Implementation method of pilot-assisted detector for DVB-T signals in cognitive radio network

A cognitive radio and auxiliary detector technology, applied in the field of local spectrum sensing, can solve the problems of not considering the pilot component, the probability of time synchronization information is small, and the complexity is low

Inactive Publication Date: 2010-06-16
XI AN JIAOTONG UNIV
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Problems solved by technology

[0013] in Although the complexity of this method is lower than Huawei's perception method, precise synchronization information is required to obtain performance gains
However, the probability of obtaining accurate time synchronization information in practice is very small
On the other hand, this scheme does not consider the pilot component in the actual CP-OFDM signal, such as DVB-T signal, WLAN (Wireless Local Area Networks) signal, WMAN (Wireless Metropolitan Area Networks) signal, LTE (LongTerm Evolution) signal, etc.

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  • Implementation method of pilot-assisted detector for DVB-T signals in cognitive radio network
  • Implementation method of pilot-assisted detector for DVB-T signals in cognitive radio network
  • Implementation method of pilot-assisted detector for DVB-T signals in cognitive radio network

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Embodiment Construction

[0067] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0068] The steps of the present invention are as follows:

[0069] First, for a given false report probability P f , detection probability P d And the signal-to-noise ratio level, determine the order of the pilot-aided detector or the observation time length M required for spectrum sensing, where M also represents the number of OFDM (orthogonal frequency division multiplexing) symbols in the observation data;

[0070] Second, the observed data samples r(n), n=m+1, m+2, . . . , m+ML are input to the processing unit of the pilot-aided detector. In the processing unit, the observation data passes through M-1 delay units in turn, and the delay length of each delay unit is L, where L corresponds to the number of samples collected in one OFDM symbol time length, and at the same time, it experiences different time delays The sample data of is multiplied and added...

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Abstract

The invention relates to an implementation method of a pilot-assisted detector for DVB-T signals in a cognitive radio network. Most countries in the world use DVB-T as the signal standard for ground digital televisions, the nodes in a cognitive radio network acquire spectra-available information on the wave band of the digital television signals mainly by means of spectra perception, and therefore, the research into spectra perception methods for DVB-T signals has significant value. The invention provides a pilot-assisted detector for DVB-T signals. Firstly, a processing unit in the detector strengthens the periodic pilot components in a DVB-T signal received by a secondary user through the sum of product movements but inhibits other components; and secondly, a combination and judgment unit in the detector combines the outputs of the processing unit and judges whether a master user signal exists. The theoretical analysis and the simulation result indicate that the detector is free from the effects of multidiameter Rayleigh fading, can differentiate the master user signal from interference under the conditions of no synchronizing information and low signal-to-noise ratio, and enhances the detection performance.

Description

technical field [0001] The invention belongs to a local spectrum sensing method in the technical field of cognitive radio communication, and in particular relates to an implementation method of a pilot auxiliary detector for DvB-T signals in a cognitive radio network. Background technique [0002] With the increase of wireless communication systems and the increase of wireless communication traffic, available limited spectrum resources are increasingly scarce. However, spectrum surveys show that even in hotspots, most of the spectrum is vacant most of the time. Therefore, the main reason for the scarcity of spectrum resources lies in the inflexible traditional spectrum management strategies. Cognitive radio technology can opportunistically use the spectrum not used by the primary user and effectively alleviate the scarcity of spectrum resources, so it has been extensively studied. [0003] A basic requirement of cognitive radio technology is that the operation of secondary...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04B17/309H04B17/345
Inventor 任品毅尹稳山吴广恩王熠晨晏双成龚敏康汪瑞魏莉吕福顺
Owner XI AN JIAOTONG UNIV
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