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Carrier frequency offset correcting method

A technology of carrier frequency offset and correction method, which is applied in the direction of multi-frequency code system, etc., can solve the problems that cannot be restored, and the estimation ability of digital circuit carrier frequency offset declines, so as to achieve the effect of strengthening correction ability and reducing complexity

Active Publication Date: 2015-06-10
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although it is relatively simple to use a baseband digital circuit to correct the carrier frequency offset, it may cause the following problems. One is that the DC term filter (DC Notch Filter) after the mixer may cause carrier frequency offset Therefore, the signal close to DC is filtered out, resulting in irreversible
The second is that when the carrier frequency offset is serious, the carrier frequency offset estimation capability of the digital circuit may be greatly reduced due to preamble symbol (preamble symbol) detection or decoding errors.

Method used

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Embodiment Construction

[0028] Certain terms are used throughout the specification and following claims to refer to particular components. Those of ordinary skill in the art should understand that manufacturers may use different terms to refer to the same component. This description and the following claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. "Includes" mentioned throughout the specification and subsequent claims is an open-ended term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" herein includes any direct and indirect means of electrical connection. Therefore, if it is described that a first device is coupled to a second device, it means that the first device may be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means.

[0029] The p...

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Abstract

The invention provides a carrier frequency offset correcting method. The method is used for correcting carrier frequency offset of a receiver. The method comprises the steps of receiving at least one carrier frequency offset estimation value generated by digital carrier frequency offset estimation; generating one carrier frequency offset adjustment value according to the at least one carrier frequency offset estimation value; and adjusting an oscillator frequency of an oscillator of the receiver according to the carrier frequency offset adjustment value.

Description

technical field [0001] The embodiments disclosed in the present invention relate to calibrating carrier frequency offset, especially a method for calibrating carrier frequency offset applied in an Orthogonal Frequency Division Multiplexing (OFDM) receiver. Background technique [0002] In an OFDM communication system, for example figure 1 In the OFDM communication system 100 shown, in general, since there is a frequency difference between the respective oscillators (not shown in the figure) of a transmitting end 102 and a receiving end 104, the receiving end 104 A mixer (mixer) 106 will have the problem of carrier frequency offset (Carrier Frequency Offset, CFO); in addition, as far as an analog to digital converter (Analog to Digital Converter, ADC) 108 of the receiving end 104 is concerned, then There will be a sampling frequency offset (Sample Cock Offset, SCO) problem. [0003] Carrier frequency offset and sampling frequency offset are the main reasons for destroying s...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 吴智湧颜恺纬张仲尧
Owner REALTEK SEMICON CORP