Design of LDPC Decoder Based on Adaptive Code Length

LDPC still receives extensive attention in the field of channel coding because of its superior error correction performance, high throughput and low decoding complexity. Considering the poor adaptability and limited expansibility of traditional LDPC decoder, a design method of LLR-BP decoder based on adaptive code length is proposed. A partial parallel LDPC decoder structure is designed under the ISE 14.7 environment, which adopts the pre-termination iteration strategy and effectively reduces the iteration number of it. And this decoder realizes the complex probability function operation by taking the limit in LLR-BP algorithm that can reduce the complexity of algorithm. Through simulation analysis, the decoder effectively improves the decoding speed, reduces the hardware logic resource share, and solves the decoding problem of multi-code length simultaneously in the premise of ensuring the bit error rate.