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Frequency Offset Estimation Method for Burst Signals with High Dynamic Frequency and Large Frequency Offset

A technology for burst signal and frequency offset estimation, which is applied to the shaping network and baseband system components in the transmitter/receiver. The effect of large frequency offset search range, strong dynamic adaptability, and high frequency offset estimation accuracy

Inactive Publication Date: 2018-07-13
中国人民解放军理工大学通信工程学院卫星通信军队重点实验室
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Problems solved by technology

However, there are few studies on the estimation of Doppler change rate at present, and there is no effective method for frequency offset estimation of high dynamic communication

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  • Frequency Offset Estimation Method for Burst Signals with High Dynamic Frequency and Large Frequency Offset
  • Frequency Offset Estimation Method for Burst Signals with High Dynamic Frequency and Large Frequency Offset
  • Frequency Offset Estimation Method for Burst Signals with High Dynamic Frequency and Large Frequency Offset

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Embodiment Construction

[0049] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0050] In the embodiment, the structure of the burst signal frame includes two parts: a pilot segment and a data segment. For the structure, see figure 1 . The pilot segment is mainly used for burst signal acquisition and coarse frequency synchronization, and it can be a single-tone pilot or other forms of pilot. The length of the pilot segment is N p , N p The size of is related to the working signal-to-noise ratio threshold and the accuracy requirements of frequency coarse synchronization estimation. The lower the working signal-to-noise ratio threshold, the higher the accuracy of frequency offset estimation, then N p The larger the value is.

[0051] For the frequency offset estimation process of high dynamic and large frequency offset burst signals, please refer to figure 2 . First, burst frame capture is performed, and after the ...

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Abstract

The present invention provides a frequency offset estimation method for burst signals with high dynamic and large frequency offset, including burst frame capture, Doppler change rate estimation and correction, basic frequency offset estimation and Doppler frequency offset estimation, burst signal frame It is composed of a pilot frequency segment and a data segment, and the receiver uses the pilot frequency segment to realize frequency offset estimation. First, the burst frame capture is realized by the threshold comparison method; then the pilot data is segmented, and the Doppler change rate is estimated by a DFT-assisted hierarchical iterative method, and the Doppler change rate estimate is used for the dynamics of the pilot segment Compensation; then, DFT-assisted basic frequency offset estimation is performed on the dynamically corrected signal; finally, the frequency offset of each symbol in the burst signal frame is jointly estimated by combining the estimated value of the Doppler change rate and the estimated value of the basic frequency offset. The data segment is compensated by using the frequency offset estimation result, so that the data segment has a small frequency change rate and residual frequency offset, which facilitates the realization of bit synchronization, frame synchronization and carrier synchronization.

Description

technical field [0001] The invention relates to a receiver synchronization technology, in particular to a method for estimating a frequency offset of a burst signal under the condition of high dynamic and large frequency offset, and belongs to the technical field of wireless communication. Background technique [0002] Burst communication is a common communication application mode, such as position reporting of aircraft and other flight carriers, reporting of data collected by sensors, etc. When there is relative motion between the two parties in communication, and there is a large radial velocity and acceleration, for a higher carrier frequency, the signal will generate a larger Doppler frequency deviation and frequency change rate. For example, in the low-orbit satellite communication system, the satellite moves around the earth at a high speed, has a large speed and acceleration, and the carrier frequency is high (GHz order), the Doppler frequency deviation generated can ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L25/03
Inventor 朱宏鹏杜锋李志强李广侠程剑常江张北江张剑朱银霞云飞龙程磊雷旺春
Owner 中国人民解放军理工大学通信工程学院卫星通信军队重点实验室
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