Bandwidth Estimation in Network Probing Techniques Utilizing Min-Plus Algebraic Methods
Diagnosis of Anemia using Non-Invasive Anemia Detector through Parametrical Analysis
The Effectiveness of Jaya Optimization for Energy Aware Cluster Based Routing in Wireless Sensor Networks
Stress Analysis and Detection from Wearable Devices
Intrusion-Tolerant Sink Configuration: A Key to Prolonged Lifetime in Wireless Sensor Networks
Channel Estimation and It’s Techniques: A Survey
Performance Evaluation of Advanced Congestion Control Mechanisms for COAP
Impact of Mobility on Power Consumption in RPL
Implementation of Traffic Engineering Technique in MPLS Network using RSVP
FER Performance Analysis of Adaptive MIMO with OSTBC for Wireless Communication by QPSK Modulation Technique
DGS Based MIMO Microstrip Antenna for Wireless Applications
A Review on Optimized FFT/IFFT Architectures for OFDM Systems
Balanced Unequal Clustering AlgorithmFor Wireless Sensor Network
HHT and DWT Based MIMO-OFDM for Various ModulationSchemes: A Comparative Approach
Study and Comparison of Distributed Energy Efficient Clustering Protocols in Wireless Sensor Network: A Review
Diagnosis of Anemia using Non-Invasive Anemia Detector through Parametrical Analysis
Radio Communication Networks rely on the radio frequency spectra which are the set of frequencies ranging from3 KHz to 300 GHz. With increasing demand for wireless communication, this radio frequency spectra has become an expensive commodity. Thus, the efficient use the spectrum resources have become an essential issue. The alternative to inefficient fixed spectrum allocation is the sharing of the spectra amongst the licensed and unlicensed users. Cognitive radio, which is a form of wireless communication is the key technology which provides the best solution by allowing a group of secondary users to share the radio spectrum originally allocated to the primary users. This sharing of the spectrum is termed as Dynamic Spectrum Access (DSA) or Dynamic Spectrum Allocation. The major components of the DSA are the spectrum sensing, spectrum decision, spectrum sharing and spectrum mobility.Management of these tasks collectively is termed as spectrum management. These tasks are handled with the assistance of different layers of the OSI model namely, physical layer, link layer, network layer, transport layer and application layer. This paper reviews the role of different layers of the OSI model in the working of a cognitive radio leading to spectrum management.
Code division for multiple access is a key technology used in the 3 Generation (3G) wireless technologies. CDMA is a multiple access technology in which, different users are allocated with different codes. There is an increasing use of CDMA for mobile networks, where the current CDMA service covers 10million users, with the expectation of more than 100 million within the first decade of the next century, without new spectrum allocation. This paper analyses some interesting properties of PN sequence and further elaborates about various methods of generation of PN sequences. This paper will be discussing about, Nomenclature of CDMA, CDMA at transmitter and receiver sections, CDMA as Spread Spectrum System, Code generation in CDMA, CDMA codes, properties and PN sequences and Bit Error Rate ( BER ) ofCDMA.
In this paper, a novel approach of multi band planar inverted-F Antenna for wireless communication applications has been presented. The multi band antenna has been designed by using one rectangular parasitic element which is placed under I - slotted radiating element to achieve multiband operating frequencies. This multi band PIFA can be operated at various operating frequencies which are PCS1900 UL Band (1.90 GHz), IMT – E2600 (2.59 GHz), 4G LTE Band38 (2.59 GHz), LTE Band22/42 Band (3.50 GHz), WiMAX (3.5 GHz) and WLAN/HIPERLAN (5.4 GHz) applications. The proposed antenna comprises of a Flame Retardant 4 (FR4) dielectric substrate, which is constructed below the rectangular patch, a shorting plate which supports the radiating element and acts as a connector between the top patch and the ground plane. The ground plane is located under the substrate. The overall dimension of the proposed antenna is 27mm×30mm×3.8mm. Efforts has been made to keep the height (3.8mm)minimum possible so that, the antenna can be easily placed in the housing of handheld devices. The simulated results have shown a gain of 3 – 7 dB and radiation pattern gives almost omni – directional pattern at different targeted frequencies. The antenna layout in terms of antenna design, return loss, VSWR, gain and radiation pattern has been shown in this paper.
The wireless sensor networks need to be energy efficient in order to improve the lifetime of the sensor nodes involved in the network as well minimizing the redundant packets transmitted to the sink. To ensure such a situation, there is a need to ensure that only those sensors which are in proximity to the source of useful and desirable information (also termed as event of information) should be kept active in the sensor network. In this paper, the authors proposed a novel enhanced energy efficient leach algorithm based on energy and distance which can be used to ensure that useful packets get transmitted to the sink and simultaneously minimizing power consumption of network to ensure longer lifetime of the sensor nodes in the network.
The Orthogonal Frequency Division Multiplexing (OFDM) technique has become extremely well-liked technique in the last two decades. It is a bandwidth efficient signalling scheme for bandwidth digital communications. The present and upcoming generation of communication system depends mainly on such technique, because of its skill to combat multipath fading channels using the analogous concept of cyclic prefix (Guard Interval).With OFDM, it is possible to use a differential coding/differential detection either in the time or frequency domain bank on the condition of transmission channels with the adoption of DQPSK as a method of subcarrier modulation. It is crucial to understand the concepts behindOFDM. In whole architecture, the entire mathematicalmanoeuvring occur in transmitter and receiver block i.e. IFFT and FFT block correspondingly. The speed augmentation is the key contribution of the main processing blocks in OFDM system. In this paper, the authors will discuss the basics of OFDM system using 4 sub carriers over the AWGN channel providing DQPSK modulation. Simulation has been performed on the MATLAB so that, the graphical output will be optimized for interaction and some of its prospective and consequences have been studied.
This paper surveys, the widely adopted architectures of FFT/IFFT processor for MIMO OFDM systems. Emerging trends in mobile communication pose many architectural challenges to achieve high data throughput, less hardware complexity, low power consumption, high speed MIMO-OFDM systems. FFT/IFFT processor is one of the highest computational complexity modules in the system, to meet IEEE 802.11n requirements. The main concern of application of pipeline FFT/IFFT architectures is performance and power reduction. At the same time, application of memory based FFT/IFFT architectures are preferred when complexity is a main concern. High throughput rate can be achieved by the use of parallel data path schemes and higher radix and mixed radix FFT algorithms are used to reduce power consumptions and hardware complexity of the OFDM system. The unfolding mixed radix multipath delay feedback FFT architecture is used to deal efficiently with multiple data sequences. In Single-path delay feedback style, a reconfigurable complex multiplier and bit-parallel multipliers to achieve a ROM-less FFT/IFFT processor for low power consumption. This paper presents a comparative study on different efficient pipeline FFT/IFFT processor for OFDM applications in terms of scope of optimization and hardware complexity. Finally, this survey paper suggests open research challenges in this emerging area.
