Modem applicable to super remote distance scattering link

A modem, ultra-long-distance technology, applied in the field of communication, can solve the problem of serious frequency deviation of ultra-long-distance scattering links, and achieve the effect of overcoming the difficulty of signal reception synchronization, saving logic resources, and quickly establishing synchronization

Active Publication Date: 2017-11-17
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology

The present invention also adopts the demodulation method of secondary spread spectrum plus pilot frequency to effectively solve the problem of serious frequency deviation of ultra-long-distance scattering links, and ensure that the equipment realizes fast and high-precision synchronization establishment and maintenance under harsh channel conditions

Method used

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  • Modem applicable to super remote distance scattering link
  • Modem applicable to super remote distance scattering link
  • Modem applicable to super remote distance scattering link

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Embodiment Construction

[0017] Reference Figure 1 to Figure 3 The present invention is composed of a modulator 1, a demodulator 2, an auxiliary multiplexer 3, an auxiliary demultiplexer 4, an intermediate frequency amplifier 5 and a rubidium clock unit 6. figure 1 It is a block diagram of the electrical principle of the present invention. figure 1 Connect the line.

[0018] Reference figure 1 , At the sending end: the auxiliary multiplexer 3 receives the service data and service clock input by the external service terminal, performs service multiplexing, and sends the multiplexed information code stream and symbol clock to modulator 1; modulator 1 uses symbols The clock performs baseband processing on the information code stream, and performs carrier modulation, and outputs a modulated intermediate frequency signal E. At the receiving end: the intermediate frequency amplifier 5 receives the demodulated intermediate frequency signal F input by the external radio frequency unit, amplifies the intermediat...

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Abstract

The invention discloses a modem applicable to a super remote distance scattering link and relates to a scattering communication system which is remote in communication distance, serious in frequency offset and low in signal to noise ratio in the field of communication. The modem is composed of components such as a modulator, a demodulator, an intermediate frequency amplifier, an auxiliary multiplexer, an auxiliary demultiplexer and a rubidium clock unit. According to the modem, through adoption of a channel coding and decoding technology based on a CCSDS standard, a wireless communication system is applicable to a scattering channel environment with an ultra low signal to noise ratio, thereby ensuring high-reliability transmission of business. According to the modem, a secondary spread spectrum plus pilot demodulation method, a low receiving threshold of devices is ensured, synchronous rapid establishment and keeping of the devices are realized in a high frequency offset state, and the method is especially applicable to high-quality high-reliability transmission of the business on the remote distance scattering communication link under a Rayleigh deep fading channel condition.

Description

Technical field [0001] The present invention relates to a modem suitable for ultra-long-distance scattering links in the communication field, and is particularly suitable for solving the problems of large path loss, serious frequency deviation, and extremely low signal-to-noise ratio of ultra-long-distance scattering communication links, and resists the long-distance Deterioration of channel conditions caused by distance improves communication reliability. Background technique [0002] When the existing scatter modems work under the condition of ultra-long-distance scatter links, the commonly used scatter modulators do not use high-performance encoding methods and cannot effectively combat communication path loss; most of the demodulators use differential demodulation, which is resistant to frequency The partial ability is strong, but the demodulation performance is poor, especially in the ultra-long-distance link of the scattering variable parameter channel. Due to the extremely...

Claims

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Application Information

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IPC IPC(8): H04B1/7073H04L27/00
CPCH04B1/7073H04L27/00
Inventor 毛晶晶石柳陈小溪韩燕杰
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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