A Design Method of Secure Beamforming Based on Energy Harvesting Cognitive Network
A technology of energy harvesting and beamforming, applied in the field of communication security, can solve the problem of optimizing the allocation of energy harvesting time and information processing time, not considering it, etc.
Active Publication Date: 2019-11-29
CENT SOUTH UNIV
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Problems solved by technology
The above analysis of the collaborative cognitive network based on energy harvesting is only limited to the SISO model, and does not consider how to optimize the allocation of energy harvesting time and information processing time
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Embodiment 1
[0038] By designing a wireless sensor network or an indoor environment where WiFi and ZigBee share 2.4GHz frequency band resources, WiFi and ZigBee perform data transmission for the primary user and secondary user respectively, and the simulation tool uses matlab.
[0039] Such as figure 1 As shown, a design method based on secure beamforming in an energy harvesting cognitive network includes the following steps:
[0040] Step 1: Taking the energy harvesting time ratio as the optimization variable and maximizing the transmission rate of the secondary user system as the optimization goal, construct a security beamforming design optimization problem based on energy harvesting cognitive wireless network, so that the primary user system can meet the security communication quality requirements And the transmission power of the transmitter of the secondary user system satisfies the safety communication limit.
[0041] Such as figure 2 As shown, a primary system communicates coope...
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The invention discloses a design method for safe beam forming based on an energy harvesting cognitive network. The design method comprises the steps of firstly establishing a problem of target optimization for the maximum transmission rate of a secondary user system in a cognitive wireless network by taking the energy harvesting time ratio as a variable; secondly, transforming the problem of target optimization into a problem of semi-definite relaxation by using a matrix conjugate transposition principle, and transforming the problem of semi-definite relaxation into a problem of convex optimization in an equivalent manner by adopting a Charnes-Cooper; and finally, acquiring a globally optimal solution comprising a forwarding beam forming vector and a cognitive beam forming vector through one-dimensional search for the energy harvesting time ratio, and thus solving safe rates of a primary user and a secondary user, and completing design for safe beam forming of the cognitive wireless network. The design method disclosed by the invention greatly simplifies the design process. In addition, the solving scheme not only can prevent interception of an eavesdropping user for confidential information, but also can realize increase in transmission rate at the same time, and effectively improves the performance of the system.
Description
technical field [0001] The invention belongs to the field of communication security, and in particular relates to a design method of a secure beamforming based on an energy harvesting cognitive network. Background technique [0002] Facing the ever-increasing demand for wireless transmission, spectrum resources have become a scarce resource. The emergence of cognitive wireless networks has effectively improved the spectrum efficiency of wireless networks. Using the secondary user (SU) for cooperative transmission can not only improve the data transmission of the primary user (PU) with less resource consumption, but also the SU can use part of the spectrum resources of the primary user to transmit its own information, so as to achieve a win-win situation. Effect. However, in some practical application scenarios, the cooperative communication between PU and SU will be limited. For example, when the sensor is used as a cooperative relay, due to the limited capacity of the batt...
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IPC IPC(8): H04B7/0413
CPCH04B7/043
Inventor 董健石振弘唐锟
Owner CENT SOUTH UNIV