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

will increase the signalling exchanges between the serving eNB and the target eNB, resulting in increased ICI. This is overcome by means of our proposed Soft Frequency Reuse (SFR). Simulation results using LTE-Sim show that the outage probability and delay are reduced by 24.4% and 11.9% respectively, over the HHO method, which is quite significant.

https://www.onlinelibrary.wiley.com/doi/pdf/10.4218/etrij.14.0113.0947

Reduction of Outage Probability Due to Handover by Mitigating Inter-cell Interference in Long-Term Evolution Networks

In this paper, we consider a V-BLAST/STBC wireless communication architecture, which integrates Alamouti space-time block codes (STBC) layer with vertical Bell-labs layered space-time (V-BLAST) layer, in MIMO wireless communication system with four transmitter and three receiver antennas over Rayleigh flat-fading channel. We propose an algorithm, which combines the algorithm of successive interference cancellation zero-forcing (SIC ZF) and successive interference cancellation zero-forcing with maximum a posteriori probability (SIC ZF MAP). The proposed algorithm (SIC ZF / ZF MAP) reduces the complexity if compared with the algorithm of SIC ZF MAP alone. Simulation results show the symbol error rate performance degradation of the proposed algorithm is small compared to SIC ZF MAP detection.

Joint Optimal Detection of Ordering SIC ZF and SIC ZF MAP for V-BLAST/STBC Wireless Communication Systems

Energy efficient spectrum sensing and data communication to extend the lifetime of cognitive radio sensor network is becoming increasingly important due to resource constraint of CR-WSN inherent from WSN. This paper presents an energy-aware clustering (EAC) algorithm that enhances spectrum sensing performance and reduces network energy consumption thereby prolonging lifetime of the network. We derived network wide energy consumption model in terms of spectrum sensing energy consumption, intra cluster and inter clusters energy consumptions, and then determined the optimal number of clusters for the network. Through numerical analysis, we evaluate the effectiveness of the proposed algorithm in terms of minimizing network wide energy consumption and improving spectrum sensing performance.

/pdf/energy-aware-cluster-based-cooperative-spectrum-sensing-for-3rytta1gzw.pdf

Energy-aware cluster based cooperative spectrum sensing for cognitive radio sensor networks

This paper presents a wireless remote controller in which providing a wireless sensing solution for home users to operate essential household appliances, ranging from simple lightings to sophisticated electronic devices. A wireless protocol based on wireless token ring protocol (WTRP) has been modified, yielding wireless controller area network (WCAN) data centric communications, which is then proposed to be applied in managing concurrency control of home appliances. WCAN is an adaptation of its wired cousin, controller area network (CAN) protocol which has not being properly defined. The wireless controller communicates with the standalone server which in turn communicates with the rest of sensing nodes through WCAN system. Each node will be receiving command from the standalone server and based on the message identifier, either executing the command or discarding it. WCAN has been chosen to become the backbone network of the system as it offers an alternative solution when industrial mobile stations under certain constraints should continue to use CAN protocol as frame exchange protocol.

/pdf/home-appliances-controller-using-wireless-controller-area-2nok644ekx.pdf

Home appliances controller using wireless controller area network (WCAN) system

Wireless Embedded Internet aims for efficient connectivity for embedded devices to the internet. This requires the embedded devices to run IPv6 protocol. The 6LoWPAN was introduced to enable IPv6 internet connectivity for WPAN. Enabling IPv6 in wireless, small size, low power, low rate, limited memory and limited computation capabilities devices, with a limited frame size, is not directly applicable. The relatively huge header size of upper layers' protocols (e.g. TCP, UDP and IPv6), in addition to IEEE 802.15.4 header, will deplete the frame payload to approximately 33 bytes. Some schemes had been designed to compress the headers to provide more space for the data payload. In this paper, we present a header compression scheme for 6LoWPAN network. The scheme exploits the correlation between the first and the subsequent fragments' headers. Hence, the redundant headers that are transmitted within the first fragment will not be carried again within the second and the subsequent fragments. Second and Subsequent Fragments Headers Compression Scheme (S&SFHC) can either work as a standalone technique or be integrated with other compassion techniques. However, in this paper, we assess the standalone scheme where the scheme is not integrated with other compression scheme. The performance of the S&SFHC is evaluated based on packet delivery ratio, total charged consumed, average throughput and average delay. It achieved 20%, 6%, 26% and 6% better performance in terms of packet delivery ratio, total charged consumed, average throughput and average delay compared to LOWPAN_IPHC as increasing the size of fragmented packets.

/pdf/second-and-subsequent-fragments-headers-compression-scheme-4r75tjvcur.pdf

Borhanuddin Mohd Ali

Papers

Reduction of Outage Probability Due to Handover by Mitigating Inter-cell Interference in Long-Term Evolution Networks

Joint Optimal Detection of Ordering SIC ZF and SIC ZF MAP for V-BLAST/STBC Wireless Communication Systems

Energy-aware cluster based cooperative spectrum sensing for cognitive radio sensor networks

Home appliances controller using wireless controller area network (WCAN) system

Second and subsequent fragments headers compression scheme for IPv6 header in 6LoWPAN network