基于OFDM的LDPC误码测试系统设计

Design of an LDPC Error Measurement System Based on OFDM

通过比较国内外几种LDPC误码平台测试系统,设计了一种基于OFDM的用于测试LDPC解码误码性能的窄带系统,采用了时域同步正交频分复用调制方式,具有抵抗多径干扰和多普勒频移的能力。该系统用FPGA予以实现,不仅可用于实验室测试,也可用于测试真实多径环境下的误码性能,还能作为通用系统用于其他信道纠错码的解码误码测试。

Compared with several LDPC error floor measurement systems, a narrowband OFDM system is designed for LDPC decoding error measurement. Using time domain synchronous orthogonal frequency division multiplexing （TDS-OFDM） technique, this system can efficiently combat multi-path fading and Doppler frequency shift. Finally, the system is implemented using FPGA. It can be used not only in laboratory tests, but also in real channel measurements. The results show that this system can also be used for error measurements of other channel error-correcting codes.