一种输出格式可控的多码率LDPC编码器实现

Implementation of a Multi-rate LDPC Encoder with Controllable Output Format

针对我国数字电视地面广播标准(DTMB标准)中多码率LDPC码与多符号映射方式相配合的特点,使用Veril-og硬件描述语言设计一种LDPC编码器。该编码器不仅同时支持三种码率LDPC码,而且可以依照标准中采用的五种不同的符号映射方式,选择最佳的码流输出格式,提高了编码器的通用性。最后在Xilinx的XC4VSX35 FPGA芯片上实现该编码器,其测试结果表明该编码器完全可以应用在DTMB发射机中。

For the characteristics of DTMB which adopts multi-rate LDPC codes associated with multi-patterm of symbol-mapping,a LDPC encoder is designed using Verilog hard description language.The encoder not only supports triple-rate LDPC codes but also can be chosen in optimal output format according to five different symbol-mapping patterms in DTMB,which improves the generalization of encoder.The encoder is implemented in XC4VSX35 FPGA of Xilinx,and the experimental results indicate this encoder can be used in DTMB transmitter system.