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Channel estimation optimizing method for amplitude-limiting OFDM system

A technology of channel estimation and optimization method, which is applied in the field of communication, and can solve problems such as data signal distortion, clipping noise, and inability to perform channel estimation at the receiving end

Inactive Publication Date: 2007-12-05
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0006] The main disadvantage of the channel estimation of the existing clipped OFDM system is that clipping introduces clipping noise while causing data signal distortion, which leads to the distortion of the pilot signal, which will lead to the inability to perform correct channel estimation at the receiving end. Channel estimation and other related processing, causing performance degradation

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  • Channel estimation optimizing method for amplitude-limiting OFDM system
  • Channel estimation optimizing method for amplitude-limiting OFDM system

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Embodiment Construction

[0056] The implementation method of this patent under a specific OFDM configuration is given below. It should be noted that the parameters in the following examples do not affect the generality of this patent.

[0057] This implementation method uses the simulation tool Matlab. When the number of subcarriers in OFDM is 1024, the COST207 vehicle channel, the clipping threshold is 1.5, and the symbol error rate is 0.0355, a signal-to-noise ratio gain of about 2.5dB can be obtained.

[0058] The main innovation of the transmitting part of the present invention is to process the data signal and the pilot signal separately, and iteratively optimize the data signal before the clipping, thereby eliminating the influence of the clipping method on the pilot signal; the innovative module part of the present invention It can be realized by programming, and the corresponding hardware can be made by using the existing technology, and then combined with other modules to form the system of t...

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Abstract

The disclosed optimization method separates data signal from pilot signal, which pass through sign extension portion and IFFT portion respectively. The data portion passes through clipping module then. Optimizing process module carries out optimizing process for data signal. The purpose of the optimizing process is to eliminate influence on the pilot signal by the clipping operation. FFT is carried out for data after self-adapting amplitude limiting in advance so as to convert signal in time domain into signal in frequency domain. Afterwards, the signal in frequency domain passes through module for limiting and eliminating amplitude of noise. Finally, the method superposes the portion of optimizing processed data signal with the portion of pilot signal, and outputs the superposed signal. Through iterative algorithm, the invention reduces influence on the pilot signal caused by amplitude-limited noise, raises precision for estimating channel so as to raise transmission performance.

Description

technical field [0001] The invention belongs to the technical field of communication, and particularly relates to an orthogonal frequency division multiplexing system using limiters in combination. Background technique [0002] As we all know, in the existing communication technology, Orthogonal Frequency Division Multiplexing (OFDM) technology has become the main candidate technology for future mobile multimedia communication because of its high spectrum utilization rate, good anti-multipath fading and anti-interference performance. one. [0003] OFDM systems commonly use pilot signals for channel estimation. In the OFDM system, the pilot signal can be inserted in the frequency domain and time domain of the data, and the pilot signal is used at the receiving end to perform corresponding channel estimation. For details, see: Ye(Geoffrey)Li, "Pilot-Symbol-Aided Channel Estimation for OFDM in Wireless Systems" IEEETRANSACTIONS ON VEHICULAR TECHNOLOGY, VOL.49, NO.4, JULY 2000...

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Application Information

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IPC IPC(8): H04L27/26H04L25/02
Inventor 肖悦梁后兴雷霞唐友喜李少谦
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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