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Multi-antenna spectrum sensing method and device suitable for broadband system

A broadband system and spectrum sensing technology, applied in the field of multi-antenna spectrum sensing methods and devices

Inactive Publication Date: 2013-05-22
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] Based on the above problems, the present invention proposes a multi-antenna spectrum sensing method and device suitable for broadband systems, which can effectively solve the impact of noise uncertainty on detection performance

Method used

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  • Multi-antenna spectrum sensing method and device suitable for broadband system
  • Multi-antenna spectrum sensing method and device suitable for broadband system
  • Multi-antenna spectrum sensing method and device suitable for broadband system

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Embodiment Construction

[0035] The present invention will be described in detail below through the accompanying drawings and examples.

[0036] figure 1 It is a schematic diagram of spectrum utilization distribution according to an embodiment of the present invention. The broadband system covers from f s Hz to f e The frequency range of Hz can be divided into Q sub-channels, wherein the bandwidth of each sub-channel is WHz. like figure 1 As shown, assuming that K sub-channels are occupied by authorized users, the remaining Q-K sub-channels are idle and can be used for spectrum access by secondary users.

[0037] figure 2 The specific algorithm flow of an embodiment of the present invention mainly includes the following steps.

[0038]In step 201, a received signal is acquired from a multi-antenna receiving end of a user. Note that the signal received from the user is the superposition of the authorized user signal after channel fading and the multi-antenna array noise.

[0039] In step 202, ...

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Abstract

The invention discloses a multi-antenna spectrum sensing method and a device suitable for a broadband system. All component channels of the broadband system are detected simultaneously. First, unitary transformation treatment is conducted to the sampling covariance matrix of receiving signals, based on the galeazzi likelihood function and the Gerschgorin radii of noise, the number of occupied component channels is estimated, and then according the size of power of the component channels, the positions of the occupied component channels are judged, and free component channels and the occupied component channels are determined. Compared with a traditional broadband spectrum sensing method, the multi-antenna spectrum sensing method suitable for the broadband system is characterized in that a traditional subjective judgment threshold does not rely on, however, the orthogonality of channel subspace and noise subspace is used to judge; apriori information of noise power is of no need, and robustness is achieved to the uncertainty of the noise. By means of the multi-antenna spectrum sensing method suitable for the broadband system, the influence of the uncertainty of the noise on system performance can be effectively restrained, sensing time is shortened, and spectrum efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a multi-antenna spectrum sensing method and device suitable for broadband systems. Background technique [0002] Traditional wireless communication systems use a fixed frequency spectrum allocation mechanism. The Federal Communications Commission (FCC) is responsible for authorizing and managing radio frequency transmission devices and equipment other than those used by the federal government, and assigning wireless spectrum resources to authorized users. However, this fixed spectrum allocation mechanism may cause certain spectrum resources to be underutilized, while licensed users on other spectrum resources are overcrowded. In order to improve spectrum utilization, a new dynamic spectrum allocation mechanism is proposed. Within the frequency range of interest, unlicensed users (also called slave users) continuously perform spectrum sensing to detect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/08H04B7/08
Inventor 刘元安卿浩博谢刚刘昌兴刘凯明刘芳
Owner BEIJING UNIV OF POSTS & TELECOMM
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