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A OFDM Adaptive Channel Estimation Method Based on Two-Dimensional Scattered Pilots

An adaptive channel, two-dimensional discrete technology, applied in multi-frequency code systems, baseband system components and other directions, can solve problems such as low complexity, and achieve the effect of adaptive tracking

Inactive Publication Date: 2016-03-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a low-complexity OFDM adaptive channel estimation method based on two-dimensional scattered pilots, which can adaptively track fast fading channels when the FDI interpolation coefficients are known

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  • A OFDM Adaptive Channel Estimation Method Based on Two-Dimensional Scattered Pilots
  • A OFDM Adaptive Channel Estimation Method Based on Two-Dimensional Scattered Pilots
  • A OFDM Adaptive Channel Estimation Method Based on Two-Dimensional Scattered Pilots

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Embodiment

[0059] A specific implementation case of the present invention in the DVB-H system is introduced below, and a simulation result diagram is given. System simulation parameters: the number of FFT (FastFourierTransform, Fast Fourier Transform) points is 8192, the CP mode is 14, the mapping mode is 16QAM (QuadratureAmplitudeModulation, quadrature amplitude modulation), and the simulation system uses convolutional coding with a code rate of 23. The simulation uses the COST207TU6 channel model, and Table 1 shows the power delay spectrum of the COST207TU6 channel model.

[0060]

[0061] Table 1

[0062] The pilot structure adopted by the DVB-H system is a two-dimensional scattered pilot. In order to perform a fair performance comparison with other one-dimensional interpolation algorithms, the maximum multipath delay is used on FDI Order N' f =25 digital interpolation filter interpolation, where T s is the OFDM symbol period.

[0063] In the OFDM adaptive channel estimation ...

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Abstract

The invention discloses an OFDM adaptive channel estimation method based on two-dimensional discrete pilots. At the transmitting end, two-dimensional discrete interpolation pilots are inserted into each OFDM symbol, and training pilots, training pilots and interpolation pilots are generated. The location and value of the frequency are known to the receiver. For each OFDM symbol, under the condition that the FDI interpolation coefficient is known, the receiving end first performs one-dimensional FDI on the channel estimation value of the interpolated pilot, and uses the FDI output result as a virtual pilot to interpolate the training pilot and calculate its channel The estimated value is combined with the channel estimated value of the training pilot obtained by direct estimation to train the tap coefficients. After all the training pilots in each OFDM symbol are trained, the interpolation coefficients can be obtained through the tap coefficients, so as to realize the channel estimation of the data. The invention is suitable for the OFDM communication system adopting two-dimensional scattered pilot frequency, can estimate the channel under the condition that the statistical characteristics of the channel time direction are unknown, and can self-adaptively track the fast fading channel.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and more specifically relates to an OFDM adaptive channel estimation method based on two-dimensional scattered pilots. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) is a special multi-carrier modulation technology, which has natural advantages in combating multipath fading and is very suitable for high-speed data transmission. Therefore, OFDM has been widely used in modern wireless broadband access systems, such as DAB (Digital Audio Broadcasting, Digital Audio Broadcasting), DVB (Digital Video Broadcasting, Digital Television Broadcasting), LTE (Long Term Evolution, Long Term Evolution), WiFi, WiMAX (Worldwide Interoperability for Microwave Access, ie Global Microwave Interconnection Access), etc. In a wireless OFDM system, the multipath effect and the Doppler effect will cause the wireless channel to h...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 刘光辉王福到赵友高嫄嫄
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA