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A Precise Frequency Offset Estimation Method for Burst Spread Spectrum Weak Signals

A technology for frequency offset estimation and weak signal, applied in the field of spread spectrum communication, it can solve the problems of low working signal-to-noise ratio and carrier synchronization, and achieve the effect of increasing the accuracy and the ability of frequency offset estimation.

Active Publication Date: 2021-05-28
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0008] The present invention provides a precise frequency offset estimation method for burst spread spectrum weak signals, which mainly solves the problem of carrier synchronization in harsh channel transmission environments such as multipath in DSSS communication systems with extremely low working signal-to-noise ratios

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  • A Precise Frequency Offset Estimation Method for Burst Spread Spectrum Weak Signals
  • A Precise Frequency Offset Estimation Method for Burst Spread Spectrum Weak Signals
  • A Precise Frequency Offset Estimation Method for Burst Spread Spectrum Weak Signals

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Embodiment Construction

[0023] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0024] Low-cost ordinary crystal oscillators are usually used in resource-constrained sensor networks. Due to the frequency offset drift of the crystal oscillator, there is a frequency deviation between the carrier used by the receiving end to recover the signal and the local carrier. The above factors will affect the correct reception of the signal at the receiving end.

[0025] The embodiment of the present invention relates...

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Abstract

The invention relates to a method for precise frequency offset estimation of burst spread spectrum weak signals, comprising the following steps: receiving an input signal for carrier frequency offset estimation, and eliminating pseudo code information in the input signal according to P multipath synchronization positions to obtain P A receiving sequence for eliminating pseudo-random codes; the receiving sequence is divided into groups with a length of n; the packet data with a length of n is respectively pre-averaged; the packet data after the pre-average processing is carried out with a length of L FFT transform , the discrete spectrum obtained after transformation; S(k) is obtained by non-coherent accumulation of the absolute value of the amplitude of the discrete spectrum, and the k value corresponding to the largest spectral line is found in S(k), and the estimated frequency offset is calculated . The present invention significantly increases the ability of frequency offset estimation for weak spread spectrum signals by collecting non-coherently accumulated energy after multipath signal frequency domain transformation, and at the same time increases the frequency offset estimation accuracy through group pre-average technology.

Description

technical field [0001] The invention relates to the technical field of spread spectrum communication, in particular to a precise frequency offset estimation method for burst spread spectrum weak signals. Background technique [0002] The burst spread spectrum signal communication system has two characteristics: 1. Spread spectrum modulation; 2. Burst communication. On the one hand, spread spectrum technology can reduce the energy density and the probability of signal detection. On the other hand, burst signals are not easy to capture and have strong anti-interception capabilities. Therefore, burst spread spectrum communication systems are mostly used in deep space communications and military communications. It is suitable for scenarios where the transmission power is limited, the transmission distance is long, and the electromagnetic interference is serious. [0003] The frequency offset estimation algorithm of the burst communication system working in the environment of ex...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7087
CPCH04B1/7087
Inventor 周磊磊马慧解永生覃荣华汪明亮
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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