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A frequency deviation estimation device and method

A frequency offset estimation and frequency offset technology, applied in the field of frequency offset estimation devices, can solve the problems of high overhead, the estimation accuracy cannot fully meet the high-order modulation, etc., and achieve the effect of large data interval

Inactive Publication Date: 2008-01-09
ST ERICSSON SEMICON BEIJING
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AI Technical Summary

Problems solved by technology

If the joint detection is dedicated to frequency offset estimation, the overhead will be large
Moreover, the estimation accuracy of this method still cannot fully meet the needs of high-order modulation

Method used

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  • A frequency deviation estimation device and method
  • A frequency deviation estimation device and method
  • A frequency deviation estimation device and method

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Embodiment Construction

[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be described in detail below by taking the application of the present invention in TD-SCDMA terminals as an example in conjunction with the accompanying drawings and specific embodiments.

[0033] The present invention uses the Midamble received data of two downlink service time slots to perform channel estimation, and then performs frequency offset estimation according to the channel estimation results, and is suitable for one user to occupy two service time slots at the same time, but does not require each service time slot to be full business.

[0034] The basic principles are as follows:

[0035] When there is no frequency offset, the received Midamble data can be expressed as:

[0036] R=GH+n (1)

[0037] Among them, R is the received data of Midamble, G is the transformation matrix formed by the basic Midamble code, H is the channel impuls...

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Abstract

The method comprises: getting the training sequence data of two time slots; according to the obtained training sequence data and the local training sequence data, making the channel estimation to the corresponding channel impulse response; getting the channel impulse response of identical code portion of two time slots; calculating product of one conjugate transpose and another one in the channel impulse response of said identical code portions of two time slots; according to the product of channel impulse response of said identical code channel portion, calculating the frequency deviation.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, in particular to a frequency offset estimation device and method used in a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) terminal. Background technique [0002] In a wireless communication system, there is always a certain frequency deviation between the carrier frequency and the local crystal oscillator. Only by estimating the frequency deviation as accurately as possible can the frequency deviation adjustment / compensation be performed to achieve a frequency deviation acceptable to the receiver, thereby performing data demodulation. The accuracy of frequency offset estimation will directly affect the demodulation performance, especially the demodulation of high-order modulated signals (such as 16QAM, 64QAM). So how to quickly and effectively estimate the frequency deviation, and then quickly and accurately adjust the frequency deviation is a key part directly r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00
Inventor 牟秀红许百成李燮
Owner ST ERICSSON SEMICON BEIJING
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