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Full-digital receiving method of direct spread MSK signal

A receiving method and an all-digital technology, applied in transmission systems, electrical components, etc., can solve the problems of small Doppler frequency offset capture range and inapplicability, so as to reduce capture time, meet application requirements, and reduce development difficulty and cost Effect

Active Publication Date: 2015-12-09
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0004] G.J.R.Povey and others first proposed an acquisition model based on the combination of digital partial matched filter and FFT algorithm (PMF-FFT). Although this method alleviates the influence of Doppler frequency offset on the acquisition threshold to a certain extent, and realizes Two-dimensional capture of pseudocode phase and carrier frequency offset, but this method is mainly suitable for MPSK signals, and the capture range of Doppler frequency offset is small, and it is still not applicable in high dynamic environments

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  • Full-digital receiving method of direct spread MSK signal
  • Full-digital receiving method of direct spread MSK signal
  • Full-digital receiving method of direct spread MSK signal

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Embodiment Construction

[0026] The input intermediate frequency signal of the present invention can be expressed as

[0027]

[0028] Among them, γ i is the transmitted i-th spread data symbol, with γ i =±1, d i is the sent data sequence, c i is a pseudocode sequence, |i| in N It is the |i| modulo N operation, indicating the current chip number, N is the spreading code period, T c =T / M is the chip width of spreading code, and M is spreading factor, and T is the data symbol width before spreading, f c =1 / T c is the spreading code rate, f I is the intermediate frequency, ε is the number of chips that differ between the received pseudo-code signal and the local pseudo-code, εT c is the phase difference between the received pseudo-code signal and the local pseudo-code, θ is the initial phase of the waveform function at the moment of signal reception, and θ and ε satisfy a certain corresponding relationship, namely is the initial phase of the carrier function at the moment of signal rece...

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Abstract

The invention provides a full-digital receiving method of a direct spread MSK signal. The full-digital receiving method comprises constructing the direct spread MSK signal into an approximate direct spread BPSK signal, acquiring the constructed approximate direct spread BPSK signal by use of a two-dimensional combined acquisition algorithm of pseudo-code phases and carrier Doppler frequency shift based on Doppler effect correction-FFT, tracking the acquired pseudo-code phases and carrier phases, and performing processing, such as de-spreading, demodulation and detection, on a synthesized signal to recover transmitted data.

Description

technical field [0001] The present invention relates to the technical field of digital communication, and the present invention relates to a digital communication technology, in particular to an all-digital receiving method of a direct spread MSK signal. Background technique [0002] At present, the spread spectrum technology is mostly based on BPSK and QPSK modulation methods. In the application fields with severe nonlinear distortion, Doppler frequency shift and multipath fading, the direct spread BPSK / QPSK system cannot be applied. The direct spread MSK signal combines the advantages of low interception, multi-user random site selection, and anti-interference of the spread spectrum system with the constant envelope of the minimum frequency shift keying signal, high spectrum utilization, energy concentration, and fast sidelobe attenuation , low out-of-band radiation power, and insensitivity to nonlinear distortion, etc., so it has been widely used in tactical data links, c...

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Application Information

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IPC IPC(8): H04B1/7075H04B1/7087
Inventor 袁美娟蔡雨琦蒋芸茹鲍昱蒙孙红磊施镇峰谢仁宏芮义斌郭山红李鹏
Owner NANJING UNIV OF SCI & TECH
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