Subcarrier bit joint optimization method capable of compromising energy efficiency and spectrum efficiency in cognitive radio
A cognitive radio and joint optimization technology, applied in the direction of modulated carrier system, electrical components, spectrum gap evaluation, etc.
Active Publication Date: 2018-04-20
东开数科(山东)产业园有限公司
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[0006] The purpose of the present invention is to solve the problem that energy efficiency and spectrum efficiency need to be optimized at the same time in the case of high spectrum occupancy in cognitive wireless networks, and proposes a subcarrier bit joint optimization method for the compromise between energy efficiency and spectral efficiency in cognitive radio
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[0077] figure 1 Multi-resource joint allocation and spectrum sharing scenario graph for multi-cognitive users. The Cognitive Base Station (CBS) conducts centralized fusion judgment on the local spectrum sensing of multiple distributed SUs, and broadcasts the judgment result. If the CBS judgment result is that the PU does not use the frequency band, the SU accesses the PU spectrum in a cross-shared manner. . If the judgment result is that the PU is using the frequency band, then under the condition of ensuring the normal communication of the PU, the SU adaptively adjusts the transmission power and occupied subcarriers, etc., and opportunistically accesses the PU spectrum in an overlapping sharing manner. At the same time, energy efficiency or spectrum efficiency is taken as the optimization target, and the subcarrier and bit allocation is carried out considering the rate fairness ratio among each SU and the transmission channel gain (or channel fading factor, etc.) of each SU....
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The invention discloses a subcarrier bit joint optimization method capable of compromising energy efficiency and spectrum efficiency in cognitive radio. The method comprises the steps of firstly building a weighted compromise function of the energy efficiency and the spectrum efficiency of a cognitive wireless network for system modeling while considering that data transmission adopts a multi-system phase shift keying modulation mode; then distributing subcarriers to each user under the condition of satisfying a fairness ratio of each cognitive user information transmission rate; and finally,distributing bits to each cognitive user based on the two classical bit distribution algorithm. According to the subcarrier bit joint optimization method capable of compromising energy efficiency andspectrum efficiency in cognitive radio, the original two single-user classical bit distribution algorithms are extended to a multi-user subcarrier bit joint optimization distribution method, the subcarrier bit distribution results of a cognitive wireless network are subjected to comparative analysis, and an energy efficiency-spectrum efficiency compromise relationship curve during the subcarrier bit optimization distribution is given at the same time. The subcarrier bit joint optimization method capable of compromising energy efficiency and spectrum efficiency in cognitive radio can realizes balance of the energy efficiency and the spectrum efficiency of a cognitive wireless network system.
Description
technical field [0001] The invention belongs to the technical field of information and communication engineering, and proposes a sub-carrier bit joint optimization method in which energy efficiency and spectrum efficiency are compromised in cognitive radio. This method involves a resource allocation scheme in which energy efficiency (Energy Efficiency, EE) and spectrum efficiency (Spectral Efficiency, SE) are compromised in a cognitive radio network (Cognitive Radio Network, CRN). Cognitive user subcarrier bit joint optimal allocation method. Background technique [0002] Due to the shortage of social resources at the present stage and the promotion of energy saving and emission reduction, the spectrum efficiency and energy efficiency in wireless systems have received extensive attention. According to a study by the Federal Communications Commission (FCC), the spectrum utilization rate of spectrum below 3 GHz in most cities in the United States is between 15% and 85%, while...
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IPC IPC(8): H04L27/00
CPCH04L27/0006
Inventor 许晓荣伍伟伟
Owner 东开数科(山东)产业园有限公司