| 用FFT对8FSK信号进行解调方法的比较 |
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| 引用本文： | 徐锐.用FFT对8FSK信号进行解调方法的比较[J].通信技术,2003(2):36-37. |
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| 作者姓名： | 徐锐 |
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| 作者单位： | 中国电子科技集团公司第三十研究所,成都,610041 |
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| 摘 要： | 随着DSP技术的发展,快速傅里叶变换(FFT)的应用越来越广泛。利用FFT算法对频移键控(FSK)信号进行频谱分布,通过比较FFT计算结果来确定信号的频率,可以实现对FSK信号的解调。采用MIL-STD-188-141A中的8FSK调制信号作为仿真信号,用MATLAB6.1对解调进行仿真。在提到的三种FFT的检测方案中,在没有频偏的情况下,第一种要较好;但当有频偏存在时,第二种方法较好。
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| 关 键 词： | 快速傅里叶变换 频移键控 比特信噪比 误码率 功率谱密度 |
| 修稿时间： | 2002年9月11日 |
Comparison of FFT- Based Demodulated Methods for 8FSK Signals |
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| Xu Rui.Comparison of FFT- Based Demodulated Methods for 8FSK Signals[J].Communications Technology,2003(2):36-37. |
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| Authors: | Xu Rui |
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| Abstract: | With the development of DSP, the Fast Fourier Transform (FFT) is used widely. The demodulation of FSK signals by Fourier transformation has become available. Detection is based on the output power of the FFT bins. In this paper, the signal is the 8FSK of MIL-STD-188-141A. And the results are simulated by using MATLAB6.1. From the results, we find the first method is better than other two ones when there is no offset, and the second is better than the others when there is offset. |
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| Keywords: | FFT FSK SNR BER DFT |
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