Implementation Of QC-LDPC Decoder With High Throughput

Low-Density Parity-Check Code is a kind of channel code with near Shannon performance, which can achieve outstanding performance even under the extremely low singal to noise ratio. More and more applications begin to use LDPC code. High-speed data transfer is a key technology in the future communication systems.This paper first briefly introduces the LDPC code, including the historical development, the merit, the present situation, the classification, the construction of validation matrix, the encoding algorithm, the basic decoding algorithm, the performance analysis method and the initialization question of decoding algorithm, and realizes the fast coding based on LU decomposition. Then, this paper focuses on the algorithm which is realized on the LDPC high speed decoder, including the construction of the flexible structure calibration matrix, the decoding algorithm whose order of complexity is revised, the full-parallel architecture and the logical resource multiplying, and carries on analysis to the advantages; and further, based on various decoding algorithm, this paper proposes an improved Single BP-Based algorithm and analyzes simultaneously the complexity of the various decoding algorithms. Through simulation, the results shows the performance of the improved Single BP-Based algorithm can get close to the performance of BP-Based algorithm for as long as chooses suitable parameters and reduces complex situation, and it is more suitable to be implemented for hardware. Finally, this paper gives the design proposal of the accurate circulation low density parity check code high speed decoder, it takes improved Single BP-Based algorithm based on Shift transformation of matrix H , and the largest number of iterations is 20 times. Last, we carry on the simulation in the software platform.