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A modified carrier phase estimation algorithm based on Viterbi-Viterbi phase estimation method is proposed for high-level square QAM-based optical coherent systems. All of the received symbols are used to estimate the carrier phase in order to enhance the tolerance of laser phase noise. Compared to the previous algorithms, the computation complexity of the proposed algorithm is lower and does not...
In this paper, we develop a centralized spectrum sensing and Dynamic Spectrum Access (DSA) scheme for secondary users (SUs) in a Cognitive Radio (CR) network. Assuming that the primary channel occupancy follows a Markovian evolution, the channel sensing problem is modeled as a Partially Observable Markov Decision Process (POMDP). We assume that each SU can sense only one channel at a time by using...
To reduce the excessive amount of computation of traditional motion estimation (ME) algorithm, the diagonal match criterion (DMC) was proposed. DMC brings 75% reduction of computation Complexity and just 2.08% reduction of performance (PSNR) compare with traditional ME algorithm. What’s more important is that beside low, the performance reduction is very stable. And this makes DMC a valuable criterion...
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