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

Over recent years, enormous amounts of research in wireless sensor networks (WSNs) have been conducted, due to its multifarious applications such as in environmental monitoring, object tracking, disaster management, manufacturing, monitoring and control In some of WSN applications dependent the energy-efficient and link reliability are demanded Hence, this paper presents a routing protocol that considers these two criteria We propose a new mechanism called Reliable Routing Scheme for Energy-Balanced (RRSEB) to reduce the packets dropped during the data communications It is based on Swarm Intelligence (SI) using the Ant Colony Optimization (ACO) method The RRSEB is a self-adaptive method to ensure the high routing reliability in WSNs, if the failures occur due to the movement of the sensor nodes or sensor node’s energy depletion This is done by introducing a new method to create alternative paths together with the data routing obtained during the path discovery stage The goal of this operation is to update and offer new routing information in order to construct the multiple paths resulting in an increased reliability of the sensor network From the simulation, we have seen that the proposed method shows better results in terms of packet delivery ratio and energy efficiency

RRSEB: A Reliable Routing Scheme For Energy-Balancing Using A Self-Adaptive Method In Wireless Sensor Networks

This paper presents a Digital Signal Processor (DSP) implementation of Digital Pre-distortion (DPD) targeting the 3rd Generation/4th Generation (3G/4G) wireless networks The non-linearity of the Power Amplifier (PA) causes several issues such as Adjacent Channel Interference (ACI), power wastage, high energy consumption, and system inefficiency These shortcomings result in performance limitation for the wireless communications system which is undesirable for the industry DPD is chosen as the PA linearization method due to its overall advantages in Adjacent Channel Power Reduction (ACPR), cost, efficiency, and implementation flexibility The DPD system is developed using the C++ Hardware Programming Language in order to be implemented into the target Digital Signal Processor (DSP), the soft-core Microblaze processor by Xilinx The developed system in C++ is compared with the conventional Matlab Simulation and a performance difference of 0-10dB in ACPR is observed The C++ DSP Implementation is capable of achieving up to 15dB of ACPR for WiMAX signal in 4G networks and 25dB for 2-carrier Wideband Code Division Multiple Access (2C-WCDMA) signals in 3G networks

/pdf/dsp-implementation-of-digital-pre-distortion-in-wireless-3us8a7a1mb.pdf

DSP implementation of Digital Pre-distortion in wireless communication systems

The main goal of mobile IPv6 is that a mobile node is always addressable by its home address, whether it is currently attached to its home link or is away from home. Mobile IPv6 enables applications running on an Internet node to survive physical reconnection by inserting a few additional features at the network layer. In this paper, focus is given to a micro-mobility based test-bed development with improved algorithm. The test-bed consists of both hardware and software, including four PCs and one laptop. The laptop is used as mobile host (MH), two PCs act as access points, one PC becomes the home agent (HA) and one PC is used as a multicast router (ML). This test-bed is used to verify the theoretical enhancement of the micro-mobility handover algorithm via the results (packet loss, handover delay and quality of service). There is no signaling traffic overload between the MH, HA and correspondent host (CH), the handover delay is low, approximately below 10 ms, and the video stream has good reception.

Multicast based and fast handover scheme in mobile IPv6 wireless network

Femtocell is a solution to increase the system capacity and coverage to meet the high demand of the next generation of services on broadband wireless access.However, the deployment of a new femtocell layer may have an undesired impact on the performance of the macrocell layer. The allocation of spectrum resources and the avoidance of electromagnetic interference are some of the more urgent challenges that operators face before femtocells become widely deployed. In this paper different interference avoidance schemes are described and compared. Special attention is paid to the use of uplink and downlink power control and self-configuration and self-optimization techniques for the avoidance of interference.From the review, we conclude that frequency planning is suitable for interference avoidance schemes for unplanned location of femtocells deployment.

	 

	Key words: Femtocell, macrocell, cellular, orthogonal frequency division multiple access, interference avoidance.

Review of interference avoidance schemes in femtocell networks

In integrated multimedia service networks, the charges for bandwidth would vary according to the nature of services provided. Maximization of revenue while maintaining QoS would be a goal for bandwidth allocation. Little attention has been paid to this aspect of network management. Here an effective allocation for multiple charge classes of customers is described.

http://ieeexplore.ieee.org/iel5/3734/10922/00501954.pdf

Borhanuddin Mohd Ali

Papers

RRSEB: A Reliable Routing Scheme For Energy-Balancing Using A Self-Adaptive Method In Wireless Sensor Networks

DSP implementation of Digital Pre-distortion in wireless communication systems

Multicast based and fast handover scheme in mobile IPv6 wireless network

Review of interference avoidance schemes in femtocell networks

Bandwidth allocation in high speed networks with multiple nested charge classes