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Cognitive radio user space division multiplexing method based on interference alignment

A cognitive radio and cognitive user technology, applied in the field of wireless communication, can solve problems such as lack of universality, and achieve the effect of improving reachability and speed

Inactive Publication Date: 2013-12-11
CHANGAN UNIV
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Problems solved by technology

In order to solve this contradiction, scholars proposed to project the transmission signal of the cognitive transmitter on the free space sub-channel of the authorized system, but the authorized transmitter must be allocated power according to the water injection method, that is to say, the existing interference-based The aligned spectrum sharing method is only applicable to a small number of cognitive radio networks where authorized users adopt water injection power allocation, and it is not universal

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  • Cognitive radio user space division multiplexing method based on interference alignment
  • Cognitive radio user space division multiplexing method based on interference alignment
  • Cognitive radio user space division multiplexing method based on interference alignment

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Embodiment

[0046] first, figure 2 The specific implementation scenario is given in , where the authorization system is a centralized system, and the number of PUs is K p , each PU has N p One antenna, the number of CUs is 2K c , and constitutes K c communication pairs with 2 CUs in each communication pair: CU k and CU ka , where CU k for CRT, CU ka for CRR, additionally, each CU has N c antennas, and the number of PBS antennas is M. Assume that only one PU is connected to a certain frequency band at a certain moment, that is, figure 2 For the PU shown in , the case where multiple PUs access the same time-frequency resource can be extended from this. At the same time, there is a database (Database) for storing and updating the scheduling information of the authorization system. figure 2 There are three types of links: data transmission link (one-way arrow solid line), interference link (one-way arrow dotted line) and information exchange link (two-way arrow dotted line), wher...

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Abstract

The invention provides a cognitive radio user space division multiplexing method based on interference alignment. According to the cognitive radio user space division multiplexing method based on interference alignment, in the situation that a primary system has certain tolerance against external interference, a cognitive system obtains the tolerance of the primary system against external interference, and the tolerance serves as the reference for the fact that the cognitive system selects cognitive radio users to conduct data transmission. The cognitive system conducts interference elimination on the selected cognitive radio users according to the interference alignment method. When the cognitive radio users are selected, the sum of the maximum possible interference values leaked to the primary system by the cognitive radio users and the tolerance of the primary system against the interference are compared through the Rayleigh quotient characteristics of a channel matrix, and therefore the effect that the interference in the primary system from the selected cognitive radio users is controllable is achieved. By the adoption of the cognitive radio user space division multiplexing method based on interference alignment, the interference alignment technology is widely applied to the cognitive radio network, and the accessibility and the rate of a cognitive radio system are improved.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method for allocating space resources in a cognitive radio system. 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 affecting the normal communication of licensed users. Spectrum sharing is mainly divided into two ...

Claims

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Application Information

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IPC IPC(8): H04W16/14H04W52/42
Inventor 荣玫冯兴乐梁中华靳钊
Owner CHANGAN UNIV
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