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A Two-Dimensional Adaptive Ofdm Channel Estimation Method Based on Uniformly Distributed Pilots

A channel estimation and uniform distribution technology, applied in the direction of multi-frequency code system, baseband system components, etc., can solve problems such as low complexity

Inactive Publication Date: 2016-06-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a low-complexity two-dimensional adaptive OFDM channel estimation method based on uniformly distributed pilots, for OFDM systems using two-dimensional uniformly distributed interpolation pilots, in channel statistics Channel estimation is performed when the characteristics are unknown, and it can adaptively track time-varying channels

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  • A Two-Dimensional Adaptive Ofdm Channel Estimation Method Based on Uniformly Distributed Pilots
  • A Two-Dimensional Adaptive Ofdm Channel Estimation Method Based on Uniformly Distributed Pilots
  • A Two-Dimensional Adaptive Ofdm Channel Estimation Method Based on Uniformly Distributed Pilots

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Embodiment

[0053] 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: FFT (FastFourierTransform, Fast Fourier Transform) points is 8192, CP mode is 14. The mapping mode is 16QAM, and the simulation system adopts a convolution 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.

[0054]

[0055] Table 1

[0056] The parameters that need to be used in the two-dimensional adaptive OFDM channel estimation method based on uniformly distributed pilots in the present invention are set to: Q t = 2 or Q t = 4, Q f =2. Using two-dimensional scattered pilots as interpolation pilots and continuous pilots as training pilots, then for each OFDM symbol, N l =177.

[0057] Figure 4 It is the simulation of the convergence characteristics of the present invention under differ...

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Abstract

The invention discloses a two-dimensional self-adaptive OFDM channel estimation method based on uniformly distributed pilots. At the transmitting end, two-dimensionally uniformly distributed interpolation pilots are inserted into each OFDM symbol, and training pilots are generated. Training pilots The positions and values ​​of the interpolated pilots are known to the receiving end. For each OFDM symbol, the receiving end interpolates the training pilot according to the channel estimation value of the interpolation pilot, calculates its channel estimation value, and trains the tap coefficient vector by combining the channel estimation value of the training pilot obtained by direct estimation. After all the training pilots in each OFDM symbol are trained, the interpolation coefficients can be obtained through the tap coefficient vector, so as to realize the channel estimation of the data. The present invention is applicable to the OFDM communication system adopting two-dimensional evenly distributed interpolation pilots, can perform channel estimation under the condition of unknown channel statistical characteristics, and can self-adaptively track the channel.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and more specifically relates to a two-dimensional self-adaptive OFDM channel estimation method based on uniformly distributed 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 wirel...

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Application Information

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