Interference Suppression System for Range Finder Based on Combined Compressed Sensing and Receive Diversity

Abstract

The invention relates to a compression sensing and reception diversity combined range finder interference suppression system. The compression sensing and reception diversity combined range finder interference suppression system comprises an equalizer, a down sampler, a demapper and a demodulator which are connected in series with one another sequentially; the compression sensing and reception diversity combined range finder interference suppression system is further provided with R receiving branches which receive the same signal and a maximal ratio combiner which is connected with the output ends of the R receiving branches and is used for combining the output signals of the R receiving branches, wherein R is an integer greater than 1; the output end of the maximal ratio combiner is connected with the input end of the equalizer; and the output end of the demodulator is the output end of the system. With the compression sensing and reception diversity combined range finder interference suppression system of the invention adopted, the interference of range finder pulse signals on an orthogonal frequency division multiplexing receiver can be effectively inhibited in an L-band aeronautical communication system reverse link, and the transmission reliability of the L-band aeronautical communication system reverse link can be significantly improved.

Description

technical field [0001] The invention relates to a reverse link transmission method of an L-band digital aviation communication system. In particular, it relates to a range finder interference suppression system that can significantly improve the transmission reliability of the reverse link of the L-band digital aviation communication system, which combines compressed sensing and receive diversity. Background technique [0002] The civil aviation broadband aviation data link is used to provide high-speed voice and data communication services between civil aviation aircraft and ground base stations. The broadband aviation data link is an important part of the civil aviation aviation telecommunication network and one of the important infrastructures of the civil aviation future air traffic management system. In 2004, the International Civil Aviation Organization proposed a candidate technical solution for the ground-air data link: the L-band digital aviation communication syste...

AI Technical Summary

Problems solved by technology

[0008] Although the pulse extinguishing method and the pulse limiting method can eliminate the pulse interference directly and conveniently, in practical application, this method has the following two problems: the first is that the threshold of the pulse interference signal is not easy to determine, due to the OFDM The peak-to-average ratio of the signal itself is relatively high, and it is usually difficult for the receiver to determine the pulse extinction threshold, which will lead to a decrease in receiver performance

The second problem is that after the receiver uses pulse extinguishing or clipping, the OFDM receiver will generate inter-subcarrier interference, which will eventually lead to deterioration of receiver performance.

However, there are still two problems in this method. The first pulse extinction threshold is not easy to determine, and the computational complexity of the reconstruction and compensation of inter-subcarrier interference in the second iteration is relatively high.

[0010] Although the pulse interference suppression method of compressed sensing can effectively reconstruct high-intensity pulse interference, there is a problem with this method. After the pulse signal is reconstructed, residual interference will be generated and the residual interference will significantly deteriorate the performance of the receiver and affect the transmission chain. road reliability

Images