Abstract-Diversity is a good way to mitigate fading penalty on modulation performance. cooperative diversity "COD" is one method where the user receives many versions of the same signal from the direct link and relayed links. Another form of diversity is multiuser diversity "MUD" where it operate in the MAC layer instead of the physical layer. The gain obtained by this diversity is a result of using a certain scheduling mechanism. COD and MUD can be combined to gain more...

Reliability is one of the most important concepts in computer networks field. Any network must be supplied with different techniques and methods to guarantee its continuity and functionality under the most sever circumstances. This paper highlights the steps taken at the University of Mosul to enhance the reliability of its computer network. Firstly, the current topology of the network is examined and its resources are investigated. Our methodology suggests supplying the network with different...

ALU is a part of a computer processor that performs arithmetic and logical operations on data. Arithmetic operations are addition, subtraction, division and multiplication. Whereas, logical operation is comparing letters, numbers or special characters. To process data and obtain result, the ALU receives data from other elements of a computer system namely, control unit, registers, memory and Input/Output (I/O) register.Control UnitThe control unit determines when instructions can be executed...

In this study, a modified fuzzy c-means radial basis functions network is proposed. The main purposes of the suggested model are to diagnose the cancer diseases by using fuzzy rules with relatively small number of linguistic labels, reduce the similarity of the membership functions and preserve the meaning of the linguistic labels. The modified model is implemented and compared with adaptive neuro-fuzzy inference system (ANFIS). The both models are applied on "Wisconsin Breast...

Underwater vehicles are expected as the attractive tools for the operation in the extreme environment such as the deep ocean survey. In order to realize the useful and practical robots which can work in the ocean, underwater vehicles should take their action by judging the changing condition from their own sensors and actuators, and are desirable to make their behaviour with limited efforts of the operators, because of features caused by the working environment. Therefore, the underwater...

Mobile technology has been growing at a rapid phase generating larger revenues to the mobile operators. The mobile operators provide faster communication to the users with advanced features and applications with rich content and better display capabilities for an effective communication.1.1 Generations of Mobile TechnologyAs stated by Bodic, The generations of mobile technology are 1G, 2G, 2.5G, 3G, and 4G. (Bodic, 2005). 1G The first generation of mobile technologies was developed in 1980's....

Its easy to think computers just machinery hardware parts that works together. But the specialty of computer comes from another thing that makes them unique. The difficulty with the computers is that most of us don't speak their language; we need a trancelater, something that understand our needs and put to computers to work for us. The trancelater is called software and it is makes computer useful.Like a typewriter, computer without software it's just an unconscious device. By installing...

Ad-hoc network contains a set of wireless nodes without any infrastructure Access Point/Base station support. Caching frequently accessed data items in mobile nodes is shown to be effective techniques to enhance the communication performance in Mobile Ad-hoc Networks (MANETs). The objective of the caching policy is providing efficient data access to users, sometimes it is become a critical issue when data update occurs. When cache techniques are used, data consistency issues must be addressed...

Page replacement aims to produce the lowest error rate pages. There are several different strategies for the page replacement. Selection page will be replaced in the use of these algorithms can be done in various ways, such as by selecting at random, optimal, First In First Out(FIFO),Not Recently Used(NRU) and Least Recently Used(LRU).Selection of a less precise algorithm can lead to increased levels of error pages so that the process will run slower.Information security means protecting...

IEEE 802.11 is the major Wireless Local Area Network standard. This chapter presents an overview of the IEEE 802.11 standard.Wireless Local Area Networks (WLANs) are increasingly at hand in corporate and residential indoor environments. WLAN is not a single radio technology, several different technologies fall into the category called WLAN. This study endeavors to spotlight particularly on the existing industry standard for IEEE 802.11b as the representative example of the WLAN family of...