摘要
为有效提高短波通信系统的数据传输速率,可采用正交频分复用(OFDM)技术。OFDM是一种特殊的多载波数字调制方案,各子载波之间的正交性使得频谱可重叠从而提高了频带的利用率,同时能有效对抗频率选择性衰落或窄带干扰。采用Simulink建模对窄带OFDM系统进行设计并仿真,仿真结果表明,在3 kHz的带宽内,短波通信系统的数据传输速率能够达到12 800 b/s,而且具有良好的误码性能。
The OFDM technology can be used to improve the data transmission rate of shortwave communication systems efficiently. OFDM is a special multi-carrier digital modulation scheme, in which the frequency spectra can be overlapped by the orthogonality among all the subcarriers, therefore, the availability of frequency band can be improved and the declination of the frequency selectivity or the interference from the narrow band can be withstanded. The narrow-band OFDM system was designed and simulated with the modeling by Simulink. The simulated results indicate that within 3 kHz bandwidth the data transport rate of the shortwave communication system can be increased to 12 800 bps.
出处
《现代电子技术》
2010年第13期14-16,20,共4页
Modern Electronics Technique
