Journal of Southern Communication Engineering: 1 (23)

Open Access Article

1 - A Combined Method for Dynamic Routing in Mobile Ad-Hoc Networks
Fatemeh Shabih Jalil azimpour Marziye Dadvar

Wireless sensor networks are a large number of sensor nodes with limited energy in a scattered geographically limited area. Due to limited resources in wireless sensor networks, increasing the lifetime of the networks by reducing energy consumption is always considered. More

Wireless sensor networks are a large number of sensor nodes with limited energy in a scattered geographically limited area. Due to limited resources in wireless sensor networks, increasing the lifetime of the networks by reducing energy consumption is always considered. More nodes to send data to the central station energy consumption. Sequential routing based on clustering, this responsibility falls on the head, and this increases the energy consumption of cluster heads. In recent years later all the energy of cluster heads, routing protocols and a lot of clustering is proposed. The purpose of this study, the combination of clustering and routing in order to extend the lifetime of this type of network. For clustering of genetic algorithm with fixed and harmony search algorithm is used for routing. Customize search algorithm for routing in harmony, three criteria neighborhood, reducing energy consumption and proper distribution of energy consumption is taken into account. Harmony algorithm is proposed to establish a proper balance between the criteria listed will generate more efficient routes. Finally change the routing cluster heads in each round will be balancing energy consumption between nodes per cluster. The results of the tests show the superiority of 2.14% proposed increase in messaging as well as 24.84% Lifetime network protocol is DEEC. Manuscript profile

Open Access Article

2 - Investigation of cost reduction of mobility management in cellular networks using user movement model
Mahdiyeh Ahmadi Seyed ali Alaviyan Alireza Malahzadeh

 With the increasing number of mobile network users and the consequent shrinkage of cells to increase network capacity, it can be predicted that position updating procedures and calling a large part of the signaling traffic and radio bandwidth in these networks Wil More

 With the increasing number of mobile network users and the consequent shrinkage of cells to increase network capacity, it can be predicted that position updating procedures and calling a large part of the signaling traffic and radio bandwidth in these networks Will allocate. Therefore, position management methods that explain the two categories of position updating and calling will be important and critical issues in such networks. To improve PBS performance, in this project, a new position management method called MPBS (Mobility Pattern Based Scheme) It is suggested that it also include time information in the user profile. The current position of the user can be determined by his mobility and the current time of the system. The results of using the proposed position management, during the simulation show that the signal load traffic is significantly lightened while reducing the simultaneous call delay. Finds. Manuscript profile

Open Access Article

3 - Low-offset and high-gain up-amp design in analog to digital cyclic converter Twelve bits for CMOS image sensor
Asghar Ebrahimi Mina Shirali

In this paper, an analog-to-digital twelve-bit cyclic converter with high speed and accuracy and yet low power is proposed. Requires a wide dynamic range and high speed and high accuracy, which is suggested in this article. Finally, this circuit was simulated with HSPIC More

In this paper, an analog-to-digital twelve-bit cyclic converter with high speed and accuracy and yet low power is proposed. Requires a wide dynamic range and high speed and high accuracy, which is suggested in this article. Finally, this circuit was simulated with HSPICE software and acceptable results were obtained. This circuit requires a voltage of 3.3 and in The technology is 0.35. The power consumption is 11 mW and the SFDR is 66 dB and the THD is 2 - and the SNDR is 40 dB. Shooting for different setting conditions. Manuscript profile

Open Access Article

4 - Blind speech signal separation based on cumulant approach
Sahar Pouya مصطفی Esmail Beyg R. Hamzehyan

One of the proposed methods for separating several speech signals, which are combined in receivers, is the use of blind source separation (BSS) methods. Resource blind separation is the separation and estimation of signals generated by sources in an unknown channel and More

One of the proposed methods for separating several speech signals, which are combined in receivers, is the use of blind source separation (BSS) methods. Resource blind separation is the separation and estimation of signals generated by sources in an unknown channel and their combinations received at receivers. Existing algorithms for blind source separation are often based on the special analysis of fourth-order cumulative matrices. However, when cumulative matrices have close eigenvalues, their eigenvectors become very sensitive to the error in estimating the matrices. In this paper, we try to reduce this sensitivity by using a new algorithm and obtain a more accurate estimate. Manuscript profile

Open Access Article

5 - extraction defects of radiographic images using local information in transform domain
zahra mousavi Ahmad Keshavarz

Radiography is one of most common methods for testing the quality of weld. At present radiographic images are interpreted by humans. In order to increase accuracy and speed of interpretation and costs decrease ,We are looking for a way to automatic detect of weld d More

Radiography is one of most common methods for testing the quality of weld. At present radiographic images are interpreted by humans. In order to increase accuracy and speed of interpretation and costs decrease ,We are looking for a way to automatic detect of weld defects. The correct extraction of defects is The most important step to automatic processing.  Therefore ,in this paper a new strategy to extract the weld defects using image processing techniques is proposed.  In the proposed method after segmentation Region Of Interest (ROI), histogram matching and Weiner filter were used to remove noise and enhance the quality of image, then For optimum utilization of image data in different directions, Wavelet transform is used. Afterward by applying techniques such as local thresholding, morphology and edge detection on the components of the wavelet transform defect area of Radiography images was extracted Manuscript profile

Open Access Article

6 - Investigation algorithm of optical radius diffusion analysis with finite difference
Ayat Akbari Mohsen Kamyar Nooshin Rabiee Ali Bekter

Our aim in this paper is to provide methods for obtaining the field distribution at the tip of a narrowed dual-core fiber. One of the most important of these methods is the finite difference method. To use the finite difference method, we have two analyzes, one is light More

Our aim in this paper is to provide methods for obtaining the field distribution at the tip of a narrowed dual-core fiber. One of the most important of these methods is the finite difference method. To use the finite difference method, we have two analyzes, one is light scattering analysis, both of which use Maxwell wave equations. Manuscript profile

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