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A method and apparatus for frequency deviation estimation and compensation

A frequency offset estimation and frequency offset technology, applied in the field of mobile communication, can solve the problems of large frequency offset estimation error, large noise influence, small range, etc.

Active Publication Date: 2010-04-28
ZTE CORP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] Since the TD-SCDMA system uses the TDD duplex mode, each time slot is very short, and it is greatly affected by noise when estimating the frequency offset. The range of frequency offset estimation is small, and the estimation error for large frequency offset is relatively large.

Method used

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  • A method and apparatus for frequency deviation estimation and compensation
  • A method and apparatus for frequency deviation estimation and compensation
  • A method and apparatus for frequency deviation estimation and compensation

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Embodiment Construction

[0054] Below is that the inventive method is described in detail:

[0055] First, use the initial value of the frequency offset for data compensation, and directly use the initial value of the frequency offset f 0 Compensate the slot data.

[0056] d ( n ) ← d ( n ) · e j f 0 · n - - - ( 1 )

[0057] Then, the phase including the frequency offset information is obtained.

[0058] The symbol of the joint detection output can be expressed as:

[0059] d ^ ( n ) = d ( n ) · e jΔf ·...

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Abstract

The invention is a frequency offset estimating and compensating method and device used in CDMA mobile communication system, and the method includes the steps: a) using a frequency offset value f0 obtained in the previous time gap as an initial value to compensate the output sign in the current time gap: d(n)<--d(n).ejf0.n; b) tuning by maximum likelihood; (3) outputting the current frequency offset value for use in the next time gap. It enlarges the correction range of frequency offset and improves estimation accuracy, and effectively reduces code error ratio, largely improves system property,where the maximum estimated error of frequency offset is not over 3%, especially has a smaller estimated error range of large frequency and a very good correction effect, thus effectively improving system property and reducing code error ratio.

Description

technical field [0001] The invention relates to an effective frequency offset estimation and compensation method and device, in particular to a frequency offset estimation and compensation method for a TD-SCDMA system in the mobile communication field. [0002] The present invention can also be used in other CDMA systems in the field of mobile communication. Background technique [0003] The TD-SCDMA system has the advantages of large capacity, strong anti-multipath fading ability and high frequency band utilization, and has become the mainstream of the third-generation mobile communication wireless transmission technology. Which involves many key technologies, such as multi-user detection technology, RAKE receiving technology smart antenna technology. When studying these technologies, it is assumed that there is no carrier frequency deviation at both ends of the system. However, in practical applications, the frequency deviation of the carrier frequency caused by the diff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/00H04B7/08H04J13/00
Inventor 曾召华李萍
Owner ZTE CORP
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