河北科技大学学报2011，Vol.32Issue(1)：34-38,5.
模拟调频电台的调制系数估计
Modulate factor blind estimation in analog FM station
赵汇强 1武春英 2张利强 1张玉萍3
作者信息
- 1. 军械工程学院光学与电子工程系,河北石家庄,050003
- 2. 河北科技大学信息科学与工程学
- 3. 河北科技大学理工学院,河北石家庄,050035
- 折叠
摘要
Abstract
The modulate factor is an important parameter in analog FM station. The instantaneous frequency of the FM signal is the result of module factor and FM signal working together, and the module factor can be calculated by instantaneous frequency. But the calculation precision of instantaneous frequency is easily affected by the noise of the received signal. When the SNR(Signal Noise Ratio) is higher than 20 dB, the relative error between modulate factor and real value will be lower than 1％. The common ways to calculate instantaneous frequency include: time-frequency analysis; short time Fourier transformation and so on. The calculation precision is easily affected by the factors of cross term, window choices and noise.Besides, because of using two-dimension transformation, the calculated amount is larger and the property of real-time is not so good. So a new algorithm of particle filtering is given in this paper, which can reduce the noise and operation amount and improve the precision of estimation. The simulation experiment verifies the efficiency of the algorithm.关键词
FM电台/瞬时频率/调制系数/粒子滤波Key words
FM station/ instantaneous frequency/ modulate factor/ particle filter分类
信息技术与安全科学引用本文复制引用
赵汇强,武春英,张利强,张玉萍..模拟调频电台的调制系数估计[J].河北科技大学学报,2011,32(1):34-38,5.
