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ICI automatic elimination communication method and system with high spectrum efficiency

A communication method and technology of utilization rate, applied in the field of low-orbit satellite communication system, can solve the problems of low utilization rate of algorithm spectrum and insufficient suppression effect, etc.

Active Publication Date: 2017-05-31
SHANGHAI ENG CENT FOR MICROSATELLITES
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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 [ZhenchaoWang, JianpingZhang, 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 Engineering246, 2014: 697-706 .] improve spectrum utilization to varying degrees, but their suppression effects are not as good as traditional ICI self-interference cancellation schemes

Method used

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  • ICI automatic elimination communication method and system with high spectrum efficiency
  • ICI automatic elimination communication method and system with high spectrum efficiency
  • ICI automatic elimination communication method and system with high spectrum efficiency

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Embodiment Construction

[0042] It can be seen from the background technology that the ICI self-cancellation method adopted by the existing LEO satellite OFDM communication system will reduce the spectrum utilization rate; the inventor conducts research on the problem and thinks that the reason for reducing the spectrum utilization rate is that when the subcarrier sequence is mapped , the spectrum information of part of the subcarrier sequence is lost; the inventor conducted further research on the above problem, and provided an ICI self-cancellation communication method and system with high spectrum efficiency in an embodiment of the present invention.

[0043] Hereinafter, the spirit and essence of the present invention will be further elaborated in conjunction with the drawings and embodiments.

[0044] The high frequency spectrum utilization ICI self-elimination communication method provided by the embodiment of the present invention includes:

[0045] Step 1. The sequence generator sends a subcar...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03
Inventor 马天鸣李世举卢斌马闯
Owner SHANGHAI ENG CENT FOR MICROSATELLITES
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