Cognitive system frequency spectrum sharing method on basis of space signal processing

A signal processing and cognitive system technology, applied in the field of wireless communication, can solve the problems of not considering the simultaneous calculation of the spatial correlation of the cognitive user terminal, not considering the selection of the cognitive feature mode at the same time, etc.

Inactive Publication Date: 2012-07-04
XIDIAN UNIV
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Problems solved by technology

However, this type of method has the following shortcomings in the design: in order to select a suitable coexistence channel, only the cognitive base station (CBS) performs the spatial correlation calculation, and does not consider the spatial correlation calculation of the c

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  • Cognitive system frequency spectrum sharing method on basis of space signal processing
  • Cognitive system frequency spectrum sharing method on basis of space signal processing
  • Cognitive system frequency spectrum sharing method on basis of space signal processing

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Embodiment Construction

[0051] The present invention will be described in detail below in conjunction with specific embodiments.

[0052] refer to figure 1 , the present invention studies the downlink communication of a single cell covered by the authorized system and the cognitive system, both the cognitive and authorized communication adopt BF mode, and both the cognitive and authorized systems adopt MIMO. Among them, the authorization system includes a base station and multiple users, and the cognitive system consists of a base station and a user. For the sake of simplicity, multiple antennas are not drawn at the receiving and receiving ends of the cognitive and authorization systems, and only two PUs are shown. Let the number of authorized base station (primary base station, PBS) antennas be M t , the number of authorized user antennas is M r , the number of cognitive base station (CBS) antennas is L t , the number of antennas of cognitive users is L r . Let i represent the i-th authorized ...

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Abstract

The invention discloses a cognitive system frequency spectrum sharing method on the basis of space signal processing, which can be used for a cognitive radio system. The cognitive system frequency spectrum sharing method specifically comprises the following process that: firstly, transceiving ends of the cognitive system respectively acquire required channel information and construct different matrixes to carry out spacial related degree calculation of the transceiving ends after preprocessing the channel information; then according to the spacial related degrees calculated at the transceiving ends, a CBS (cognitive base station) combines the transmission gain to calculate an airspace resource quality factor; and finally, the CBS completes combined selection of an authorize channel and a characteristic mode according to an airspace resource quality factor calculating result, and after the result is notified to a cognitive user, the transceiving ends carry out combined signal processing, so that the simultaneous and same-frequency coexistence of the cognitive system and an authorization system is realized. The method disclosed by the invention has the advantages that all the transceiving ends participate in making a decision and the combined selection of the authorize channel and the characteristic mode is considered. The method has a more reasonable design. The cognitive communication performance is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and specifically relates to a spectrum sharing method based on spatial signal processing, which realizes coexistence transmission of cognitive communication and authorized communication, can be used in a cognitive radio system, and can effectively improve cognitive communication performance. Background technique [0002] Today's fixed spectrum allocation policy leads to an extreme shortage of spectrum resources that can be authorized for new applications, which limits the development and application of wireless communication technologies. However, studies have shown that, in fact, most of the authorized spectrum resources are unused at different times and places, that is, the spectrum utilization rate is very low. To this end, people have proposed a cognitive radio technology that can effectively improve spectrum utilization. It can perceive the electromagnetic environment where i...

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Application Information

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IPC IPC(8): H04W16/14
Inventor 李钊李攀杨家玮赵林靖马英红刘明骞马丹
Owner XIDIAN UNIV
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