Informatics Publishing Limited

K. Senthamil Selvan ¹, S. Ravi ², B. LakshmiDhevi ³

Affiliations
1 St.Peter's University, Chennai-54, IN
2 Electronics and Communication Department, Dr. MGR Educational and Research Institute, University, Chennai, IN
3 MicroLogic Systems, Chennai, IN

Abstract

Software Defined Radios (SDR) is integrated with dynamically configurable software to enable Cognitive Radio (CR) design. Higher Channel densities management and continuous service provision are the performance measures for SDR. Incorporating adaptive modulation capability in sophisticated wireless communication techniques necessitates an Automatic Modulation Recognition for SDR. The abundant demodulation requisite for SDR is not catered sufficiently by available Automatic Modulation Recognition techniques. This paper deals with a novel method of automatic modulation identification for Software defined radio. The proposed technique uses a simple method of appending a unique pilot sequence to each modulated data for identification purpose. This work analyzes the performance of the identifier for typical modulations under noisy conditions and at different Signal to Noise Ratios (SNRs). A pre-processing module is also adapted in the modulation identification technique and performs rejection of noise, normalization, carrier frequency estimation and recovery of complex envelope.

Keywords

Software Defined Radio (SDR), Cognitive Radio (CR), Signal to Noise Ratio (SNR).

Full Text

     

P. Meena Sundari ¹, K. Senthamil Selvan ¹, T. Meenambal ²

Affiliations
1 Department of Chemistry, Jansons Institute of Technology, Coimbatore-641 659, Tamil Nadu, IN
2 Department of Civil Engineering, Government College of Technology, Coimbatore, Tamil Nadu, IN

Abstract

The main objective of the study is focused on water quality assessment of various surface water bodies in the Coimbatore city during winter (January 2011) and summer (April 2011). About 75% of the population in the area selected depends on the lake water for domestic purposes, agriculture and industrial purposes. Water samples were collected from four lakes in and around Coimbatore having the same source. The physical and chemical parameters like pH, turbidity, total dissolved solids, electrical conductivity, hardness, concentration of calcium, magnesium, iron, free ammonia, nitrate, nitrite, chloride, fluoride, sulphate and phosphate were analysed and compared with standard techniques. The data were analysed by comparing the values with BIS standards. The studies revealed that water in all the four surface water bodies are to be pre-treated suitably and could be employed for drinking, agriculture and industrial purposes.

Keywords

Water Quality, Lakes, Surface Water Bodies, Coimbatore City.

Full Text