed algorithm could tune the decoding complexity by using the relationship between the...
In a time-varying mobile channel, the Doppler effect causes intercarrier interference (ICI) in an OFDM system. Some researches have been found to mitigate the ICI effect in order to improve the system performance. However, ICI reduction algorithms usually require the information of the channel impulse response (CIR) even on each sample. In this paper we study several channel estimation algorithms...
The iterative message passing algorithm (MPA) for low-density parity-check (LDPC) codes is effective in the additive white Gaussian noise (AWGN) channels. However, the impulse interference is not negligible in many communication channels, such as power line channels, where the impulse interference greatly deteriorates the performance of MPA based on Gauss optimization. It is necessary to restudy the...
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