International Journal of Computer and Applications

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

Advances in wireless communication technologies, such as wearable and implantable biosensors, along with recent developments in the embedded computing area are enabling the design, development, and implementation of body area networks. This class of networks is paving the way for the deployment of innovative healthcare monitoring applications. In the past few years, much of the research in the area of body area networks has focused on issues related to wireless sensor designs, sensor miniaturization, low-power sensor circuitry, signal processing, and communications protocols. In this paper, we present an overview of body area networks, and a discussion of BAN communications types and their related issues. We provide a detailed investigation of sensor devices, physical layer, data link layer, and radio technology aspects of BAN research. We also present a taxonomy of BAN projects that have been introduced/proposed to date. Finally, we highlight some of the design challenges and open issues that still need to be addressed to make BANs truly ubiquitous for a wide range of applications.

Body Area Networks: A Survey

The problem of idle listening is one of the most significant sources of energy consumption in wireless sensor nodes, and many techniques have been proposed based on duty cycling to reduce this cost. In this paper, we present a new asynchronous duty cycle MAC protocol, called Receiver-Initiated MAC (RI-MAC), that uses receiver-initiated data transmission in order to efficiently and effectively operate over a wide range of traffic loads. RI-MAC attempts to minimize the time a sender and its intended receiver occupy the wireless medium to find a rendezvous time for exchanging data, while still decoupling the sender and receiver's duty cycle schedules. We show the performance of RI-MAC through detailed ns-2 simulation and through measurements of an implementation in TinyOS in a testbed of MICAz motes. Compared to the prior asynchronous duty cycling approach of X-MAC, RI-MAC achieves higher throughput, packet delivery ratio, and power efficiency under a wide range of traffic loads. Especially when there are contending flows, such as bursty traffic or transmissions from hidden nodes, RI-MAC significantly improves throughput and packet delivery ratio. Even under light traffic load for which X-MAC is optimized, RI-MAC achieves the same high performance in terms of packet delivery ratio and latency while maintaining comparable power efficiency.

/pdf/ri-mac-a-receiver-initiated-asynchronous-duty-cycle-mac-4rb0jcbw11.pdf

RI-MAC: a receiver-initiated asynchronous duty cycle MAC protocol for dynamic traffic loads in wireless sensor networks

http://www.inf.ufes.br/~zegonc/material/Redes%20de%20Sensores%20sem%20Fio/MAC%20in%20WSN.pdf

Medium access control in wireless sensor networks

Application of molecular communication (MC) is claimed almost in every field of humanity, be it medicine, be it security, or be it industry. However, the channel is the biggest impairment of any wireless. On the other hand, forward error correction (FEC) is found as the most worth full technique to improve performance due to channel degradation. Though various literature has proposed Hamming codes for MC, none of the literature has presented the implementation of it in any of the VLSI tools. This paper, however, implements an encoder of Hamming code using CMOS logic circuits for different values of parity-check bits (m). Specifically, we have considered m = 3 and m = 5 to implement the Hamming code. Further, power and delay analysis are presented and verified through simulations in 250 nm CMOS technology using Tanner EDA Tool.

VLSI Implementation of Hamming Code for Molecular Communication

Objective: Spectrum shortage and Inter Cell Interference (ICI) are two factors which limits the performance of wireless cellular networks. Methods/Analysis: One of the popular methods is Soft Frequency Reuse which effectively controls the spectrum management and reduces the ICI for wireless networks. In conventional static Soft Frequency Reuse (SFR) scheme, transmission power in cell and allocation of subcarriers are fixed during the system deployment, which affects the performance of system. Findings: This paper focuses Intercell Resource Allocation algorithm, which is dynamic in nature and optimizes both subcarrier and transmission power for cellular network. Novelty/Improvement: Intercell Resource Allocation algorithm result in greater improvement in data rate and system capacity.

Spectrum Sharing and Inter Cell Interference Mitigation in Wireless Cellular Networks

Molecular Communication (MC) has been evolved as a new paradigm of communication due to its bio and nano compatibility. Its application in the healthcare includes detection and monitoring of bimolecular disease along with intelligent drug delivery. However, like any communication system information capacity is of prime concern. In this paper we have proposed novel information theoretic analysis of MC system. In particular analytical expression of information capacity is presented by considering spherical biological system. It is noteworthy to mention that concentration Green function (CGF) has been used to derive the proposed expression of capacity. Proposed expression is novel and never presented in the literature till the date. Also, Numerical analysis shows perfect agreement with the theoretical back ground of MC.

Information Capacity Analysis of DMC under Spherical Biological System

In this article, we investigate the application of wavelet packet transform (WPT) for spectral estimation and analysis. The main attraction for the method is the tradeoffs it offers in terms of satisfying various figure of merits such as high frequency resolution, good side lobe suppression and low variations in the estimated power spectral density (PSD). The performance of the system is evaluated through computer simulations. The results of the experiments show that the wavelet based approach offers great flexibility and adaptability apart from its performances which are comparable and at times even better than Fourier based estimates.

A study on the performance of wavelet packets for spectral analysis

Free space optical (FSO) communication system is a technology in the field of wireless communication which provides unlicensed transmission of data, bandwidth scalability and high data rate for shorter range. Atmospheric turbulence in link-area is major factor of determining performance of the system. Here, double generalized gamma (GG) distribution is used to model the irradiance fluctuations covering all atmospheric turbulent conditions. We analyse performance of the system with polarization shift keying (PolSK) modulation scheme under moderate and strong atmospheric turbulent conditions with plane and spherical wave. Further, we compare results of PolSK modulation with on–off keying (OOK) modulation. From the simulation results, it is seen that system with PolSK modulation gives 51% and 37% improvement over OOK modulation scheme under moderate and strong turbulent conditions, respectively, for plane wave and shows 53% and 48% improvement over OOK modulation scheme under moderate and strong turbulent conditions, respectively, for spherical wave.

M. K. Lakshmanan

Papers

VLSI Implementation of Hamming Code for Molecular Communication

Spectrum Sharing and Inter Cell Interference Mitigation in Wireless Cellular Networks

Information Capacity Analysis of DMC under Spherical Biological System

A study on the performance of wavelet packets for spectral analysis

Performance Analysis of Free Space Optical Communication System Over Double Generalized Gamma Distribution with Polarization Shift Keying Modulation