i-manager's Journal on Communication Engineering and Systems (JCS)


Volume 3 Issue 3 May - July 2014

Research Paper

Frame Error Rate Performance for Adaptive M-QAM / S-OFDM Based Wireless Systems

A. Raja* , V. Thulasi Bai**
* Research Scholar, Sathyabama University, Chennai, India
** Professor and Dean, Department of ECE, Prathyusha Institute of Technology and Management, Chennai, India
Raja, A., and Thulasibai, V. (2014). Frame Error Rate Performance for Adaptive M-QAM / S-OFDM Based Wireless Systems. i-manager’s Journal on Communication Engineering and Systems, 3(3), 1-6. https://doi.org/10.26634/jcs.3.3.3176

Abstract

OFDM is an high data rate transmission modulation scheme which has complexity in wireless channels and can be merged with scalability for improving reliability of system called S-OFDM. In this paper, the authors proposed a performance analysis of Frame Error Rate (FER) for hybrid S-OFDM system in Rayleigh channel. The proposed scheme is shown to achieve lower Bit Error Rate (BER) and capturing more efficient receiver of multipath energy. Selecting a fraction of subcarriers with conjugate symmetric inputs to achieve the spreading. A channel SNR versus BER for both time and frequency for a 512-subcarrier OFDM with single-transmitter and single-receiver systems over an indoor wireless channel. The performance is evaluated for an S-OFDM system based on the IEEE 802.11. Simulation results shows, that the proposed scheme can achieve low BER and FER for a QAM- S-OFDM Symbols. The average channel SNR is 10 dB. The 16-QAM and 64-QAM are used in cable modem and many wireless technology applications.

Research Paper

Performance Analysis of Co-Operative Spectrum Sensing Using Rayleigh Fading Channel in Cognitive Radio

Yamini verma* , K. Neelam Dewangan**
* PG Scholar, Department of Electronics and Telecommunication, Chhatrapati Shivaji Institute of Technology, Durg, Chhattisgarh.
** Department of Electronics and Telecomm, Chhatrapati Shivaji Institute of Technology, Durg Chhattisgarh, India.
Verma, Y., and Dewangan, K. N. (2014). Performance Analysis of Co-Operative Spectrum Sensing Using Rayleigh Fading Channel in Cognitive Radio. i-manager’s Journal on Communication Engineering and Systems, 3(3), 7-13. https://doi.org/10.26634/jcs.3.3.3177

Abstract

One of the emerging techniques in wireless communication is cognitive radio which is used for the efficient utilization of radio frequency spectrum. One important requirement of cognitive radio is spectrum sensing. In this paper, various types of spectrum sensing techniques are mentioned. Cooperative sensing seemed to be the best method among all spectrum sensing techniques applied to overcome the problem of detection and false alarm associated by using single user. This paper studies the cooperative spectrum sensing scheme as means of optimizing the sensing performance in Rayleigh channels. Plot of SNR versus probability of detection for different values of false alarm is shown in this paper. All this output is achieved using MATLAB.

Research Paper

MSE and SER Compare For LS, MMSE and SMMSE for BCE Technique in OFDM

Divya Pandey* , K. Neelam Dewangan**
*PG Scholar, Department of Communication Engineering, Chhattisgarh Swami Vivekanand Technical University (CSVTU) Bhilai, Chhattisgarh.
**Department of Electronics and Telecomm, Chhatrapati Shivaji Institute of Technology, Durg Chhattisgarh, India.
Pandey, D., and Dewangan, K. N. (2014). MSE and SER Compare For LS, MMSE and SMMSE for BCE Technique in OFDM. i-manager’s Journal on Communication Engineering and Systems, 3(3), 14-21. https://doi.org/10.26634/jcs.3.3.3178

Abstract

Orthogonal frequency division multiplexing (OFDM) technique is the modulation technique provides less bandwidth usage and speed communication and hence preferred in many areas now a days. Channel estimation techniques are used to know the behavior of the channel and then that information is further used by receiver to eliminate the irregularities introduced by channel on transmitted signal. This paper includes Block type pilot assisted channel estimation technique (BCE).least square (LS), minimum mean square error (MMSE) and simplified minimum mean square error (SMMSE) techniques are used here. SMMSE technique is simplified MMSE technique which is similar to MMSE but with reduced complexity. The results are obtained by using MATLAB software. Performance evaluation is done by comparing values of mean squared error (MSE) and symbol error rate (SER) for different values of SNR. Performance of LS in comparison with other two techniques is less. MMSE and SMMSE have almost same performance, seen from results.

Research Paper

A Comparative Analysis of Reversible Data Hiding in H.264/AVC and H.265/HEVC Video Streams

kiruthika.T* , P.Sundaravadivel**
* PG Scholar in Embedded System Technologies, KSR College of Engineering,Tiruchencode, Namakkal, India.
** Assistant Professor, KSR College of Engineering,Tiruchencode, Namakkal, India.
Kiruthika,T., and Sundaravadivel, P. (2014). A Comparative Analysis of Reversible Data Hiding in H.264/AVC and H.265/HEVC Video Streams. i-manager’s Journal on Communication Engineering and Systems, 3(3), 22-27. https://doi.org/10.26634/jcs.3.3.3179

Abstract

In the course of the past decade, data hiding technologies had progressed from limited use to pervasive deployment. With the swift advancement of smart mobile devices, the need to protect valuable exclusive information has generated a surplus new methods and technologies. Using cryptographic techniques to encrypt data before transmission may overcome any type of security problems. But the camouflaged appearance of the encrypted data may arouse suspicion. A technique for hiding data with two level of security to embed data along with good perceptual quality and high payload capacity is proposed. This gives rise to improved version of dual steganography which will provide better security. An improved scheme of data hiding directly in the compressed version of H.264/AVC video stream and H.265/HEVC video stream is proposed, which includes the following three parts, i.e., data encryption, video compression, data embedding, and data extraction. A comparative analysis is made which proves that H.265 video stream provides a better compression and at the same time preserving the video quality. The scheme can ensure both the format compliance and the strict file size preservation.

Review Paper

Survey on Mutual Coupling Reduction Techniques for Imaging Radar Application

C. Mekala* , P. Saranya**, V. Sathya Narayanan***
*-** PG Scholar, Department of Communication Systems, Kongu Engineering College, Erode, Tamil Nadu.
*** Assistant Professor, Department of Electronics and Communication Engineering , Kongu Engineering College, Erode, Tamil Nadu.
Mekala, C., Saranya, P., Narayanan, V. S. (2014). Survey on Mutual Coupling Reduction Techniques for Imaging Radar Application. i-manager’s Journal on Communication Engineering and Systems, 3(3), 28-32. https://doi.org/10.26634/jcs.3.3.3181

Abstract

Mutual Coupling is the general problem occurring in arrays used in Imaging Radars. It is the electromagnetic phenomena, which is produced from absorption of radiating energy of one antenna by another. It significantly affects input impedance of the antenna, performance of array processing algorithm, magnitude and phase of the re-radiated waves, radiation pattern and also the received element voltage. Hence this paper provides the review of different methods to protect system from these effects by reducing mutual coupling. This survey on mutual coupling reduction techniques of antenna array in Imaging RADARs are discussed deeply. The discussion initiates with the effect of mutual coupling in antenna and covers the topics such as, parameters affected by coupling effect, coupling reduction techniques and also about the functionality of these techniques in performance improvement. Concludes with the selection of specific reduction scheme for suitable application. This survey also concentrates on comparison of coupling effect reduction through arrangement of array element in square and triangular lattice of array.