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Out-of-band power inhibiting method and device

An out-of-band power and noise signal technology, applied in modulation carrier systems, digital transmission systems, electrical components, etc., can solve the problem of reducing the effective CP length, increase the ability to resist inter-symbol interference, increase the length, and speed up the out-of-band The effect of power attenuation

Active Publication Date: 2013-03-20
HUAWEI TECH CO LTD
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Problems solved by technology

[0005] Embodiments of the present invention provide a method and device for out-of-band power suppression, which overcomes the defect that the effective CP length is reduced while out-of-band power is suppressed in the prior art

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Embodiment Construction

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0017] see figure 1 , an embodiment of the present invention provides an out-of-band power suppression method, including:

[0018] 101. Receive an OFDM signal;

[0019] 102. Acquire and superimpose the noise signal, so that the time domain value of the first N samples of the cyclic prefix of the current OFDM signal after adding noise is equal to the time domain value of the first N samples of the previous OFDM signal without the cyclic prefix after adding noise, a...

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Abstract

The embodiments of the present invention provide a method for suppressing out-of-band power in an Orthogonal Frequency Division Multiplexing (OFDM) system, which includes: receiving an OFDM signal; acquiring and adding a noise signal, making the first N-sample time-domain value of the cyclic prefix of the current OFDM signal added with the noise equal to the first N-sample time-domain value of the previous OFDM signal without the cyclic prefix after being added with the noise, and making the norm of said noise signal be the minimum, wherein N is the positive integer less than the length of said cyclic prefix. The embodiments of invention also provide a device for suppressing out-of-band power that is used in a transmitter, which effectively accelerates the out-of-band power suppression, and increases the efficient Cyclic Prefix (CP) length at the same time, thereby increasing the ability of resisting inter-symbol interference.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method and device for suppressing out-of-band power of an OFDM system. Background technique [0002] With the growth of users' demand for various real-time multimedia services and the rapid development of Internet technology, there will be higher and higher requirements for the information transmission rate of wireless communication. In order to support higher information transmission rate and higher mobile speed of users, in the next generation wireless communication system, it is necessary to adopt wireless transmission technology with higher spectrum efficiency and stronger ability to resist multipath interference. [0003] Among various current wireless schemes for high-rate transmission, multi-carrier modulation technology represented by OFDM (Orthogonal Frequency Division Multiplexing) is one of the most promising schemes. The multi-carrier modulation technology dec...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2626H04L27/2647H04L27/26265
Inventor 姜勇王艺
Owner HUAWEI TECH CO LTD