نشریه مهندسی مخابرات جنوب
پیاپی 22 (زمستان 1395)

The standard form of implementing a limited-diffusion light-beam emission method is the Cranks-Nixon method. The implementation of the transverse electric field TE is described by the optical radius propagation algorithm. Both FD-BPM and FD-MS analyzes use the approximation of the waveguide structure and the optical field to a network of samples.

The concepts of genetic algorithm are based on Darwin's theory of inheritance. The genetic algorithm mimics the evolutionary concept of generational survival. If the population develops through generations of individuals, the overall competence of the group will increase. If certain individuals are not competitive enough to survive, they are doomed to die and their genetic traits removed from the population. So the genetic algorithm method is a nature-inspired method. Below we define the concepts used in this method and explain the method of finding optimal solutions using genetic algorithm.

Due to the increase in communications, mobile networks are expanding day by day and significant progress has been made in this regard. In this regard, the first to fourth generation of mobile phones have been created. The second generation GSM (Global System for Mobile communications) It is the most popular mobile phone system in the world and according to the latest published news, now more than 500 million people in more than 150 countries use this system. In our country, the network also uses GSM. On the other hand, because the mobile system has an interface It uses air for transmission and the air interface is very vulnerable, network security is doubly important. . The BTS peripheral network is considered as a controlled environment, as access to this part of the network is controlled by service providers. The access network (connecting ME / MS to BTS) is the only network that is a malicious operating environment. Therefore, the goal is to create security in this part of the GSM network.

In this paper, different estimation methods for signal radiation will be investigated. We will divide these methods into several categories. The first category is conventional or classical methods that do not affect the signal and noise properties and only estimate the signal direction according to the power of the array. The second category of these methods is called subspace methods or methods based on special vectors. Other methods are maximum correct methods

Much research has been done on open-loop DVR control strategies. Although open loop control has a fast dynamic response, due to the presence of a DVR filter, the load voltage waveform has sharp fluctuations with high uplift and poor attenuation. All proposed DVR methods are based on classical closed loop control (load voltage feedback) and are implemented using sinusoidal modulation in abc coordinates. The purpose of this paper is to implement the minimum energy strategy using space vector modulation. For this purpose, a new algorithm is proposed to implement the minimum energy strategy in dq coordinates. Then, due to the weak attenuation of the dynamic response of the open-loop DVR control and its mean state error, to improve the dynamic response characteristics and reduce the steady-state error, the closed loop control with load voltage feedback and the inner loop with capacitor current feedback feedback of DVR filter is used.

In general, photonic crystals are structures of materials whose electrical and magnetic permeability changes periodically in one, two, or three dimensions. When such structures are exposed to radiation of a beam with a wavelength comparable to the period of crystal spatial rotation, two modes occur.