Method for self-elimination of inter-subcarrier interference of differential OFDM (orthogonal frequency division multiplexing) system

A technology of inter-subcarrier interference and self-cancellation, applied in the field of differential OFDM systems, can solve problems such as large amount of calculation, large delay, and complex implementation of iterative elimination methods, and achieve the effect of reduced complexity and low bit error rate

Active Publication Date: 2011-11-09
启东赫子新材料有限公司
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Problems solved by technology

[0004] Among them, although the frequency domain equalization method and the time domain windowing method have a certain improvement on the impact on ICI, the out-of-band leakage power increases, and the utilization rate of the system is greatly reduced; the frequency offset estimation and compensation method is in a fast fading environment, The estimated error

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  • Method for self-elimination of inter-subcarrier interference of differential OFDM (orthogonal frequency division multiplexing) system
  • Method for self-elimination of inter-subcarrier interference of differential OFDM (orthogonal frequency division multiplexing) system
  • Method for self-elimination of inter-subcarrier interference of differential OFDM (orthogonal frequency division multiplexing) system

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with drawings and embodiments.

[0024] A method for self-eliminating interference between subcarriers in a differential OFDM system, the steps are as follows:

[0025] 1) Modulate the information to be sent at the sending end, perform differential encoding and then perform serial-to-parallel conversion;

[0026] 2) Process the processed data in step 1) using the zero-insertion algorithm;

[0027] 3) Perform Fourier transform on the subcarrier carrying the information processed in step 2), perform parallel-to-serial conversion, and then insert the cyclic prefix;

[0028] 4) Send information to the receiving end through the wireless antenna;

[0029] 5) The receiving end performs symbol timing synchronization, carrier synchronization, serial-to-parallel conversion on the information, and then performs Fourier transformation on the subcarrier carrying the information;

[0030] 6) Process the processed...

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Abstract

The invention discloses a method for self-elimination of inter-subcarrier interference of a differential OFDM (orthogonal frequency division multiplexing) system. In comparison with a primal differential OFDM system, a zero insertion algorithm and a displacement offsetting algorithm are added, wherein the zero insertion algorithm enables adjacent carriers of a subcarrier carrying information to return to zero, so that, the interference of the adjacent carriers on the information carrying carrier is effectively reduced. In a process of transmitting the information to a receiving terminal through a wireless channel, orthogonality cannot be completely formed under influence of Doppler frequency shift caused by carrier synchronous error and movement, and the subcarriers generate mutual interference; and by the displacement offsetting algorithm, the subcarriers carrying the information are amplified, a signal-to-noise ratio of the subcarrier to the adjacent subcarriers is increased, and the adjacent subcarriers are further subtracted, so that the inter-subcarrier interference is effectively eliminated.

Description

technical field [0001] The invention relates to a differential OFDM system, in particular to a subcarrier interference elimination method. Background technique [0002] OFDM technology has been widely used in broadband wireless mobile communication systems because of its good ability to resist channel frequency selective fading. However, the OFDM system requires strict orthogonality between subcarriers, and puts forward very strict requirements on frequency offset. The generation of frequency offset includes carrier synchronization error and motion-induced Doppler frequency shift. Frequency synchronization error can be reduced by a well-designed carrier synchronization algorithm, and Doppler frequency shift causes time-selective fading of the channel, especially for high-speed In the case of motion, the ICI caused by fast channel fading will lead to a rapid decline in system performance. [0003] Current methods to reduce the impact of ICI include frequency domain equaliza...

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Application Information

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IPC IPC(8): H04L27/26H04L25/03
Inventor 吴玉成邓慧平谢璐潘怡瑾王宇
Owner 启东赫子新材料有限公司
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