frequency demodulation
1.Research, in this dissertation, concentrates mainly on the digital automatic gain control (AGC) technique, the highly effective digital wideband receiver structure with high-speed, high-resolution, the real-time digital frequency demodulation technique, the opened-loop frequency trace technique used in FM demodulation, and the design and implementation of PCM/FM Telemetry IF Digitized Receiver and wideband Radar digital receiver, etc.
2.On the condition that the circumstance is bad and interfered strongly underground,it is the most effective and probable for acceleration transducer to diagnose the problem of rolling bearings of transporting machinery with the technology of high frequency resonance demodulation.
3.In order to realize the reliable, accurate demodulation of frequency-shift signal in the strong background noise, a frequency-shift signal demodulation method based on EMD algorithm is proposed and the numerical computer simulation is carried out to illustrate the validity and feasibility of our algorithm in this paper.
4.Investigation and Development of the Frequency-multiplication and Phase-demodulation Circuits for Electronic Handwheel of Mahr891E Gear Measurement Machine
6.As paper aiming at the characteristic of the ASK signal in uninsulated Audio Frequency Track Cir- cuit presents a new algorithm to demodulate the ASK signal -the demodulation algorithm of ZFFT,designs a demodulation system on the basis of TMS320C32 The result of experimentation shows that the system can demodulate the ASK signal reliably It accords with the requirement in locale
7.For the chaotic sample function,a set of orthogonal bases can be used to produce the quadrature signal of the chaotic carrier in the frequency or time domain. In the receiver,the reference signal and its quadrature component are directly correlated with the information-bearing part without FM demodulation.
8.To realize high-speed satellite communication, a scheme of design and implementation of high-speed demodulator for π/4QPSK signal is put forward based on FPGA and ASIC The intermediate frequency (IF) of π/4QPSK signal is 140MHz and symbol rate is 2M～45Mbaud The major parts of demodulator: I-Q demodulation, carrier recovery and timing recovery are discussed in detail, including the selection of devices and the implementation of corresponding algorithms
9.This paper presents a method for processing stripmap SAR data by using spotlight imaging algorithms. This method is based on dechirp demodulation and different characters of input data of stripmap and spotlight IFP. A frequency unfolding approach is also used.
10.Chapter 2: Analyzes all factors influenced on the OFDM coherent demodulation and puts forward an algorithm of carrier frequency offset synthetical estimation for OFDM system in Wireless LAN environment based on IEEE 802.11a OFDM baseband system.
