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

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 a method for realizing 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 user...

AI Technical Summary

Problems solved by technology

[0013] in σ 2 = 1 2 ( ML + N ) Σ n = 0 ML + N - 1 | r ( n ) | 2 . 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 (Long Term Evolution) Signal etc.

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