Through the analysis of advantages of several gmsk arithmetic and requirement of system processing, the base-band time lag demodulating algorithm based on quadrature demodulation and tms320vc5402 are selected for base-band processing 通过分析gmsk几种算法的优越性以及系统对处理的需求,选择基于正交解调的基带时延检波算法以及tms320vc5402进行基带处理。
After achieving the synchronization of the pn code and carrier, despreading and demodulating the received dsss signal can be executed with the local synchronized code and carrier . so, lots of energy and fund has been expended on it 直接序列扩频系统只有在完成了伪码同步和载波同步之后,才可能用同步的本地伪码和本地载波对接收的扩频信号进行解扩、解调。
The paper also combines the latest ofdm technology to research and design the channel encoding technology and modulating and demodulating technologies of power line communicating system, and gives the simulating results of system design 并结合目前最新的ofdm技术对电力线通信系统中的信道编码技术和调制解调技术进行了研究和设计,并给出了系统设计的仿真结果。
Many kinds of efpi sensors and their demodulation methods were compared . a comparative simple scheme, wavelength modulated / demodulated efpi strain sensing system, was adopted and been used in the new generation fiber optic strain-sensing gauge 分析了光纤法珀应变传感的基本原理和调制/解调方式,通过对几种解调方案的比较,选择了波形分析技术作为实际传感系统的解调方案。
Gmsk is selected as demodulating method for its excellent frequency spectrum characteristics and permanent envelope property . the paper introduces in detail the gmsk demodulation principle, different demodulating algorithm and realizing principle 由于gmsk良好的频谱特性以及恒包络特性,本系统选择gmsk为解调方式,并详细分析了gmsk解调的原理和不同的解调算法以及实现原理。
Gmsk is selected as demodulating method for its excellent frequency spectrum characteristics and permanent envelope property . the paper introduces in detail the gmsk demodulation principle, different demodulating algorithm and realizing principle 由于gmsk良好的频谱特性以及恒包络特性,本系统选择gmsk为解调方式,并详细分析了gmsk解调的原理和不同的解调算法以及实现原理。
A kind of secure communication system scheme is presented, which utilizes vss synchronizing controller to demodulate . amplitude masking modulation and spread spectrum modulation are considered to validate feasibility of the presented scheme 在此基础上,提出了一种基于变结构混沌同步的保密通信系统模型,该模型把一个混沌系统作为加密调制器,其变结构同步控制系统作为解调器。
In this paper, we are going to use high speed digital signal processor, track the carrier wave through the digital phase locked loop, and so to demodulate the modulating signal . it can overcome the difficult problems of the other ways 而我们这里就是准备用高速数字信号处理器,利用数字锁相环实现对载波的跟踪,从而实现调制信号的解调,它能有效克服其他解调方式所遇到的困难。
The adsl soho gateway not only has the adsl modem function but also has the function of application gateway . it not just completes the work that analog signals coming from adsl lines are modulated and demodulated, but also shares the information adsl网关集adslmodem和应用网关于一体,既完成adsl接入的调制解调工作,又在此基础上实现了共享资源,是一种有着广泛应用前景的技术。
(4 ) a method, realizing the fast frequency measurement for dual sinusoidal signals basing on dft and autocorrelation theory, is proposed . firstly, one frequency and its amplitude are measured by dft, with which to demodulate the signals and eliminate the 该方法先用dft估计其中一个信号的频率和幅度,以此频率对信号解调并对消该频率成分,最后利用自相关理论估计出另一个信号的频率。