英语翻译空间光通信要实现高功率、广距离的通信,这就要求发射机激光器的超高速率调制.PPM(PulsePositionModulation)调制由于其较高的功率利用率在空间光通信系统中被广泛应用.PPM调制解调系

Question

英语翻译
空间光通信要实现高功率、广距离的通信,这就要求发射机激光器的超高速率调制.PPM(Pulse Position Modulation)调制由于其较高的功率利用率在空间光通信系统中被广泛应用.PPM调制解调系统应用在空问激光通信中,可以极大的提高系统的抗干扰能力,并采用这种调制方式,以在给定的激光脉冲重复频率下,用最小的光平均功率达到最高的数据传输率,这大大降低了对激光器发射功率的要求.把DSP和FPGA应用到了PPM调制解调系统中.本文的主要内容首先对空间激光通信系统中几种调制技术进行分析及比较,并详细说明了PPM调制方式.提出PPM调制方式是最适合目前空间光通信系统的调制方式.同时也就PPM解调技术展开了讨论,阐述了PPM硬判决解调的优缺点.

Answer 1

Space to realize high power,optical communication,the wide range of lasers require high velocity modulation transmitter.PPM Pulse (due to its Modulation) Modulation them higher power utilization in space optical communication system is widely used.PPM demodulation system applied in the laser communications,ask can greatly increase the anti-interference ability of the system,and adopt the method of laser in a given to pulse repetition frequency,with minimal light reached the highest average power of data transfer rate,which greatly reduces the launch of laser power requirements.The application of digital signal processor (DSP) and FPGA demodulation system to PPM.The main content of this article firstly in the communication systems of spatial laser modulation technique analysis and comparison,and detail the PPM modulation mode.The proposed method is suitable for PPM current space optical communication system of modulation mode.Simultaneously also PPM demodulation technology,this paper discusses the advantages and disadvantages of demodulation PPM hard decision.