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A frequency offset estimation method and device applied to time division synchronous code division multiple access system

A frequency offset estimation and code division multiple access technology, which is applied in baseband system components, shaping networks in transmitters/receivers, etc. The effect of biased estimates

Inactive Publication Date: 2011-11-30
ST ERICSSON SEMICON BEIJING
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Problems solved by technology

But in high-speed mobile scenarios, the estimated range of 300Hz is far from enough

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  • A frequency offset estimation method and device applied to time division synchronous code division multiple access system
  • A frequency offset estimation method and device applied to time division synchronous code division multiple access system
  • A frequency offset estimation method and device applied to time division synchronous code division multiple access system

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Embodiment Construction

[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] refer to image 3 , the frequency offset estimating device in the embodiment of the present invention mainly includes: a frequency offset estimator 10 , a frequency offset compensator 20 , a frequency offset estimator 30 and an accumulator 40 .

[0028] The frequency offset estimator 10 uses the demodulated data D 0 Perform frequency offset estimation to obtain frequency offset estimation value f 1 , the demodulation may be joint detection demodulation.

[0029] In order to effectively expand the range of frequency offset estimation, frequency offset estimator 10 uses fewer data symbols to perform frequency offset estimation. Assuming that the number of data symbols used is N1, if the spreading factor SF=16 used by the system, the preferre...

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Abstract

The invention provides a frequency offset estimation method and device for TD-SCDMA system. The device comprises a first frequency offset estimator, for frequency offset estimation of parts of demodulated data and obtaining the first frequency offset estimation value, the mentioned part data symbol number being n; frequency offset compensator, for frequency offset compensation for demodulated data employing the first frequency offset estimation value and obtaining data compensated by frequency offset; the second frequency offset estimator, for frequency offset estimation employing data symbol more than n in data after frequency offset compensation and obtaining the second frequency offset estimation value; accumulator, accumulating the first frequency offset estimation value and the second frequency offset value as final frequency offset estimation value for output. The invention can accomplish high precision and large range frequency offset estimation.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a method and a device for estimating a frequency offset applied to a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system. Background technique [0002] At present, most communication systems use the method of coherent detection for data demodulation, such as the TD-SCDMA system, that is, the frequency used by the receiver to receive the wireless signal should be exactly the same as the carrier frequency of the wireless signal or between the two. The margin of error is small. Therefore, in order to ensure that the receiver can accurately track the carrier frequency, the frequency offset estimation algorithm of the receiver is more important. Only by accurately estimating the frequency offset between the two can it be corrected in time to achieve the purpose of accurate tracking. [0003] figure 1 It is a schematic diagram of the d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L25/03
Inventor 许百成
Owner ST ERICSSON SEMICON BEIJING
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