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Noise-like Chirp Spread Spectrum Signal Design and Fast Acquisition Method

A spread spectrum signal and noise technology, applied in electrical components, transmission systems, etc., can solve the problems of poor real-time performance and long acquisition time of traditional pseudocode, and achieve the effect of improving frequency utilization and high transmission efficiency.

Active Publication Date: 2017-07-11
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0004] The purpose of the invention is to utilize the time-frequency coupling characteristics and anti-Doppler frequency deviation characteristics of CNW to propose a design and fast capture method based on the noise-like Chirp base spread spectrum signal. Compared with traditional methods, this method solves the problem of Under the condition of large frequency offset, the traditional pseudo code takes a long time to capture and has poor real-time performance

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  • Noise-like Chirp Spread Spectrum Signal Design and Fast Acquisition Method

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[0041] The technical solutions of the present invention are explained below in conjunction with the accompanying drawings and examples.

[0042] The present invention proposes a design and fast acquisition method of a CNW-based spread spectrum signal such as image 3 shown. The transmitting end uses quadrature modulation to send out the data symbols and the reference signal (CNW) simultaneously. Wherein, the co-direction branch (I path) of quadrature modulation sends data symbols, and the quadrature branch (Q path) of quadrature modulation sends CNW signals. At the receiving end, after the receiver uses CNW to perform fast synchronization of data symbols and Doppler frequency offset estimation, the obtained Doppler frequency offset estimation value can be used to perform frequency offset compensation for data symbols, so that the receiver system can quickly switch into the tracking phase.

[0043]Combining with the definition and properties of CNW matched filtering, the pri...

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Abstract

The invention relates to a method for designing and rapid capturing of Chirp Noise Waveform (CNW) spread-spectrum signals, and belongs to the technical field of wireless communication. By utilizing a time-frequency coupling characteristic and a Doppler frequency offset resisting characteristic of the CNW signals, PN code acquisition and carrier wave Doppler frequency offset estimation can be accomplished at the same time just through one-dimensional search in a time domain. The method comprises the steps of: transmitting data symbols and CNW signals respectively in paths I and Q at the same time by a transmitting end by utilizing orthogonal modulation; matching the CNW signals at a receiving end by utilizing two groups of matching filters, and estimating time delay and Doppler frequency offset. Compared with the prior art, the method for designing and rapid capturing of the CNW spread-spectrum signals, disclosed by the invention, can enhance safety of communication transmission efficiently, increase frequency utilization rate, greatly reduce signal capturing time; requirements on communication real-time performance also can be met while the relatively high transmission efficiency is obtained.

Description

technical field [0001] The invention proposes a noise-like Chirp signal-based spread spectrum signal design and fast acquisition method, which belongs to the technical field of wireless communication. Background technique [0002] In space-based measurement and control communication, in order to increase the communication transmission rate, the tracking and digital relay satellite system increases the carrier frequency band to the Ka frequency band. During the Ka-band TT&C communication, the TT&C aircraft usually flies at the first cosmic speed, and the carrier Doppler frequency deviation will be as high as ±800kHz. Since the autocorrelation performance of the traditional direct sequence spread spectrum signal is greatly affected by the Doppler frequency offset (the Doppler tolerance is only 1 / 2 of the reciprocal of the correlation time), the acquisition process requires a two-dimensional search of frequency and time delay. At present, the fastest capture method also takes ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7075
Inventor 郇浩冯楚莹吕品陶然
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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