Research On NON-Binary-LDPC Decoding Algorithm

The technology of NB-LDPC is very popular recent years in the field of mobile communication.Theprocessofthecalculationincheck-node-messageand variable-node-message would occupy large amount of computing resource and the large number of iteration would lead to the occupation of logical unit during decoding,the inaccurate calculation of check-node-message and variable-node-message would lead to the degradation of error correction performance in the decoding algorithm,both logical unit and error correction performance would degrade the communication systems performance.This paper mainly studies the complexity suppression algorithm and error correction performance exaltation algorithm in NB-LDPC system.The proposed algorithm are verified by building the LTE simulation platform,the details are as follows:?1?A extended hamming-distance based on iterative hard-reliability decoding algorithm is proposed.Considering the existing researches haven't accurately selected the truncation reliability of hard reliability decoding algorithm in the NB-LDPC system,this paper design the new truncation method.The main idea is to extend the elements of the original algorithm in the finite field and the elements with the Hamming distance of the received symbols less than 2 to a Hamming distance less than 3,and then initialize the reliability of the selected elements,which can reduce the impact of insufficient information information.The reinitialization in the decoding iteration is then eliminated.Simulation results show that in?315,252?NB-LDPC system through BPSK modulation,while the noise is Gaussian noise and SNR is 4dB,the BER of the compared method is from the level of10^-2to10^-3while the proposed method can achieve effective transmission at1?10^-4,meanwhile the complexity the proposed method reduces about 53%after comparison and analysis.?2?A truncated hamming-distance based two extra column trellis min-max decoder algorithm is proposed.Considering the existing researches haven't selected the truncation variable-node-message of two extra column trellis min-max decoder algorithm in the NB-LDPC system,this paper design the variable-node-message truncation method.The main idea is to select the elements in the finite field and the elements whose received symbols are less than 3,and then initialize the confidence of the selected elements.This can reduce the influence of elements with a Hamming distance greater than 2,which can greatly reduce the complexity;At the same time,according to the correct number of received symbols in the check equation,the check node message scaling factor is calculated to perform check node message weighting,which can effectively improve the decoding performance.Simulation results show that in?315,252?NB-LDPC system through BPSK modulation,while the noise is Gaussian noise and SNR is 4dB,when the BER is1?10^6-the SNR punishment of the proposed method decreases about 1dB and the complexity the proposed method reduces about67.3%.?3?A complete channel-level TD-LTE simulation platform is build.Aiming at the problem that the physical layer of the existing LTE simulation platform is insufficient,the TD-LTE physical layer link simulation platform is designed according to the 3GPP protocol R9.The platform can simulate the key technology of the mobile communication physical layer,which has good scalability and comparison.High reliability.The simulation platform can verify the algorithm in the physical layer of the communication technology,provide a simulation platform for the improved research of the communication physical layer algorithm,and add the proposed NB-LDPC decoding algorithm to the simulation platform for verification,and propose the decoding algorithm and the original decoding.Performance is improved compared to algorithms.