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Orthogonal frequency division multiplexing (OFDM) system common phase error compensation method and device

A technology of orthogonal frequency division and compensation method, applied in the field of communication, can solve problems such as errors and influence system performance, and achieve the effect of improving performance and reducing influence

Active Publication Date: 2013-01-02
HAIER BEIJING IC DESIGN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when performing phase compensation in this way, due to It is not consistent with the actual channel, so errors will be introduced, and if there is residual carrier deviation or sampling deviation, the deviation of the estimated value will be greater, affecting system performance

Method used

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  • Orthogonal frequency division multiplexing (OFDM) system common phase error compensation method and device
  • Orthogonal frequency division multiplexing (OFDM) system common phase error compensation method and device
  • Orthogonal frequency division multiplexing (OFDM) system common phase error compensation method and device

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Embodiment 1

[0053] image 3 It is a flow chart of the public phase difference compensation method of the OFDM system provided by this embodiment, such as image 3 As shown, the common phase difference compensation method of the OFDM system in this embodiment includes the following steps:

[0054] Step S101, extracting the set Γ of carrier position numbers of continuous pilots in the fast Fourier transform FFT output data.

[0055] get as figure 1 The data output by FFT in the shown OFDM system, and the carrier position sequence number sets of continuous pilots are extracted, specifically including:

[0056] Step S101_1, obtaining the position sequence number set B0 of the non-zero data part of the continuous pilot in the OFDM symbol

[0057] Figure 4 is a schematic diagram of OFDM spectrum data distribution in DVB-T2K mode, such as Figure 4 As shown, the shaded part in the figure is the non-zero data part, and the non-shaded part is the zero data part filled with zeros. The non-ze...

Embodiment 2

[0101] Figure 5 It is a schematic diagram of the public phase difference compensation device of the OFDM system provided in this embodiment, as shown in Figure 5 As shown, the OFDM system public phase difference compensator of the present embodiment includes: sequence number extraction unit 10, pilot frequency difference unit 20, increment calculation unit 30, public phase difference calculation unit 40, compensation unit 50 and real part processing Unit 60.

[0102] The serial number extracting unit 10 is used to extract the carrier position serial number set Γ of continuous pilots in the fast Fourier transform FFT output data.

[0103] Serial number extracting unit 10 obtains such as figure 1 In the shown OFDM system, the data output by FFT is extracted, and the carrier position sequence number sets of continuous pilots are extracted.

[0104] The serial number extracting unit 10 specifically includes: a position extracting subunit 101 and a position calculating subunit...

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Abstract

The invention relates to an orthogonal frequency division multiplexing (OFDM) system common phase error compensation method and a device. The method comprises steps of extracting a carrier position serial number set gamma of continuous pilot frequency of fast Fourier transform (FFT) output data; conducting conjugating multiplication for a carrier of a position serial number of a current OFDM symbol and a carrier of the same position serial number of a last OFDM symbol in accordance with position serial numbers of the carrier position serial number set gamma and obtaining a pilot frequency differential value; calculating and obtaining a common phase error increment by the aid of the pilot frequency differential value; enabling the sum of all common phase error increments prior to the current OFDM symbol to serve as the common phase error between the current OFDM symbol and a standard OFDM symbol; and conducting common phase error compensation for the current OFDM symbol by the aid of the common phase error. Accordingly, the common phase error of all OFDM symbols is compensated to a standard value, the effect of the common phase error on a system is reduced, and the OFDM system receiving performance is improved.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and device for compensating a common phase difference of an orthogonal frequency division multiplexing system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier parallel transmission technology, which has the ability to resist multi-path fading, narrow-band interference and high frequency utilization, and is widely used in the field of wireless digital communication. The basic idea of ​​OFDM is: divide a given channel into many orthogonal sub-channels in the frequency domain, use a sub-carrier for modulation on each sub-channel, convert high-speed data signals into parallel low-speed sub-data streams, and modulate to each All subcarriers are orthogonal to each other, and each subcarrier is transmitted in parallel. [0003] Orthogonal signals can be separated by adopting a correlation technique at the receiving end,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 洪波
Owner HAIER BEIJING IC DESIGN
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