Method and device for reducing out-of-band interference of cognitive radio

A cognitive radio and out-of-band interference technology, applied in the direction of multi-frequency code system, etc., can solve the problems of sub-carrier orthogonality destruction, system performance reduction, and large sub-carrier bandwidth, so as to reduce cognitive radio out-of-band interference, The effect of improving system performance

Active Publication Date: 2014-02-12
CHINA MOBILE COMM GRP CO LTD
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Problems solved by technology

[0009] However, in the above-mentioned first method, although the out-of-band interference can be suppressed through the window filter, adding the window filter will also broaden the signal, so in order to meet the interference cancellation requirements of the licensed frequency band, the closed subcarrier bandwidth remains bigger
In addition, due to the broadening of the signal, in order to ensure the original transmission efficiency remains unchanged, the length of the guard interval must be reduced, which may lead to the d

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  • Method and device for reducing out-of-band interference of cognitive radio
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  • Method and device for reducing out-of-band interference of cognitive radio

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[0032] In order to make the technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0033] figure 1 This is a flowchart of a method for reducing out-of-band interference of cognitive radio in an embodiment of the present invention.

[0034] like figure 1 As shown, the method for reducing out-of-band interference of cognitive radio in the embodiment of the present invention includes the following steps:

[0035] Step 101 , perform N minimum shift keying (NMSK) code modulation on the OFDM baseband signal to obtain a modulated OFDM-NMSK single sideband (SSB) signal.

[0036] In this step, in order to effectively increase the out-of-band attenuation of each subcarrier signal, NMSK code modulation is performed on the OFDM baseband signal to obtain a modulated OFDM-NMSK (SSB) signal.

[0037] In the specific embodiment of the present...

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Abstract

The invention provides a method and device for reducing out-of-band interference of cognitive radio. The method comprises the steps that NMSK coded modulation is conducted on an OFDM baseband signal and a modulated OFDM-NMSK single side band signal is obtained; according to the modulated OFDM-NMSK single side band signal and the requirement for interference elimination of each cognitive frequency band, subcarrier bandwidths needing to be closed and corresponding to each windowing coefficient are determined in advance; an interference elimination closing data list at least comprising the interference elimination requirement of each cognitive band, each windowing coefficient and the corresponding subcarrier bandwidths needing to be closed is established ; when a user need to exit out of the occupied cognitive frequency band, the interference elimination closing data list is inquired according to the interference elimination requirement of the cognitive frequency band and the corresponding windowing coefficient is selected; according to the selected windowing coefficient, a corresponding number of subcarriers are closed. According to the method and device for reducing the out-of-band interference of the cognitive radio, the out-of-band interference of the cognitive radio is effectively reduced and meanwhile the system performance is improved.

Description

technical field [0001] The present application relates to the field of mobile communication technologies, and in particular, to a method and apparatus for reducing out-of-band interference of cognitive radios. Background technique [0002] In the traditional wireless communication technology field, the spectrum allocation system is fixed spectrum allocation. In order to avoid interference between different systems, the radio management department conducts unified management of radio spectrum resources, and allocates specific frequency bands to each system by issuing radio spectrum use licenses to different systems, thereby dividing the spectrum into authorized frequency bands and unlicensed frequency bands. There are two parts of the frequency band. The licensed frequency band is generally only used by the corresponding authorized user (LU, License User), and will not be used by other unlicensed users. [0003] However, with the rapid development of wireless communication s...

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Application Information

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IPC IPC(8): H04L27/26
Inventor 翁玮文
Owner CHINA MOBILE COMM GRP CO LTD
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