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Method and device for correcting frequency deviation

A frequency offset correction and frequency offset estimation technology, applied in the field of mobile communication, can solve problems such as low accuracy and inability to meet mobile communication systems, and achieve the effects of improving performance, high estimation accuracy, and low computational complexity

Active Publication Date: 2008-12-17
ZTE CORP
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Problems solved by technology

[0009] The purpose of the present invention is to propose a method and device for frequency offset correction suitable for EDGE systems, to overcome the shortcomings of the prior art that the accuracy is not high and cannot meet the requirements of mobile communication systems, especially EDGE systems

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  • Method and device for correcting frequency deviation
  • Method and device for correcting frequency deviation

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Embodiment Construction

[0036] The specific implementation of the method of the present invention will be further described in detail below in conjunction with the accompanying drawings. The above and other objects, features and advantages of the present invention will be apparent to those skilled in the art from the description of the method of the present invention.

[0037]The method of the present invention comprehensively considers the performance, stability and operation speed of the 8PSK demodulation system, and proposes a frequency offset correction algorithm with relatively low computational complexity, which solves the problem caused by the frequency offset in the EDGE system. The influence of unstable demodulation performance. The invention has low calculation complexity, relatively high frequency offset estimation accuracy, and can improve the performance of the baseband demodulation system.

[0038] figure 1 It is a structural diagram of receiver demodulation implementation in EDGE sys...

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Abstract

The frequency deviation correcting method and device is suitable for EDGE system. The method includes turning the received signal, delay conjugate multiplying the turned and synchronized training sequence signals, reading out the weighted and averaged coefficient from the memory and weighting and averaging the result of delay conjugate multiplying for several times, calculating the angle of the weighted and averaged value and maintaining the frequency deviation estimating angle value of the time slot, and performing frequency deviation correction based on the frequency deviation estimating angle value. The device includes delay conjugate multiplying module, multiple weighting and averaging module, angle calculating and averaging treatment module, several time slot averaging module and frequency deviation correcting module. The present invention can generate reliable frequency correcting signal and improve the automatic frequency tracking performance and demodulation system stability.

Description

technical field [0001] The invention belongs to the field of mobile communication, and in particular relates to a frequency offset correction method and device suitable for EDGE systems. Background technique [0002] As the second generation mobile cellular communication system, GSM has been widely used all over the world. However, with the development of mobile communication technology and the diversification of services, people's demand for data services continues to increase. In order to meet people's needs, the GSM system that mainly supports voice services has proposed two high-speed data service models in its PHASE2 and PHASE2+ specifications, namely HSCSD (High Speed ​​Circuit Switched Data) based on high-speed data bit rate and circuit switching and GPRS (General Packet Radio Service) based on packet-switched data. Although HSCSD and GPRS adopt the multi-slot operation mode, which has improved the data transmission rate to a certain extent, they still use the GMSK ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/12
Inventor 熊岗倪萌
Owner ZTE CORP
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