K. Ramasamy

Wireless Power Transmission - A Next Generation Power Transmission System

paper, we present the concept of transmitting power without using wires i.e., transmitting power as microwaves from one place to another is in order to reduce the transmission and distribution losses. This concept is known as Microwave Power transmission (MPT). We also discussed the technological developments in Wireless Power Transmission (WPT). The advantages, disadvantages, biological impacts and applications of WPT are also presented.

A Sierpinski Fractal Based Microstrip Patch Antenna for Wireless Power Transmission System

In this paper a Microsrtip patch fractal antenna in a Sierpinski carpet is proposed for the Wireless Power Transmission (WPT) System. The design and simulation results of 2.45 GHz Microstrip patch fractal antenna are presented. The antenna is designed based on the transmission line model with the input impedance of 50Ω. The simulation results are well matched with the calculated values and show that the size of the antenna can be reduced to 31.26% from the conventional patch antenna. The simulation of the proposed antenna is done by Zeland Inc’s IE3D software. The full text of the article is not available in the cache. Kindly refer the IJCA digital library at www.ijcaonline.org for the complete article. In case, you face problems while downloading the full-text, please send a mail to editor at editor@ijcaonline.org

Performance comparison of convolutional and block turbo codes

Turbo code is recommended as a channel coding scheme, which has been shown to be capable of performing close to the Shannon Limit. In this paper, we compare the performance of both convolutional and block turbo codes over AWGN and Rayleigh fading channels. It is observed that the performance of convolutional turbo code is slightly better in the water fall region and the coding gain ranges from 0.5 to 0.7dB at BER of 10-4 depending on the channel conditions. But below BER of 10-4 or 10-5 an error floor occurs in the case of convolutional turbo code. Block turbo codes tend to outperform convolutional turbo codes for low BER.

Performance evaluation of proposed asymmetric turbo code in WCDMA HSDPA system

This paper considers the application of the proposed asymmetric turbo code system [4,5] in MIMO High Speed Downlink Packet Access (HSDPA) service of WCDMA. In typical turbo code system [3], an encoder with code rate 1/3 is used together with bit repetition to achieve the code rate 1/4. However, this approach suffers from weak Bit Error Rate (BER) performance compared to the more complex encoding system which implements puncturing scheme in order to achieve code rate 1/4. In this paper, we used the proposed asymmetric turbo code system to mitigate the weak BER performance introduced in bit repetition scheme. At the same time, we found that the proposed asymmetric turbo code system could achieve high throughput compared to typical turbo code system used in HSDPA system. The performance of typical turbo code and proposed asymmetric turbo code using bit repetition and puncturing schemes is studied in MIMO HSDPA system using MATLAB simulation and compared. From the simulation results, it is observed that the proposed asymmetric turbo code system performs better and it provides coding gain of 0.2dB to 0.3dB and the total throughput is also increased up to 10% compared to typical turbo code system in MIMO HSDPA.

A 2.45GHz Sierpinski Carpet edge-fed microstrip patch fractal antenna for WPT rectenna

A Sierpinski carpet edge-fed microstrip patch antenna is proposed for size reduction of rectenna of Wireless Power Transmission (WPT) System. The conventional patch antenna is designed based on transmission line model with the characteristics impedance of 50O. The fractal geometry for the conventional antenna is generated up to second iteration and simulated. The results shows that the maximum of 27.68 % size reduction can be achieved by the Sierpinski Carpet microstrip patch antenna of the second iteration order, without affecting the other performances such as return loss and radiation pattern.

ToF measurement based novel top edge detection algorithm for a smart security system

This paper describes a security system capable of identifying the presence of moving object using ultrasonic sensor, without human intervention. A constrained optimization of the Time of Flight (ToF) technique is employed to obtain the reflected pulses that are easily detectable by means of threshold comparator. Converting the ultrasonic sensors output into predefined value based on ToF and our novel Top Edge Detection (TED) algorithm, the system is able to fix a position from where CMOS image capturing sensor can capture an instance of image of the object.