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Physical layer adaptive ACM synchronization method based on satellite communication

A satellite communication and physical layer technology, applied in the field of satellite communication, can solve problems such as low estimation accuracy, inability to perform stable tracking, large offset frequency, etc., and achieve the effect of low demodulation threshold

Active Publication Date: 2018-09-04
四川安迪科技实业有限公司
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Problems solved by technology

[0004] Problems existing in the existing ACM adjustment: SNR (Signal-Noise Ratio, signal-to-noise ratio) estimation accuracy is low under low noise, the offset frequency after frequency compensation is large, the clock error signal locking speed is slow, and stable tracking cannot be performed And other issues

Method used

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  • Physical layer adaptive ACM synchronization method based on satellite communication

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Embodiment Construction

[0023] Such as figure 1 As shown, a physical layer adaptive ACM synchronization method based on satellite communication includes ACM physical frame sending module 1 and ACM physical frame synchronization receiving module 3, ACM physical frame sending module 1 and ACM physical frame synchronization receiving module 3 through satellite channel 2 in series;

[0024] The ACM physical frame sending module 1 includes an ACM physical framing module 11, a digital up-conversion module 12 and a digital-to-analog converter 13, and the ACM physical framing module 11 is connected in series on the digital up-conversion module 12, and the digital up-conversion The module 12 is connected in series on the digital-analog converter 13, and the ACM physical framing module 11 is the receiving end of the SNR information 10, and the digital-analog converter 13 is the signal output end;

[0025] The ACM physical frame synchronization receiving module 3 includes a signal converter 30 and an ACM infor...

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Abstract

The invention discloses a physical layer adaptive ACM synchronization method based on satellite communication, comprising an ACM physical frame sending module and an ACM physical frame synchronous receiving module, wherein the ACM physical frame sending module and the ACM physical frame synchronous receiving module are connected in series through a satellite channel. The physical layer adaptive ACM synchronization method disclosed by the invention has the advantages of having a simple structure and high SNR estimation accuracy under low noise, effectively reducing the frequency offset after frequency compensation, having a high clock signal locking speed, being able to perform stable tracking and having relatively high practicability.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to a physical layer adaptive ACM synchronization method based on satellite communication. Background technique [0002] In the satellite communication system, ACM (Adaptive Modulation and Coding, Adaptive Modulation and Coding) technology is usually used to adjust the modulation and coding level, modulation and coding strategy according to the channel environment. Single channel single carrier system for communication. [0003] ACM technology establishes a closed-loop control system through the return channel, which is one of the effective measures to improve channel utilization. The basic idea is that the receiving end estimates the channel in real time according to the quality of the received signal, and passes the estimated channel state information through the feedback channel. The transmitter will then dynamically change the coding and modulation methods accord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/185H04L27/00
CPCH04B7/1851H04B7/18519H04B7/18582H04L27/0014H04L2027/0026H04L2027/0053H04L2027/0069H04L2027/0097
Inventor 曾辉
Owner 四川安迪科技实业有限公司
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