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
This paper provides details on how to enhance antenna performance and size reduction using Split Ring Resonator (SRR). The size and weight of various wireless electronic systems have been rapidly reduced due to the development of modern integrated circuit technology. Microstrip Patch Antennas (MPA) are increasing in popularity for the use in wireless applications due to their low-profile structure, light weight, low cost of production and they can also be easily integrated with microwave integrated circuits, but it also has some disadvantages. Lower gain and narrow bandwidth are the major drawbacks of a patch antenna. In this paper, the authors present a metamaterial concept for enhancing Microstrip Patch Antenna’s performance. Metamaterials are artificial materials characterized by same parameters generally not found in nature, but are engineered. Metamaterial structure consists of Split Ring Resonators (SRRs) to produce negative permeability and negative permittivity.
In recent years, Wireless Local Area Networks (WLANs) are widely deployed everywhere due to low-cost and easy installation. Selecting the best access point is the major research problem. The stations in the network should get associated with the suitable Access Points (AP) that result in higher throughput. In IEEE 802.11 wireless networks, the simple association strategy is to get associated to the AP with the strongest Received Signel Strength Indication (RSSI) value, which may cause load imbalance and eventually traffic overhead. Also, this strategy may not result in effective throughput as it does not consider the other parameters like channel conditions, traffic type, access point load. Several other strategies that use decision metrics like load information, position of AP, potential bandwidth, round trip time have been proposed after a long research work, but has failed in perfect association with an access point. Thus, access point selection is still a critical problem. A new metric or combination of metrics has to be derived that facilitates the effective selection of an AP, that maximizes the throughput. This paper presents the existing AP selection strategies in the context of WLAN. This paper also provides directions to design the metrics of AP selection method in a WLAN.
Wireless Sensor Networks (WSN) are battery-operated computing and sensing devices. The sensor nodes' lifetime is mainly influenced by its battery lifetime. Hence in a WSN MAC, energy conservation and self-configuration are primary goals, while per-node fairness and latency are less important. WSN devices include a low-rate, short-range wireless radio (10–100 kbps, <100 m). Radio communication is often the most power intensive operation and also the major contributor to the overall nodes' energy consumption, and hence the radio must incorporate energy-efficient sleep and wake-up modes. In this paper, three low power RF protocols such as SimpliciTI, TI-MAC, ZStack radio developed by Texas Instruments (TI) were implemented on CC2530 to form a simple data gathering star network. A contention-based MAC mechanism (CSMA/CA) is followed. The wireless protocols are tested for its operation and the performance measures such as the energy consumption of each node and the average energy of the received packets are measured for each protocol and compared.
This paper explains a detailed analysis on the design and implementation of 2x1 microstrip patch antenna array of given specifications using HFSS v15 software. The objective of this paper is to increase the antenna gain with reduced antenna size. The design has a dielectric material FR4 with dielectric substrate permittivity of 4.4, tangent loss of 0.002 and height of 1.6 mm. The microstrip patch antenna array is designed for WLAN and Ultra wide band Frequency applications, at an operating frequency of 3.6GHz and 6GHz with microstrip line feed and power dividers.
This paper presents a comparative study of HHT and DWT Based MIMO-OFDM for BPSK, QPSK and QAM modulation schemes in AWGN and Raleigh Fading Channel. Angular diversity is used in radars to mitigate the impairment caused by rapid fluctuations in Radar Cross Section (RCS) of the target. The antennas are placed in separate locations so that the target is seen from different angles. Such systems are called Statistical Multiple Input Multiple Output (MIMO) or MIMO radars with distributed antennas. This statistical MIMO radar exploits angular diversity to mitigate the impacts of RCS fluctuations. The channel capacity in AWGN channel is better when compared to the Rayleigh fading noise channel, since the SNR is high with low BER for any signal in any type of modulation technique. So that AWGN channel gives good results. Wavelet based OFDM has a lot of advantages compared to the FFT based OFDM. There is no need for cyclic prefix, flexibility and gives an optimal resolution. HHT based MIMO-OFDM gives better SNR and low BER compared to the FFT and DWT based MIMO-OFDM. In DWT MIMO OFDM, wavelets are applicable in almost all the areas of communications schemes with OFDM, which is a durable applicant for next peers of wireless schemes. Comparing different types of modulation schemes such as BPSK,QPSK and QAM, BPSK gives good results. So, finally HHT based MIMO OFDM in AWGN channel by using BPSK modulation technique gives better results compared to the DWT based MIMO OFDM.
The need for a simpler system that satisfies multiple requirements and standards has increased due to the rapid progress in the field of communication. The development of reconfigurable antennas has turned out to be a boon to such systems due to its dynamic characteristics, simple structure, light weight, better gain and radiation properties. The fast growing wireless technologies demands a highly complex system to satisfy the standards. This hardware complexity has posed a challenge to the research field in a way to make simple structures with effective characteristics. The researchers have presently succeeded in transforming these complex hardwares like filters at front end into simple antenna structures. This survey concentrates on various research works carried out in the field of frequency reconfiguration in microstrip antennas that has considerably reduced the complexity in structures and thereby the antenna size. Keywords: Frequency Reconfiguration, PIN Diodes, Varactor, Micro-Electro-Mechanical System(MEMS), Optical Antennas, Holographic Antennas, Ultra Wideband Antennas, Tunable Materials, Multipixel Antenna, Slot Antennas, Mechanically Reconfigurable Antennas.