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Method and system for evaluating residual frequency offset

A technology of residual frequency offset and frequency offset estimation, applied in the direction of multi-frequency code system, etc., can solve problems such as low accuracy, complicated frequency offset estimation process, and limited number of pilot data

Active Publication Date: 2013-04-17
NATIONZ TECH INC
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Problems solved by technology

However, in order to improve data transmission efficiency, the number of pilot data in OFDM symbols is very limited, coupled with the influence of channel fading, the accuracy of this residual frequency offset estimation method is not high, in order to solve this residual frequency offset estimation method is accurate Some people think of using multiple OFDM symbols for residual frequency offset estimation and tracking correction to reduce errors, but this method makes the frequency offset estimation process too complicated

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  • Method and system for evaluating residual frequency offset
  • Method and system for evaluating residual frequency offset
  • Method and system for evaluating residual frequency offset

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Embodiment Construction

[0035] The residual frequency offset estimation method provided by the present invention mainly includes: obtaining a data unit for residual frequency offset estimation, which includes two identical training symbols carrying pilot codes; Frequency code for residual frequency offset estimation.

[0036] The method will be described in further detail below with reference to the accompanying drawings.

[0037] figure 1 It is a flowchart of a residual frequency offset estimation method according to an embodiment of the present invention, please refer to figure 1 :

[0038] S11. Acquire a data unit used for residual frequency offset estimation, where the data unit includes two identical segments of training symbols carrying pilot codes.

[0039] Preferably, the data unit is a data unit after rough synchronization, fractional frequency offset estimation and compensation, integer frequency offset estimation and compensation, fine synchronization and / or sampling clock offset correc...

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Abstract

The invention discloses a method and a system for evaluating residual frequency offset. The method comprises the steps of: acquiring a data unit for evaluating the residual frequency offset, wherein the data unit comprises two identical training symbols carried with pilot frequency codes; and evaluating residual frequency offset according to the pilot frequency codes in the two training symbols. Through the technical scheme, the invention provides the method and the system for evaluating residual frequency offset, which are high in precision and low in complexity.

Description

technical field [0001] The invention relates to the field of digital communication, in particular to a residual frequency offset estimation method and system. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing), as a modulation and multiple access technology, uses multiple parallel sub-carriers for low-rate data transmission to achieve high-rate data communication. It is used in digital audio broadcasting, digital video broadcasting, wireless LAN, It is widely used in many fields such as mobile TV multimedia broadcasting. [0003] However, the OFDM system is very sensitive to frequency deviation, because the most essential feature of OFDM system is that multiple parallel subcarriers are orthogonal to each other in the frequency domain, but the existence of frequency deviation will cause interference between carriers and seriously deteriorate performance. The exact starting position of the data in the FFT window is also mixed with fractional frequ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 陈烽
Owner NATIONZ TECH INC
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