Resource allocation method for cognitive system based on space multiplexing

A cognitive system and resource allocation technology, applied in the field of wireless communication, can solve problems such as cognitive network capacity loss and failure to obtain multi-user diversity of cognitive network, so as to simplify user selection methods, increase computational complexity, and reduce effect of complexity

Inactive Publication Date: 2010-12-22
XI AN JIAOTONG UNIV
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Problems solved by technology

It is difficult to consider these three issues at the same time in the current methods. Some methods comprehensively consider the two aspects of avoiding interference and reducing algorithm complexity, and give the idea that there is only one single-antenna authorized user, and the cognitive user channel is multiple The channel allocation and the closed-form solution of the correlation matrix of the transmitted signal when the input is single output (MISO); for the case where the cognitive user is multiple input and multiple output (MIMO

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  • Resource allocation method for cognitive system based on space multiplexing
  • Resource allocation method for cognitive system based on space multiplexing
  • Resource allocation method for cognitive system based on space multiplexing

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Embodiment Construction

[0049] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0050] First, attach image 3 The network structure diagram of the specific implementation is given in , where the main system is a centralized system, and the number of authorized users is K p , each user has N p Antennas, the number of cognitive user pairs is K c , and constitutes K c Cognitive communication pairs, each communication pair has two secondary users: CU k and CU ka , where CU k For the transmitting node, CU ka is the receiving node, and each user has N c root antenna, and the number of licensed base station (PBS) antennas is M. Here it is assumed that N c ≥N p +1. Assume that there is only one authorized user accessing a certain frequency band at a certain moment, that is, image 3 For the PU shown in , the case of multiple authorized users accessing can be extended accordingly. attached image 3 There are three t...

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Abstract

The invention discloses a resource allocation method for a cognitive system based on space multiplexing. In the method, the F norm of a channel matrix is used to select a cognitive user so as to obtain a multi-user diversity gain of a cognitive network, a double-selection mode is used to lower the complexity of the algorithm, transmitted signals of the cognitive users are projected to a null space of an interference channel so as to avoid the interference of the cognitive user on an authorized user, the channel matrix of the cognitive user is converted into a concurrent independent channel by using a singular-value decomposition method, and the system capacity is enlarged by using a water-filling power allocation method. In a word, by using the multi-user diversity gain of the cognitive network, the method simplifies the user selection method and improves the system performance under the condition of acceptable computation complexity.

Description

Technical field: [0001] The invention relates to the field of wireless communication, and relates to a method for allocating space resources in a cognitive system, in particular to a method for allocating resources in a cognitive system based on space multiplexing. Background technique: [0002] Cognitive radio technology can significantly improve the spectrum efficiency of wireless communication systems and solve the contradiction between the scarcity of spectrum resources and low spectrum utilization, which has become a research hotspot in recent years. The discontinuity of time and space used by the existing spectrum registration network for the allocated spectrum makes most of the licensed frequency bands not fully utilized in time and space. Therefore, the cognitive radio network realizes dynamic spectrum access through opportunity sharing, which can share the spectrum with the licensed system without changing the protocol of the original licensed system and without aff...

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Application Information

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IPC IPC(8): H04W16/14H04W72/08H04W72/12
Inventor 荣玫廖学文朱世华任品毅
Owner XI AN JIAOTONG UNIV
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