ICI self-cancellation communication method and system with high frequency spectrum utilization

Abstract

The invention discloses an ICI automatic elimination communication with high spectrum efficiency. The method comprises the following steps: step 1, sending a subcarrier sequence group X0 (k) composed of N sequences by a sequence generator, wherein k is not smaller than 0 and is not greater than N-1, k is a wave number and N is an even number; step 2, performing modulation processing on X0 (k), performing no processing on odd items, and mapping even items to one half of the difference of adjacent items; and step 3, after the modulation processing, receiving k subcarrier sequence group Y(k) and k+1 subcarrier sequence group Y(k+1) by a receiving end, and performing demapping processing on the two sequence groups: Y' (k)= 2 [Y (k)-Y (K + 1)].

Description

technical field [0001] The invention relates to the technical field of low-orbit satellite communication systems, in particular to a realization scheme for self-elimination of inter-carrier interference with high frequency spectrum utilization in a low-orbit satellite communication OFDM system. Background technique [0002] Satellite communication refers to the communication between two or more earth stations using artificial earth satellites as relay stations to transmit radio waves. Satellite communication occupies an important position in the field of wireless communication because of its advantages such as long communication distance, wide coverage, stable performance, applicable to multiple services, and not subject to geographical restrictions. It has developed rapidly and been widely used, and has become a powerful means of modern communication. [0003] Satellite communication systems can be divided into Geostationary Orbit (GEO), Medium Earth Orbit (MEO) and Low Ea...

AI Technical Summary

Problems solved by technology

Scholars proposed some improved algorithms on the basis of this algorithm to further improve the system's ICI suppression performance, but the problem of low spectrum utilization of the algorithm itself has not been resolved.

Although ICI self-elimination differential coding algorithm [Liu Jiehua, Yang Dongkai, Chang Qing, Zhang Qishan. Research on ICI elimination method of OFDM system based on differential coding [J]. Journal of Electronics and Information Technology, 2007,29(7):1529-1532.] and Data rate self-cancellation algorithm [Zhenchao Wang, Jianping Zhang, and Yanqin Wang. A Novel ICI-SC Scheme in MIMO-OFDM System [C]. International Conference on Communication Signal Processing and Systems, Lecture Notes in Electrical Engineering 246, 2014: 697-706.] improve spectrum utilization to varying degrees, but their suppression is not as good as traditional ICI self-interference cancellation schemes

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