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In this paper a new decoding algorithm for low density parity check (LDPC) codes based on bit flipping (BF) is proposed. In the proposed algorithm, the BF criterion benefits the data correlation between the decoded and received signal in current and previous stages. The proposed algorithm also degrades the decoding probability of one code word to another one in the same codebook. Simulation results...
In this paper three different scenarios in wide band spectrum sensing have been studied. While the signal and noise statistics are supposed to be unspecified, random matrixes have been utilized in order to estimate the noise variance. These scenarios are: 1-Number of subbands is specified and there is enough information regarding being used or being unused for each of them. 2-Number of subbands is...
A Cognitive radio (CR) observes the environment through a combination of inputs from physical and MAC as well as user needs. These measureable parameters are usually referred as “meters”. Meters can provide the CR with an information base upon which to make decisions. Spectrum sensing is one of the most challenging issues in cognitive radio systems. Several algorithms and techniques to improve them...
Cognitive radio is defined as a paradigm for wireless communication in which either a network or a wireless node changes its transmission or reception parameters to communicate efficiently avoiding interference with the other users. Cognitive Radio (CR) introduces the idea of system awareness and intelligence adaptability in order to provide more efficient spectrum utilization especially in spectrum...
Cognitive radio is defined as a paradigm for wireless communication in which either a network or a wireless node changes its transmission or reception parameters to communicate efficiently avoiding interference with the other users. Cognitive Radio (CR) introduces the idea of system awareness and intelligence adaptability in order to provide more efficient spectrum utilization especially in spectrum...
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