Cognitive radio spectrum detection interval adjusting method based on channel characteristics

A cognitive radio and spectrum detection technology, which is applied in the field of cognitive radio spectrum detection interval adjustment based on channel characteristics, can solve problems such as no detection of users, suboptimal detection performance, and failure to comply with the law of user signal appearance and exit, etc. To achieve the effect of improving flexibility

Inactive Publication Date: 2015-09-16
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

[0006] The above research only considers the addition of control factors on the basis of fixed detection intervals, and there are several problems in the following aspects: First, different users have different characteristics of channel occupancy. If the same method is used for different users to adjust the detection interval , the detection performance is not optimal
Second, the detection interval mainly adopts a linear change strategy, which does not conform to the law of the appearance and exit of user signals in the channel
Third, most of the current methods only detect the emergence of authorized users from the channel, and do not detect the exit of users from the channel

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Embodiment Construction

[0027] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0028] Firstly, the spectrum detection model is established, and the spectrum detection is a binary hypothesis testing model, as shown in formula [11] and formula [12], it has two hypothetical states, H 0 Corresponding to the channel being in an idle (Idle) state, that is, there is no user signal in the channel, only noise signals exist; H 1 The corresponding channel is in the occupied (Busy) state, that is, there are both noise signals and user signals in the channel:

[0029] Formula [11]:

[0030] Formula [12]:

[0031] In formula [11] and formula [12], x(k) represents the detected signal; n(k) is the mean value is 0, and the variance is Gaussian white noise signal, that obeys f 0 ~ N(0, ) distribution; ss(k) is the authorized user signal, which is u1 , wi...

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Abstract

Since the influence of different spectrum occupancy characteristics of an authorized user on detection performance is not considered in the existing cognitive radio spectrum detection interval adjusting method, the invention provides a cognitive radio spectrum detection interval adjusting method based on channel characteristics. The cognitive radio spectrum detection interval adjusting method comprises the steps of determining a change parameter lambda of detection intervals according to different spectrum occupancy characteristics of an authorized user and making the detection interval change according to a growth curve alpha= K * (1-exp (-lambda * t)), and increases the adaptability of algorithms while reducing detection cost. The cognitive radio spectrum detection interval adjusting method can detect the appearance of the authorized user, can detect whether the user exits a channel in good performance, and further increases the channel utilization rate.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method for adjusting the detection interval of cognitive radio frequency spectrum based on channel characteristics. Background technique [0002] With the rapid development of communication technologies, more and more wireless devices need to be connected to the Internet, which makes wireless spectrum resources very tight. Wireless spectrum resource is a non-renewable resource, and the lack of spectrum resource has hindered the development of wireless communication technology. Another important reason for the scarcity of spectrum resources is the static frequency band allocation strategy, which allocates most of the wireless frequency bands to specific authorized users (Authorized Users). However, licensed frequency bands are idle most of the time, which results in uneven spectrum allocation and lower overall spectrum utilization. [0003] Cognitive Radio (Cogniti...

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Application Information

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IPC IPC(8): H04B17/382H04W24/02
Inventor 张秋云赵万欣曾闵江虹刘燕
Owner SOUTHWEAT UNIV OF SCI & TECH
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