Lookup table-based QC-LDPC serial encoder in CDR

Abstract

The invention relates to a scheme of solving serial encoding of QC-LDPC codes of four different code rates in a CDR system, and is characterized in that a serial encoder of the QC-LDPC codes of the system mainly comprises four parts, i.e., a register, an index encoder, a lookup table and a b-bit two-input XOR gate. The QC-LDPC serial encoder provided by the invention is compatible with multiple code rates, can effectively reduce resource needs under the condition of keeping the encoding speed unchanged, and has the advantages of simple control, small resource consumption, small power consumption, low cost and the like.

Description

technical field [0001] The invention relates to the field of digital broadcasting, in particular to a serial realization method of a QC-LDPC code encoder in a CDR system. Background technique [0002] Since various distortions and noises in the transmission channel will interfere with the transmitted signal, bit errors in the digital signal will inevitably occur at the receiving end. In order to reduce the bit error rate, channel coding technology needs to be adopted. [0003] Low-Density Parity-Check (LDPC) codes have become a research hotspot in the field of channel coding because of their excellent performance of approaching the Shannon limit. The quasi-cyclic LDPC (Quasic-LDPC, QC-LDPC) code is a special LDPC code, and its encoding can be realized by using a shift register-adder-accumulator (Shift-Register-Adder-Accumulator, SRAA). [0004] The SRAA method uses the generator matrix G for encoding. The generator matrix G of the QC-LDPC code is composed of a×t b×b order...

AI Technical Summary

Problems solved by technology

When implemented by hardware, more memory and registers are required, which will inevitably lead to high equipment cost and high power consumption

Images