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Method and system for designing time domain man-made noises in orthogonal frequency division multiplexing system

A technology of man-made noise and orthogonal frequency division, applied in the direction of multi-frequency code system, etc., to achieve the effect of reducing the receiving signal-to-noise ratio, good interference effect, and high degree of freedom in time

Inactive Publication Date: 2012-07-04
TSINGHUA UNIV
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Problems solved by technology

[0008] The technical problem to be solved in this application is to provide a design method and system for time-domain artificial noise in OFDM systems, which can effectively add artificial noise without multiple antennas and improve the security of OFDM systems

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  • Method and system for designing time domain man-made noises in orthogonal frequency division multiplexing system
  • Method and system for designing time domain man-made noises in orthogonal frequency division multiplexing system
  • Method and system for designing time domain man-made noises in orthogonal frequency division multiplexing system

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Embodiment Construction

[0050] In order to make the above objects, features and advantages of the present application more obvious and comprehensible, the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0051] One of the core concepts of this application is to insert Gaussian artificial noise in the time domain part of the OFDM transmitter. This artificial noise is perpendicular to a space containing the channel of the legal receiver. The artificial noise can be used without disturbing the legal receiver. Effectively reduce the receiving signal-to-noise ratio of other illegal receivers and improve the security of the system. The artificial noise of this application is added in the time domain of the OFDM system, which has a high degree of time freedom and can produce good interference effects.

[0052] refer to figure 1 , which shows a flow chart of an embodiment of a method for designing time-domain a...

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Abstract

The invention provides a method and a system for designing time domain man-made noises in an orthogonal frequency division multiplexing system. The method includes: obtaining subcarrier number N of the system and length NCP of a cyclic prefix, wherein the N and the NCP are natural numbers; generating transmitting information of a transmitting end according to the subcarrier number N and the length NCP of the cyclic prefix; determining noises added in the transmitting information; adding the transmitting information and the noises to generate mixed signals; and performing serial-parallel conversion on the mixed signals, and transmitting the converted signals out.

Description

technical field [0001] The present application relates to the technical field of wireless communication, in particular to a method and system for designing time-domain artificial noise in an OFDM system. Background technique [0002] The new generation of wireless communication system requires that the network can provide high-speed and reliable transmission conditions for mobile users, and at the same time require wireless transmission to be secure. The purpose of communication security is to ensure that the sender's information can safely reach the receiver without being eavesdropped by an illegal third party. [0003] Orthogonal Frequency Division Multiplexing (OFDM) is a high-speed transmission technology in a wireless environment. Most of the frequency response curves of wireless channels are non-flat, and the main idea of ​​OFDM technology is to divide a given channel into many orthogonal sub-channels in the frequency domain, use a sub-carrier for modulation on each s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 陈翔秦浩浩赵熠飞张焱赵明王京
Owner TSINGHUA UNIV
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