The key challenge in free space optical (FSO) communications is combating turbulence-induced fading. As the channel fading FSO quasi-static, transmission parameters such as code rates, transmit power and modulation schemes can be modified with respect to state information transmitted via feedback path. a result, adaptive coding considered one of practical approaches improve link performance. In...

This paper has developed a fast variable-length decoder which uses a plane separation technique to reduce the processing time of the feedback path in the decoder. The developed decoder performs two shift processes and a decision process concurrently. Therefore, the processing time in the feedback path of our developed variable length decoder can be improved and determined by the longest time am...

—In this letter, we propose parallel SC (Successive Cancellation) decoder and parallel SC-List decoder for polar codes. The parallel decoder is composed of) 1 (2   m M m component decoders working in parallel and each component decoder decodes a Polar code of a block size of M / 1 of the original Polar code. Therefore the parallel decoder has M times faster decoding speed. Our simulation resu...

The lazy Viterbi decoder is a maximum-likelihood decoder for block and stream convolutional codes. For many codes of practical interest, under reasonable noise conditions, the lazy decoder is much faster than the original Viterbi decoder. For a code of constraint length , the lazy algorithm is about 50% faster than an optimized implementation of the Viterbi decoder whenever SNR dB. Moreover, wh...

The synthesis of a hardware implementation of a Viterbi decoder from a behavioural specification is discussed. This is applied to a parallelized version of a BCH decoder. A parameterizable high-level VHDL model of the parallel decoder has been developed. Scalability of the parallel decoder in hardware is demonstrated. An extension of this technique to an adaptive decoder is discussed.

We propose to employ a recurrent neural network estimate fluctuating magnetic field from continuous optical Faraday rotation measurement on an atomic ensemble. show that encoder-decoder architecture can process data and learn accurate map between recorded signals the time-dependent field. The performance of this method is comparable Kalman filters while it free theory assumptions restrict their...