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Method for sending secondary pre-code based on zero subspace technology in cognitive radio MIMO system

A technology of cognitive wireless and space technology, applied in the field of cognitive wireless communication system, can solve the problems of difficult communication system implementation of P-SVD scheme, and achieve the effect of easy implementation and interference elimination.

Active Publication Date: 2010-03-03
上海众网数聚信息科技股份有限公司
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Problems solved by technology

However, in the actual CR-MIMO system, it is difficult for the secondary transmitter to obtain this information, so the P-SVD scheme is difficult to implement in the actual communication system

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Embodiment Construction

[0052] In order to solve the problem that the P-SVD scheme is difficult to implement in an actual communication system, this patent proposes a cognitive MIMO secondary precoding transmission scheme based on subspace technology. First, the secondary transmitter uses its sensing capability to periodically perceive the primary user's transmitted signal and estimate the corresponding covariance matrix. Then, the subspace technique is applied to this co-covariance matrix to estimate the corresponding noise subspace, thus obtaining the channel matrix G H (the channel matrix from the secondary transmitter to all active users), and use the MDL (Minimum Descriptor Length) criterion to estimate the dimension of the null space. Finally, the resulting null space is used as the precoding matrix for the secondary transmission, which completely eliminates the interference of the secondary transmission to the primary user. Furthermore, the capacity of the secondary MIMO channel with the prop...

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Abstract

The invention relates to a method for sending secondary pre-code based on zero subspace technology in a cognitive radio MIMO (CR MIMO) system of time division duplex (TDD) used in primary user transmission. The method comprises the following steps: firstly, periodically perceiving transmitting signals of primary users and estimating a corresponding covariance matrix through a secondary transmitter; secondly, using the covariance matrix to estimate zero subspaces of channel matrixes from secondary users to all active primary users, and using an information criteria (such as MDL) to estimate the dimension number of the zero subspaces and determining the service conditions of space sub channels; and finally, using the acquired zero subspaces as pre-code matrixes of secondary transmission, wherein the transmission method fully eliminates the interference of the secondary transmission with the primary users. The provided scheme does not need instant channel information of the primary users, and nor the number of the known primary users. Therefore, the provided scheme is easy to be implemented in the practical CR MIMO system.

Description

technical field [0001] The invention relates to the field of information technology, in particular to a transmission method of a secondary system in a cognitive MIMO network, which is applicable to a cognitive wireless communication system using MIMO technology with a central structure, mesh and ad hoc network structures. Background technique [0002] "Cognitive Radio" (Cognitive Radio, CR) is proposed on the basis of the concept of software radio. The Spectrum Policy Task Force (SPTF) report released by the US Federal Communications Commission (FCC) in 2002 has a profound impact on the use of spectrum resources. The report set up a cognitive radio working group, which was established in Washington in May 2003, and then held an academic conference on cognitive radio in Las Vegas, USA in March 2004, marking the formalization of cognitive radio technology. start. Cognitive radio refers to the ability to automatically utilize partially unused frequency bands to provide new pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04B7/04H04B17/00
Inventor 易辉跃胡宏林郭坤祺金圣峣周玉芬孙彦赞
Owner 上海众网数聚信息科技股份有限公司
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