| 摘要: |
| 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。 |
| 关键词: 正交频分复用 盲接收 码速率识别 二次谱线生成 |
| DOI：10.3969/j.issn.1001-893X. |
|
| 基金项目: |
|
| A Symbol Rate Recognition Method Based on Regenerated Spectrum Lines |
| PENG Bo,XIONG Gang |
| (The 30th Institute of China Electronics Technology Corporation,Chengdu 610041,C
hina) |
| Abstract: |
| 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. |
| Key words: orthogonal frequency division multiplexing (OFDM) blind receiving symbol rate recognition regenerated spectrum lines |
《电讯技术》编辑部 