摘要
将射频技术应用到自由空间光通信具有独到的优势。为了研究自由空间光载射频技术,在四进制频移键控调制解调理论基础上,以自由空间光通信为应用背景,采用仿真,从时域角度对四进制频移键控系统进行了编码及解码研究,并推导了经过高斯噪声和瑞利信道后系统误比特率及信道容量。两种解调法的系统误比特率仿真结果表明,当信噪比为12dB时,过零检测法的系统误比特率达到10^(-15),明显优于相干解调法。
It takes advantages of free space optical communication （FSO） to transmit RF signal, which is proved to have special predominance. In order to research radio over free space optics technology, under the background of FSO, the simulation was adopted to study coding and decoding system based on the theory of 4 frequency-shift keying modulation and demodulation. The error rate and channel capacity after the RF signal passing Gaussian noise and Rayleigh channel were also analyzed. The simulation results on bit error rate（BER） of two demodulation methods show that the zero crossing detection system has the better BER than the coherent demodulation system when the signal-to-noise ratio is 12dB.
出处
《激光技术》
CAS
CSCD
北大核心
2010年第4期466-469,共4页
Laser Technology
基金
国家自然科学基金资助项目(60977054)
国防重点实验室基金资助项目(9140C3601010701)
军队八六三创新计划资助项目(2008AAJ159)
陕西省教育厅科技专项基金资助项目(07JK332)
陕西省自然科学基金资助项目(2007F12)
广东省交通厅科技基金资助项目(2007-26)
关键词
光通信
四进制频移键控
误比特率
信道容量
optical communication
4 frequency-shift keying
bit error rate
channel capacity
