Multi-stage framework based OQPSK signal big-frequency-offset carrier synchronization method

A technology of carrier synchronization and large frequency offset, applied in the field of OQPSK, can solve the problems of small phase jitter, mutual interference between carrier phase synchronization and clock synchronization, etc., achieve accurate estimation, provide estimation accuracy, and control method is simple and effective.

Inactive Publication Date: 2017-12-15
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for OQPSK signal carrier synchronization with large frequency deviation based on multi-level architecture, which solves the problem of mutual interferenc

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  • Multi-stage framework based OQPSK signal big-frequency-offset carrier synchronization method
  • Multi-stage framework based OQPSK signal big-frequency-offset carrier synchronization method
  • Multi-stage framework based OQPSK signal big-frequency-offset carrier synchronization method

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Embodiment Construction

[0042] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0043] combine figure 2 , a carrier synchronization method for OQPSK signals with large frequency offsets based on a multi-level architecture, including using the iterative delay multiplication forward frequency estimation method to perform rough estimation of the carrier frequency to achieve fast carrier locking; for the residual frequency offset phase, a combination of carrier The joint estimation method of synchronization and bit synchronization realizes the simultaneous estimation of carrier phase and bit information, proposes a deconvolution method to eliminate the 180-degree integral multiple ambiguity of carrier phase, and uses an automatic sliding window accumulation method to realize accurate estimation of carrier phase.

[0044] Specifically include the following steps:

[0045]Step 1: When roughly estimating th...

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Abstract

The invention provides a multi-stage framework based OQPSK signal big-frequency-offset carrier synchronization method. The multi-stage framework based OQPSK signal big-frequency-offset carrier synchronization method comprises the steps of performing rough estimation of a carrier frequency by utilizing an iterative time delay multiplication forward frequency estimation method so as to realize rapid locking of the carrier; realizing synchronous estimation of a carrier phase and bit information by adopting a joint estimation method of combining carrier synchronization with bit synchronization for residual frequency offset phase positions; and eliminating 180-degree integral multiple ambiguity problem of the carrier phase by using an unwinding and unfolding method, and realizing precise estimation of the carrier phase by adopting an automatic sliding window accumulation method. The problem of mutual interference between carrier phase synchronization and clock synchronization in existing OQPSK modulation is solved, big-frequency offset rapid capture of the carrier frequency is realized at the same time, and extremely small phase jitter exists after the capture.

Description

technical field [0001] The invention relates to the field of OQPSK, in particular to a method for synchronizing carriers with large frequency offsets of OQPSK signals based on a multi-level structure. Background technique [0002] OQPSK is a constant-envelope digital modulation technique, and the quadrature branch symbol and the in-phase branch symbol are offset in time by a bit interval, that is, half a symbol period. The OQPSK signal eliminates the radian deflection phenomenon of adjacent symbols. In the actual communication system with limited bandwidth, the envelope fluctuation is small. After passing through the nonlinear power amplifier, there will be no obvious power spectrum sidelobe growth effect, and it has high spectrum utilization and High power utilization features. [0003] OQPSK signal usually adopts coherent demodulation mode, in order to obtain good receiving performance and communication quality, it should realize accurate carrier synchronization as much a...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L27/20
CPCH04L27/20H04L27/2657H04L27/2668
Inventor 张光山刘磊王振兴张一民郭荣斌
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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