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Implementation method of multi-antenna spectrum sensing scheme based on space-time diversity

A spectrum sensing, space-time diversity technology, applied in diversity/multi-antenna systems, space transmit diversity, transmission monitoring, etc.

Inactive Publication Date: 2011-07-06
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the work of P.Wang and A.Taherpour, the multi-antenna spectrum sensing scheme only exploits the space diversity of multi-antenna

Method used

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  • Implementation method of multi-antenna spectrum sensing scheme based on space-time diversity
  • Implementation method of multi-antenna spectrum sensing scheme based on space-time diversity
  • Implementation method of multi-antenna spectrum sensing scheme based on space-time diversity

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Embodiment Construction

[0048] The present invention will be described in further detail below in conjunction with the accompanying drawings and accompanying tables.

[0049] The process of the present invention is as follows:

[0050] 1) Each secondary user is equipped with M antennas, oversampled on each antenna, and each antenna uses the same reference clock and sampling rate f s / 2 pair target signal

[0051] a m ( t ) = n m ( t ) H 0 h m s ( t ) + ...

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Abstract

The invention relates to an implementation method of a multi-antenna spectrum sensing scheme based on space-time diversity. Each pair of antennas of a secondary user over samples signals of a target master user; signal samples acquired are stacked as signal sample matrixes that are extracted to obtain two groups of signal sample submatrixes; the two groups of signal sample submatrixes are used for estimating a signal sample covariance matrix based on space diversity, as well as a signal sample covariance matrix based on time diversity; then the two signal sample covariance matrixes are combined to be subjected to characteristic value decomposition so as to obtain a set of characteristic values; and according to the set of characteristic values, test statistic is built and the appearance of the master user signals is judged. As shown by theoretical analysis and simulation results, the implementation method does not need the prior information relevant to the master user signals, the channel information between the master user and the secondary user, or the information on noise power, and can improve the reliability of the information on frequency spectrum availability.

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 multi-antenna spectrum sensing scheme based on space-time diversity. Background technique [0002] With the rapid development of wireless communication technology, available wireless spectrum resources are increasingly scarce under the traditional fixed spectrum allocation strategy. However, actual spectrum measurements show that even in hot spots, most of the allocated wireless spectrum is idle most of the time. Therefore, one of the main reasons for the scarcity of wireless spectrum resources lies in the inflexible traditional spectrum allocation strategy. In order to alleviate the scarcity of wireless spectrum resources, it is necessary to effectively improve the utilization of wireless spectrum resources. Cognitive radio is a radio technology aimed at improving the utilization...

Claims

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Application Information

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IPC IPC(8): H04B17/00H04B7/08H04B17/382
Inventor 任品毅尹稳山马瑞娟吴广恩王熠晨晏双成龚敏康胡文权吕福顺
Owner XI AN JIAOTONG UNIV
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