Channel Estimation Method for Dedicated Short-Range Communication Based on Compressed Sensing

Abstract

The invention discloses a method for estimating a dedicated short-distance communication channel based on compressed sensing. The method mainly solves the problem that in the prior art, the performance is poor when the frame length is larger. The method comprises the implementation steps that an Applebaum pilot frequency design method is adopted at a sending end to obtain a pilot frequency position and pilot frequency data, and the pilot frequency data are inserted into the sent data according to the pilot frequency position; the sending end sends data after IFFT conversion to a receiving end through a wireless channel; the receiving end conducts FFT conversion on the received data, and then extracts a data symbol at the pilot frequency position; a channel frequency domain response estimated value at the pilot frequency position is obtained according to an LS algorithm; an OMP algorithm is utilized for obtaining a channel frequency domain impulse response estimated value; DFT conversion is carried out on a channel frequency domain impulse response to obtain the channel frequency domain response estimated value. By the utilization of the compressed sensing technology, the sparseness of the wireless channel is fully utilized, the system performance is improved when the frame length is larger, and the method for estimating the dedicated short-distance communication channel can be used for vehicle-mounted communication.

Description

technical field [0001] The invention belongs to the field of wireless communication, and relates to a method for estimating a dedicated short-distance communication channel, which is suitable for vehicle-mounted communication in which the two ends of the transmitting and receiving ends move simultaneously and the moving speed may be very high. Background technique [0002] In November 2011, the IEEE802.11p standard for dedicated short-distance communication was officially promulgated. It is a communication network for vehicles based on the European environment by the US Department of Transportation, especially in applications such as electronic road tolling systems, vehicle safety services, and vehicle-mounted commercial transaction systems. And the planned medium and long distance continues to spread the air interface system plan. The simultaneous rapid movement of both ends of the transceiver in vehicle communication makes the wireless channel environment of the dedicated ...

AI Technical Summary

Problems solved by technology

Many scholars have done a lot of research on channel estimation. American scholar J.A.Fernandez proposed an OFDM symbol intelligent decision scheme without changing the protocol, but its frame error rate is not ideal; Korean scholar WoongCho et al. Researched the channel estimation performance after inserting the intermediate synchronization code in the frame structure of IEEE802.11p, but this changed the protocol; Australian scholar T.Zemen designed an iterative estimator for IEEE802.11p, through the generalized The iteration of the iterative discrete spherical sequence improves the channel estimation performance, but this requires more iterations to meet the performance requirements, and the convergence is poor

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