Study on Joint Frame Synchronization and Frequency Bias Estimation Algorithm for Tropospheric Scattering Channels
Aimed at the multipath fading and frequency offset of transmitter and receiver ends in tropospheric scattering commu-nication,a joint frame synchronization and frequency offset estimation algorithm for tropospheric scattering channels is studied.A new synchronous frame structure for tropospheric scattering communication is designed,it adds a cyclic PN sequence before the frame synchronization information to assist the decision,it can improve the probability of signal starting point acquisition in fading channels.A partial correlation frequency domain is used to capture algorithm based on FFT transformation,search for the maximum correlation value and frequency offset index,and then complete the frame synchronization and frequency offset estimation.The joint frame syn-chronization and frequency offset estimation algorithms are implemented under the influences of multipath fading and frequency offset;Simulation results show that in a scattering channel with a fading rate of 5 Hz and frequency offset of 1 000 Hz,the probability of cor-rectly capturing the frame synchronization information still reaches over 90％at a signal-to-noise ratio of-4 dB,and the frequency offset estimation deviation is within 0.4 Hz.
万方数据
维普
