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Power allocation method of cognitive decode-and-forward relay system

A relay system, decoding and forwarding technology, applied in the field of wireless communication, can solve the problem of not considering the interference power and so on

Active Publication Date: 2016-06-01
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0007] None of the above applications considered how to calculate the interference power generated by the secondary user to the primary user when the channel state information between the SU and the PU is unknown

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  • Power allocation method of cognitive decode-and-forward relay system
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  • Power allocation method of cognitive decode-and-forward relay system

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Embodiment Construction

[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0033] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also be understood that terms such as those defined in commonly used dictionaries should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as herein Explanation.

[0034] Consider a cognitive OFDMA (Orthogonal Frequency Division Multiple Access, OFDMA) relay system, which includes a secondary user transmitter (Secondary User Transmitter, SUT), a secondary u...

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Abstract

The invention discloses a power allocation method of a cognitive decode-and-forward relay system, and belongs to the technical field of wireless communication. The actual situation that channel state information between a secondary user and a primary user is difficult to accurately acquire is considered, and the interference power constraint conditions of a secondary user transmitter on the primary user determined according to statistical information between the secondary user and the primary user under the condition that the channel state is unknown and the interference power constraint conditions of a relay on the primary user determined according to statistical information between the relay and the primary user are introduced in the process of optimizing the power allocation scheme in the cognitive decode-and-forward relay system. Firstly equivalent transformation of statistics of the interference constraint conditions is performed and then an original optimization problem is converted into an equivalent convex optimization problem by introducing variables. With application of the method, relatively high system energy efficiency can be acquired under the condition of guaranteeing communication quality of the primary user.

Description

technical field [0001] The invention discloses a power distribution method of a cognitive decoding and forwarding relay system, and belongs to the technical field of wireless communication. Background technique [0002] With the rapid development of wireless communication technology, the spectrum becomes more and more scarce, and the traditional spectrum management methods cannot meet the actual needs. In order to solve the problems of scarcity of spectrum resources and low spectrum utilization rate, a cognitive radio (Cognitive radio, CR) technology is proposed. At the same time, because relay communication technology can reduce multipath fading and increase channel capacity, relay communication technology is becoming one of the key technologies for space diversity in wireless communication systems. Therefore, combining the relay communication technology with the CR can further improve the performance of the wireless network. [0003] Traditional research on cognitive rel...

Claims

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Application Information

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IPC IPC(8): H04W52/24H04W52/34H04W52/46
CPCH04W52/244H04W52/346H04W52/46
Inventor 左加阔左超
Owner NANJING UNIV OF POSTS & TELECOMM
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