It is shown that, particularly for terrestrial cellular telephony, the interference-suppression feature of CDMA (code division multiple access) can result in a many-fold increase in capacity over analog and even over competing digital techniques. A single-cell system, such as a hubbed satellite network, is addressed, and the basic expression for capacity is developed. The corresponding expressions for a multiple-cell system are derived. and the distribution on the number of users supportable per cell is determined. It is concluded that properly augmented and power-controlled multiple-cell CDMA promises a quantum increase in current cellular capacity. >

On the capacity of a cellular CDMA system

Praise for the Third Edition: "This is one of the best books available. Its excellent organizational structure allows quick reference to specific models and its clear presentation . . . solidifies the understanding of the concepts being presented."IIE Transactions on Operations EngineeringThoroughly revised and expanded to reflect the latest developments in the field, Fundamentals of Queueing Theory, Fourth Edition continues to present the basic statistical principles that are necessary to analyze the probabilistic nature of queues. Rather than presenting a narrow focus on the subject, this update illustrates the wide-reaching, fundamental concepts in queueing theory and its applications to diverse areas such as computer science, engineering, business, and operations research.This update takes a numerical approach to understanding and making probable estimations relating to queues, with a comprehensive outline of simple and more advanced queueing models. Newly featured topics of the Fourth Edition include:Retrial queuesApproximations for queueing networksNumerical inversion of transformsDetermining the appropriate number of servers to balance quality and cost of serviceEach chapter provides a self-contained presentation of key concepts and formulae, allowing readers to work with each section independently, while a summary table at the end of the book outlines the types of queues that have been discussed and their results. In addition, two new appendices have been added, discussing transforms and generating functions as well as the fundamentals of differential and difference equations. New examples are now included along with problems that incorporate QtsPlus software, which is freely available via the book's related Web site.With its accessible style and wealth of real-world examples, Fundamentals of Queueing Theory, Fourth Edition is an ideal book for courses on queueing theory at the upper-undergraduate and graduate levels. It is also a valuable resource for researchers and practitioners who analyze congestion in the fields of telecommunications, transportation, aviation, and management science.

Fundamentals of Queueing Theory

Information Theory and Reliable Communication

This document provides updates to IEEE Std 802.16's MIB for the MAC, PHY and asso- ciated management procedures in order to accommodate recent extensions to the standard.

IEEE Standard for Local and Metropolitan Area Networks Part 16: Air Interface for Fixed Broadband Wireless Access Systems Draft Amendment: Management Information Base Extensions

Ultra Wideband Signals and Systems in Communication Engineering

Appropriate routing for supporting the requirements of various high quality applications emerged in current communication networks is a challenging problem that can lead to improved routing algorithms. Taking into consideration the highly distributed character of networks, numerous multi-agent based algorithms, and particularly ant colony based algorithms, have been proposed in recent years. However, considering the need for decreasing overhead and increasing the scalability of these algorithms remains an elusive challenge. Our goal here is to reduce the overhead and the process complexity in nodes by decreasing the size of routing tables of network nodes in an innovative manner. More specifically, data routing tables which are established in the AntNet algorithm and keep the information of all destination nodes in network convert to tables that only keep the information of popular destinations of network. The resulting algorithm, the ‘‘D-T-SAntNet,’’ is then simulated via Omnet++ onUUNET network topology. The network performance is evaluated under various node-failure and node added conditions. Statistical analysis of results confirms that the new method can significantly reduce the average packet delivery time and rate of convergence to the optimal route when compared with standard AntNet.

http://www.ijarcs.info/index.php/Ijarcs/article/download/1863/1851

An efficient innovative method to decrease routing table size in packet switched networks

In this paper, a low complexity multi-layered space frequency OFDM (MLSF-OFDM) coding scheme is presented with the proposed two detection algorithms, fast QR decomposition detection algorithm or denoted as FAST-QR and enhanced FAST-QR (E-FAST-QR). Both algorithms not only reduce the implementation complexity of QR decomposition but also show a good performance in terms of bit error rate (BER). Hence, the proposed detection algorithms can be used to maintain guaranteed quality of service (QoS) in MIMO-OFDM system.

/pdf/a-low-complexity-multi-layered-space-frequency-coding-4mqmiikrad.pdf

A low complexity multi-layered space frequency coding detection algorithm for MIMO-OFDM

Broadcasting or flooding is one of the principal functions in wireless ad-hoc networks In broadcasting, a mobile node sends the same message to all nodes in the network in one-to-all model Broadcasting based on set of dominating nodes is remunerative approach, where the broadcasting activity is constrained to only the nodes in the dominating set A set is dominating if all nodes in the network are either in the set or neighbors of nodes in the set In this study, the notion of constructing connected-dominating-set is extended to ad-hoc networks with unidirectional links An enhanced distributed algorithm is presented that is based on the marking process which is has been introduced in earlier work Our enhanced algorithm features a good locality properties since it need only 2-hop neighborhood information within each node The algorithm checks for the mutual existence of nodes in the neighbor table of their neighbors to guarantee the symmetric connectivity between neighboring nodes The proposed algorithm is integrated with AODV routing protocol to generate a connected dominating set that will be responsible on flooding activity The efficiency of our approach is investigated and verified through simulation whereas the computational complexity is determined and compared with that of original marking process All the simulations run are carried out with QualNet Simulator version 502

/pdf/enhanced-marking-process-emp-for-constructing-dominating-set-4hlpcu6fkr.pdf

Enhanced Marking Process (EMP) for Constructing Dominating Set in Mobile ad-hoc Networks with Unidirectional Links

Smart antenna, which improves the performance of wireless systems, suppress all interfering signals, and increase the system capacity. The objective of this paper is to provide an analysis of system capacity when using smart antenna with the orthogonal code. A new technique, which uses orthogonal codes in multiple beams to distinguish multiuser is introduced. The properties of linkair communications' large area synchronous (LAS) or smart codes, which are claimed to be fully orthogonal code and are used to combat major interferences, are studied. The effect of spatial multiple beams in an area where density of users is very condense in a cell is also examined. Finally, the system performance in term of system capacity is presented.

Smart antenna system with orthogonal codes

This paper deals with the preliminary study on code division duplexing (CDD) system in wireless network using adaptive smart antenna. In particular, we proposed a new technique to mitigate the co-channel interference problem through multiple beams with adaptive power control. Base on this study, some other impairments such as multipath fading and delay spread in wireless environment could be overcame easily by introducing smart code with some time shift in CDD system.

Borhanuddin Mohd Ali

Papers

An efficient innovative method to decrease routing table size in packet switched networks

A low complexity multi-layered space frequency coding detection algorithm for MIMO-OFDM

Enhanced Marking Process (EMP) for Constructing Dominating Set in Mobile ad-hoc Networks with Unidirectional Links

Smart antenna system with orthogonal codes

Preliminary study on CDD system using smart antenna