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Satellite communication method and system with aliasing of different communication system signals

A communication system and satellite communication technology, applied in the field of satellite communication, can solve the problems of a large amount of bandwidth resources and low spectrum utilization efficiency

Active Publication Date: 2015-01-07
TSINGHUA UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In traditional communication methods, the signals of different communication systems are based on the frequency division multiple access (FDMA) mode, that is, the signals of the above two different systems are completely separated in frequency spectrum without aliasing, resulting in the system requiring a large amount of bandwidth resources , the spectrum utilization efficiency is extremely low

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  • Satellite communication method and system with aliasing of different communication system signals
  • Satellite communication method and system with aliasing of different communication system signals
  • Satellite communication method and system with aliasing of different communication system signals

Examples

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example 1

[0097] The signal 1 is a CDMA signal, and the signal 2 is a MF-TDMA signal; the spreading ratio of the CDMA signal is 100, the number of users is 10, the signal duration of the MF-TDMA signal is 1 ms, and the received power spectral density ψ(u 1 ) is -90dBm / MHz, bandwidth BW 1 10MHz, carrier frequency f 1 is 14.5GHz, the signal duration of the multi-user CDMA signal is 1ms, and the power spectral density ψ(u 2 ) is -96dBm / MHz, bandwidth BW 2 21MHz, carrier frequency f 2 It is 14.505GHz; amplitude estimation adopts maximum likelihood estimation, frequency offset and phase estimation adopts phase-locked loop estimation method, time delay estimation adopts correlation function estimation method, and different system spectrum aliasing signal reception demodulation based on iteration proposed by the present invention The effect diagram of the comparison between the method and the traditional non-iterative direct reconstruction interference cancellation signal separation demodul...

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Abstract

The invention discloses a satellite communication method and system with aliasing of different communication system signals, and belongs to the technical field of satellite communication. The method comprises the following steps: at a transmitting end, accessing signals of different communication systems in the same frequency band range in an aliasing manner, and transmitting the signals; and at a receiving end, separating and demodulating two paths of aliasing signals of different communication systems based on an interference elimination thought, and continuously increasing the demodulation accuracy of each path of signal by using an iteration structure and signal characteristics. The system comprises an accessing and transmitting system and a receiving and demodulating system for two types of signals of different communication systems. Through adoption of the satellite communication system and method, aliasing accessing-transmitting and demodulating-receiving of various signals of different communication systems are supported in a limited frequency band range, and very high anti-intercepting performance is realized.

Description

technical field [0001] The invention belongs to the technical field of satellite communication, and in particular relates to a satellite communication method and system in which signals of different communication systems are mixed. Background technique [0002] In some specific satellite communication systems, there is an intermediate station type, which can simultaneously receive signals from the ground center station and from the user terminal using different communication systems and transparently forwarded by the satellite, and the ground center station can also receive signals from the intermediate station and the user terminal. The signals of user terminals that adopt different communication systems and are transparently forwarded by satellites, for example, are limited by the design requirements of satellite systems. Signals from ground center stations and intermediate stations usually use MF-TDMA (Multi-Frequency Time Division Multiple Access) Access) communication s...

Claims

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Application Information

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IPC IPC(8): H04B7/185H04B1/7107
CPCH04B7/1851
Inventor 匡麟玲顾娜陆建华倪祖耀
Owner TSINGHUA UNIV
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