Research On Synchronization And Channel Estimation Technology Of High Speed ​​VANET System

VANET system works under the high speed mobile environment which both transmit sides are in moving state, the signal transmission is affected by the large doppler frequency shift. This article is mainly focus on the channel estimation technology of the VANET high-speed mobile environment, analyzed the challenge of the VANET system under the environment of high-speed mobile. Aiming at the high-speed mobile environment of large characteristics time-varying wireless channel characteristics, on the basis of the existing FFT transform domain interpolation channel estimation algorithm and channel estimation algorithm based on decision feedback data, this paper proposes a new channel estimation algorithm based on partly decision feedback and reduce the error accumulation. The new algorithm integrated the advantages of the existing algorithm to overcome the drawback that wrong data can pass easily and accumulate in decision feedback channel estimation algorithm, which can increase the estimation accuracy of channel characteristics and optimize the overall performance of the communication system. And through the simulation under different speed and different signal-to-noise ratio, this paper analyzed the improvement of the performance of channel estimation algorithm. Simulation results show that the proposed algorithm can well resist the time-varying channel and noise on the influence of the received signal. After the equalization The performance of the new algorithm than the traditional decision feedback algorithm improved the performance of the3～6dB, and be able to carry on the effective tracking to the rapidly changing channel.