Low signal-to-noise ratio short frame burst communication open loop demodulation method and device

A burst communication, low signal-to-noise ratio technology, applied in the field of demodulation in direct sequence spread spectrum communication, and can solve problems such as digital symbol errors

Active Publication Date: 2018-03-23
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0025] Traditional BPSK coherent demodulation modules usually use phase-locked loops, such as square loops, Costas (Costas) loops, etc., to achieve carrier tracking, but they cannot effectively solve the "inverted π" problem, that is, the resto

Method used

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  • Low signal-to-noise ratio short frame burst communication open loop demodulation method and device
  • Low signal-to-noise ratio short frame burst communication open loop demodulation method and device
  • Low signal-to-noise ratio short frame burst communication open loop demodulation method and device

Examples

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Embodiment Construction

[0101] The device will be described in further detail below in conjunction with examples and accompanying drawings.

[0102] This example takes the direct sequence spread spectrum BPSK communication receiver as an example, and its baseband digital signal processing part is as follows figure 1 shown.

[0103] from figure 1 It can be seen that what enters the device is despread data, and the Doppler frequency offset change rate and Doppler frequency offset two-dimensional search module, fine search module and frame synchronization module of the device are run in sequence to complete the demodulation function, and the data Output to the decoding module of the receiver to complete the decoding.

[0104] The device input data parameter index: symbol rate R s =2.5ksps; initial frequency offset Δf range The unit is Hz. The range of frequency offset change rate ΔΔf is ±6, and the unit is kHz / s.

[0105] The despread data is input to the device, and the prior information of data...

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Abstract

The invention discloses a low signal-to-noise ratio short frame burst communication open loop demodulation method and a low signal-to-noise ratio short frame burst communication open loop demodulationdevice, and belongs to the technical field of direct sequence spread spectrum demodulation technologies. According to the method, a segmented data processing mode is used for firstly demodulating dispreading data, then performing supply-zero FFT to estimate a frequency offset variation rate and frequency offset and perform compensation. A method of exhaustion is used for accurately estimating andcompensating each frequency offset, the polarity of a frame header is used for performing defuzzification on the phase, to complete correct demodulation of the data. Compared with the prior art, themethod and the device provided by the invention overcome the disadvantages that traditional phase-locked loop coherent demodulation devices are fuzzy in phase and slow in convergence speed, the frequency offset and the frequency offset variation rate can be quickly searched and compensated, the phase discrimination and phase correction can be completed, the short time is ensured, and a direct sequence spreading signal can be normally demodulated under the condition of a low signal-to-noise ratio.

Description

technical field [0001] The present invention relates to a carrier phase tracking and coherent demodulation method (hereinafter referred to as the demodulation device), in particular to a low signal-to-noise ratio short-frame burst communication open-loop demodulation method and device, suitable for high dynamics, low signal-to-noise ratio, etc. The invention relates to open-loop search, tracking and symbol coherent demodulation of carrier frequency offset and frequency offset change rate of short-frame burst direct sequence spread spectrum system in the environment, belonging to the field of demodulation technology in direct sequence spread spectrum communication. Background technique [0002] The communication between high-speed aircraft and ground equipment or high-speed aircraft has the characteristics of long communication distance, large link attenuation, and low signal-to-noise ratio, so the direct sequence spread spectrum communication system is often used; and this ki...

Claims

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Application Information

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IPC IPC(8): H04B1/7073H04L27/00H04L27/227
CPCH04B1/7073H04L27/0014H04L27/227H04L2027/0026
Inventor 罗士荀岳平越王帅
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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