| In recent years,with the rapid growth of vehicle ownership per capita and the wide popularization of artificial intelligence technology,automatic driving technology is constantly developing.As an important part of the automatic driving technology,the Internet of vehicles communication technology is constantly pushing forward,in which the efficient transmission and low-power signal detection technology is an important research content.This paper studies a scheme of efficient transmission and low-power signal detection and reception in the Internet of vehicles from two aspects of transmission and reception.Based on the sparsity of the signal,this paper proposes the compressed sensing signal reconstruction technology to detect the low duty cycle signal in the system.Then,the receiving device only does Fourier transform on this part of the signal for subsequent processing.The processed signal is sent to the multi-user detection module for receiving.For data transmission and reception,this paper proposes a design method of non-orthogonal access codebook based on spatial coupling expansion,which can flexibly and rapidly generate large structure non-orthogonal access codebook of Internet of vehicles through matrix cyclic shift replacement of original model graph,so that it can effectively combat the block fading channel.And because of the use of non-orthogonal multiple access technology,the Internet of vehicles communication system can carry more users with less bandwidth,improve the information rate and complete the data transmission in a short time.According to the characteristics of the transmission codebook,this paper selects the iterative multiuser detection algorithm to receive and decode the data,which further compresses the start-up time of the receiving device and reduces the power cost.In this paper,the detection performance of low duty cycle signal reconstructed from compressed sensing signal is analyzed with the help of missed detection probability curve and false detection probability curve,and the performance of non-orthogonal transmission codebook and iterative multi-user detection algorithm is analyzed with the help of symbol error rate curve.The simulation results show that the above scheme is feasible,which can effectively improve the transmission efficiency of the system,reduce the power loss,and has good bit error performance. |
