Multi-user cognitive MIMO (Multiple-Input Multiple-Output) system concurrent transmission and user scheduling method based on IAC (interactive application communication)

Abstract

The invention discloses a multi-user cognitive MIMO (Multiple-Input Multiple-Output) system concurrent transmission and user scheduling method based on IAC (interactive application communication). The method comprises the following steps that: (1) an authorized user and an authorized base station obtain channel information H0, cognitive users obtain channel information H0, Hi and H<s>i, and a cognitive base station obtains all channel information; (2) the authorized user, the authorized base station, the cognitive users and the cognitive base station respectively implement singular value decomposition on the H0; (3) all the cognitive users respectively calculate an intermediate matrix norm value, and the cognitive user with the maximum value is selected to be scheduled; (4) the cognitive base station gives notice to the scheduled cognitive user SUxi, and the authorized user and the cognitive user SUxi respectively construct a precoding matrix P0 and a precoding vector pxi; (5) data of the authorized user and the activated cognitive user are respectively pre-treated by P0 and pxi and then are sent to a base station; (6) the authorized base station solves a primary data stream x01 of the authorized user and sends the primary data stream x01 to the cognitive base station; (7) filter waves are received by utilizing F<H>, x01 is removed from a received mixed signal, a secondary data stream x02 of the authorized user and a data stream x(xi) of the cognitive user are respectively solved, and x02 is sent to the authorized base station.

Description

technical field [0001] The invention relates to the communication field, in particular to an IAC-based multi-user cognitive MIMO system concurrent transmission and user scheduling method. Background technique [0002] With the rapid development of wireless communication technology, wireless spectrum resources, as a non-renewable resource, are increasingly scarce. The fixed frequency spectrum allocation leads to very scarce spectrum resources that can be allocated to new applications, which greatly limits the development of wireless communication. Therefore, people begin to shift the focus of attention from seeking new idle spectrum resources to improving the utilization of spectrum resources. Cognitive radio (CR), as a technology to improve spectrum utilization, has become a research hotspot. When the cognitive user's transmission does not affect the licensed user's transmission or the interference to the licensed user's transmission is below a certain threshold, this tech...

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Problems solved by technology

However, this work does not address how to obtain the cooperative processing gain and the use of multi-antenna techniques

QUXin, KANGCG. Onfeasibility of interference alignment and cancellation for Gaussian interference multiple access channel [C] / / 2012IEEE International Conference on Communications. Ottawa, Canada: IEEEpress, 2012: 2467-2471 (Feasibility of interference alignment and cancellation in Gaussian interference multiple access channel) (Multiple access channel, MAC) studies the feasibility of the IAC algorithm, and gives the upper bound of each user's degree of freedom, but does not involve the specific application design of the IAC algorithm

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