i-manager's Journal on Wireless Communication Networks (JWCN)


Volume 1 Issue 3 October - December 2012

Research Paper

PAPR Reduction of STBC MIMO- OFDM Systems Using Adaptive Active Constellation Extension

K Srinivasa Rao* , B. Prabhakara Rao**
* Electronics and Communication Engineering, G.V.P College of Engineering for Women, Visakhapatnam, A.P, India.
** Electronics and Communication Engineering, J.N.T University, Kakinada, A.P, India.
Rao, K.S., and Prabakararao, B. (2012). PAPR Reduction of STBC MIMO-OFDM Systems Using Adaptive Active Constellation Extension. i-manager’s Journal on Wireless Communication Networks, 1(3), 1-7. https://doi.org/10.26634/jwcn.1.3.2048

Abstract

In this paper Adaptive Active Constellation (A-ACE) is analyzed for Peak to Average Power Ratio (PAPR) reduction of OFDM Systems with spectral diversity of Space time Block Coding (STBC). To support large system capacity with robustness to multipath fading, OFDM and MIMO have been combined as MIMO-OFDM. To overcome the disadvantage of low clipping ratio problem in clipping based-Active Constellation Extension (CB-ACE) technique for PAPR reduction in OFDM systems, we analyzed ACE algorithm with adaptive clipping control to STBC MIMO-OFDM systems. Simulation results demonstrate that the algorithm can reach the minimum PAPR for severely low clipping ratios, and the performance of this algorithm is superior to the performance of the ACE method in the single antenna OFDM system.

Research Paper

OVSF Code Assignment for Wideband Code Division Multiple Access (WCDMA) in FPGA

P. Kavipriya* , C. Gomathi**
* Research Scholar, Sathyabama University, Chennai, India.
** Professor & Head, SRM University, Chennai, India.
Kavipriya, P., and Gomathy, C. (2012). OVSF Code Assignment For Wideband Code Division Multiple Access (WCDMA) in FPGA, i-manager’s Journal on Wireless Communication Networks. 1(3), 8-13. https://doi.org/10.26634/jwcn.1.3.2049

Abstract

This paper describes the wideband Direct Sequence Code Division Multiple Access (WCDMA) wireless transmitter design using Field Programmable Gate Array (FPGA), which has been adopted in many wireless access technologies. Four separate blocks have been designed using digital approach to form the transmitter circuit diagram using the oscillator, the OVSF-code generator, the Parity Check, and the BPSK modulator. The WCDMA air interface was initially designed to support a wide variety of services with different QoS requirements having a maximum bit rate of 2 Mb/s. In order to satisfy the future service and application needs several technical enhancements are being studied and standardized for WCDMA in 3GPP. Wideband code division multiple access (WCDMA) uses orthogonal variable spreading factor (OVSF) codes to support diversified data transmission rates and quality of service (QoS). In this paper, we propose a improved OVSF code assignment to support QoS for WCDMA.The Synopsys software has been used for the design synthesis and simulation; the Very High Speed Integrated Circuit Hardware Description Language (VHDL) program was used for coding and FPGA for compiling and downloading the simulation. The WCDMA wireless transmitter was designed to transmit with data rates up to 2 Mbps. The transmitted signals were carried with a 40 MHz carrier frequency.

Research Paper

Tomorrow’s EARTHNET – Connecting Earth to Mars using WRP (Wireless Routing Protocol).

Dhivya*
Karpaga Vinayaga College of Engineering and Technology, Tamil Nadu, India.
Dhivya, S.B. (2012). Tomorrow's Earthnet – Connecting Earth to Mars using WRP, i-manager’s Journal on Wireless Communication Networks. 1(3), 14-19. https://doi.org/10.26634/jwcn.1.3.2050

Abstract

The Interplanetary Internet is a next-generation space network architecture proposed by NASA which aims to establish a communication infrastructure in deep space and connect planets and satellites etc. The vision of future space exploration includes missions to deep space that require communication among planets, moons, satellites, asteroids, robotic spacecrafts, and crewed vehicles. These missions produce significant amount of scientific data to be delivered to the Earth. IPN Internet is an often disconnected and store-and-forward ‘network of Internet’ based on a wireless backbone with huge delays and error prone links. The first application of IPN Internet may be the “Mars network” which is now being developed to facilitate the exploration of Mars. In this paper, with concern to establishing the paths among the nodes, rovers and in order to transfer data with an efficient and scalable manner Wireless Routing Protocol (WRP) which uses the Bellman Ford algorithm to calculate paths is implemented with simulation results. Because of the mobile nature of the nodes this protocol introduces mechanisms which reduce route loops and ensure reliable message exchange.

Research Paper

Application of Wireless Sensor Network through Efficient and Secure Routing Protocol

S. Ganesh* , R. Amutha**
* Research Scholar, Sathyabama University, Chennai, India.
** Professor, Faculty of Electronics & Communication Engineering, SSN College of Engineering, Chennai, India.
Ganesh, S., and Amutha, R. (2012). Application Of Wireless Sensor Network Through Efficient And Secure Routing Protocol, i-manager’s Journal on Wireless Communication Networks. 1(3), 20-34. https://doi.org/10.26634/jwcn.1.3.2051

Abstract

A sensor network is an infrastructure comprised   of sensing (measuring), computing, and communication elements that gives an administrator the ability to instrument, observe, and react to events and phenomena in a specified environment. Patients who have survived cardiac attack or other physiological problems are at a higher risk of sudden cardiac death. Many of these patients are living at home without any kind of cardiac monitoring systems. By using a wearable monitoring system for detection of ECG systole,Diastole,Flux,Bodyemperature,Weight,Accelerometer Latitude and Longitudinal location, it is possible to alert healthcare professional to the patient’s condition so that the necessary action for an emergency rescue can occur. A special purpose sensor network here, designed to operate autonomously to connect varies medical sensors placed on the human body. In this system, we effectively  monitors the patients physiological status  such as ECG, Body temperature, systole, diastole, Heartbeat, flex, Accelerometer and successfully processed in the transmitter kit, which is attached in the patients body. Effectively transmits the data from the transmitter kit through a GPRS to the receiver which is located in the hospital server.

Research Paper

Energy Conservation In Wireless Sensor Networks Using Node Reputation Ranking

P. Jai Balaji* , S. Anandamurugan**
* PG student, Computer Science Engineering, Kongu Engineering College, Erode, India.
** Assistant Professor, Information Technology, Kongu Engineering College, Erode, India
Balaji, P.J., and Anandamurugan, S. (2012). Energy Conservation in Wireless Sensor Networks Using Node Reputation Ranking, i-manager’s Journal on Wireless Communication Networks, 1(3), 35-40. https://doi.org/10.26634/jwcn.1.3.2052

Abstract

Heavy traffic load at certain locations in Wireless sensor networks generates hot spots which leads the nodes to deplete energy resources quickly and degrade network services. The Cluster head (CH) have the additional responsibility in collecting and transmitting information. As distance to sink decreases, relay load on CH gets increased.  In order to balance traffic load and energy consumption, CH role is rotated across all nodes. Based on the hop distance to data sink, equalization of node lifetime and reduced energy consumption levels, suitable cluster size is determined by the existing distributed energy efficient clustering algorithm. Here, end to end energy consumption is calculated by the energy efficient multi-hop data collection protocol. Mobile sensor node cannot be arbitrarily chosen as CH and fluctuation in hot spot region is high and mainly sensor node’s unwillingness to serve the network as the CH are the drawbacks. The proposed scheme Mobility Aware cluster head selection calculates node reputation to have better cluster head in the hot spots of WSN. Based on node reputation and mobility rate, node ranking is calculated and the clustering efficiency can be measured  in terms of cooperativeness and mobility of sensor nodes. However, certain sensor nodes have high mobility and certain nodes will be unwilling to serve the network. The proposal presents Mobility Aware Reputation Node Ranking (MARNR) technique to improve the efficiency of clustering at hot spot regions. MARNR identifies the senor nodes mobility rate.