一种基于二次谱线生成的码速率识别方法

为了提高正交频分复用(OFDM)系统的解调性能,提出了一种用于OFDM系统的码速率识别方法.首先对OFDM信号分段作快速傅里叶变换(FFT)得到信号谱线序列,选择适当的谱线重构为辅助信号序列,再根据该辅助信号序列进行二次谱线生成.通过第二次生成谱线的间隔值与门限值的比较,可实现对码速率的识别.理论分析和仿真试验证明了本方法的有效性.在信噪比大于3 dB时,识别率在90%以上.

A Symbol Rate Recognition Method Based on Regenerated Spectrum Lines

In order to improve the demodulation performance of OFDM systems, a new method is proposed for the recognition of symbol rate.The spectrum lin es of OFDM signals are generated by FFT then chosen appropriately for construct ing the auxiliary signal, and the spectrum lines are regenerated. Furthermore, by compar ing intervals of the regenerated spectrum lines and the threshold, the recogniti on can be performed. This method can work with low SNR. Theoretical analysis and simulation verify the effectiveness of the method. The rate of recognition is over 90% when the SNR is more than 3dB.