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Multi-Code-Rate Correction Technique with IR-QC-LDPC: An application to QKD
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Multi-Code-Rate Correction Technique with IR-QC-LDPC: An application to QKD
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In this paper, we report an encoding and decoding method for irregular-quasic-cyclic low-density parity-check (IR-QC-LDPC) codes with multi rates. The algorithm is applicable to parity-check matrices which have dual-diagonal parity structure. The decoding adopts normalized min-sum algorithm(NMSA). The whole verification of encoding and decoding algorithm are simulated with MATLAB, if initial bit error ratio is 6% , the code rate of 2/3 is selected, and if the initial bit error ratio is 1.04%, the code rate of 5/6 is selected. We migrate the algorithm from MATLAB to Field Program Gate Array(FPGA) and implement this algorithm based on FPGA. Based on FPGA the throughput of encoding is 183.36Mbps while the average decoding throughput is 27.85Mbps with the initial bit error ratio is 6%.
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