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A power distribution method for cognitive system constrained based on transmitting antenna power

A cognitive system and transmitting antenna technology, applied in power management, wireless communication, electrical components, etc., can solve problems such as not considering antenna transmitting power

Active Publication Date: 2015-01-28
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, the calculated optimal beamforming vector does not take into account the actual transmit power capability of each antenna, but in some cases, in order to optimize the system, the transmit power required by some antennas may exceed the transmit power The transmitting ability of the antenna itself, so it needs to be further improved

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  • A power distribution method for cognitive system constrained based on transmitting antenna power
  • A power distribution method for cognitive system constrained based on transmitting antenna power
  • A power distribution method for cognitive system constrained based on transmitting antenna power

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Embodiment Construction

[0029] Further set forth the present invention below in conjunction with accompanying drawing:

[0030] figure 1 It is a system model diagram of the present invention. Consider a cognitive wireless communication system, which includes a cognitive base station with M antennas, K cognitive users with a single antenna, and L primary users with a single antenna. PU (Primary User) and SU (Secondary User) represent primary users and cognitive users, respectively. The signal received by the kth cognitive user can be expressed as:

[0031] y k s = Σ i = 1 K h k t i u i + n k

[0032] Among them, k=1...K, where u k Represents the signal sent by the cognitive base station to the kt...

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Abstract

The present invention discloses a power distribution method for cognitive system constrained based on transmitting antenna power. The method mainly includes: first establishing a power distribution optimization problem of a cognitive base station terminal, and next, solving the optimal beam forming vector according to system parameters, thereby determining a user transmitting power and the transmitting power distributed to each antenna. The method specifically includes: the established optimization problem takes the minimum system total transmitting power as the optimization target, and the constraining terms are: constraining the interference of the main user, constraining an SINR of the cognitive user and constraining the transmitting power of each transmitting antenna of the cognitive base station terminal. Since during the actual communication process, all ends of each antenna of the base station terminal will be provided with power amplifiers, and the abilities of transmitting power of the antennas are different from each other, the present inventions considers the constraining of the power of each antenna more conforms to the actual situation, and it has a certain degree of practical values.

Description

technical field [0001] The invention relates to a cognitive system power allocation method based on transmitting antenna power constraints, and belongs to the field of cognitive radio communication. Background technique [0002] After investigation, the Federal Communications Commission (FCC) of the United States found that the wireless spectrum resources have not been fully utilized. At the end of 2003, the FCC pointed out that the utilization rate of the currently allocated frequency bands ranges from 15% to 85%, and some frequency bands are overloaded. (such as mobile phone network frequency bands), but quite a few frequency bands such as amateur radio are not fully used. In the 21st century, with the rapid development of wireless communication technology, the scarcity of spectrum resources has become increasingly severe. In order to solve this problem, Dr. J.Mitola proposed the concept of cognitive radio in his doctoral dissertation in 1999. He described how cognitive ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/34
CPCH04W52/34H04W72/0473
Inventor 刘旭朱文涛杨京波
Owner NANJING UNIV OF POSTS & TELECOMM
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