Frequency offset estimation method for high-dynamic large-frequency-offset burst signals

A technology of burst signal and frequency offset estimation, which is applied to the shaping network and baseband system components in the transmitter/receiver, etc. The effect of large frequency offset search range, low complexity, and adaptability to Doppler frequency offset

Inactive Publication Date: 2015-08-19
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 t

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  • Frequency offset estimation method for high-dynamic large-frequency-offset burst signals
  • Frequency offset estimation method for high-dynamic large-frequency-offset burst signals
  • Frequency offset estimation method for high-dynamic large-frequency-offset burst signals

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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 invention provides a frequency offset estimation method for high-dynamic large-frequency-offset burst signals. The estimation method comprises burst frame capturing, estimation and correction of Doppler changing rate, basic frequency offset estimation, and Doppler frequency offset estimation, a burst signal frame is formed by a pilot frequency segment and a data segment, and a receiver employs the pilot frequency segment to realize frequency offset estimation. Firstly, the burst frame capturing is realized via a threshold comparison method; then the segmentation of pilot frequency data is realized, a DFT-assistant hierarchical iteration method is employed to estimate the Doppler changing rate, and the estimation value of the Doppler changing rate is used for dynamic compensation of the pilot frequency segment; later, DFT-assistant basic frequency offset estimation of signals after dynamic correction is realized; and finally, the estimation value of the Doppler changing rate and the basic frequency offset estimation value are combined to estimate the frequency offset of each symbol in the burst signal frame. According to the frequency offset estimation method, the data segment is compensated by the adoption of the frequency offset estimation result so that the data segment has small frequency changing rate and residual frequency offset, and bit synchronization, frame synchronization, and carrier synchronization can be realized.

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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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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