Informatics Publishing Limited

P. N. Kota ¹, A. N. Gaikwad ², B. P. Patil ³

Affiliations
1 Sinhagad Institute of Technology, SP Pune University, Pune, IN
2 DCOER, SP Pune University, Pune, IN
3 Army Institute of Tech, SP Pune University, Pune, IN

Abstract

In this paper, a Non uniform DFT-spread constellation reforming method is proposed for reduction of peak power to average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) system. The key idea of the proposed method is to generate virtually 3-PSK (V3PSK) by reforming quadrature phase shift keying modulation (QPSK). In this reforming modulation constellation point arranged in such way that one of the symbol is comes at origin to get benefit of DFT spreading. When the virtual QPSK constellation is employed with the conventional selected mapping (C-SLM) methods in OFDM systems, called as the V-SLM methods in this paper, Theoretical analysis and simulation results show that the virtual QPSK could reduce PAPR and also it is less complex than the conventional SLM methods.

Keywords

Orthogonal Frequency Division Multiplexing, Extended QPSK, Peak to Average Power Ratio, Quadrature Phase Shift Keying, Selected Mapping, Virtually 3-PSK, Virtual Selected Mapping.

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P. N. Kota ¹, A. N. Gaikwad ², B. P. Patil ³

Affiliations
1 Department of Electronics and Telecommunication Engineering, Sinhgad Institute of Technology, IN
2 Department of Electronics and Telecommunication Engineering, Zeal College of Engineering and Research, IN
3 Department of Electronics and Telecommunication Engineering, Army Institute of Technology, IN

Abstract

Space frequency block code orthogonal frequency division multiplexing (SFBC-OFDM) systems has inherit drawbacks of high peak-to average power ratio (PAPR) signals, and constellation shaping with trellis is a promising approach for reducing both peak power and bit error rate of SFBC-OFDM signals. In practice, reliability will improve in SFBC-OFDM by employing coded modulation. In this work, it has been proposed two trellis coded mapping method for SFBC MIMO OFDM system for achieving good error performance as well as reduced PAPR and compared with SLM technique. Based on the simulation results the proposed methods has the capability to provide reduced PAPR and bit error rate in SFBC MIMO-OFDM systems without side information.

Keywords

Orthogonal Frequency Division Multiplexing (OFDM), Peak-to-Average Power Ratio (PAPR) Reduction, Space Frequency Block Code (SFBC), Trellis Shaping (TS), Zero Force Detection (ZF).

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Rahul Desai ¹, B. P. Patil ²

Affiliations
1 Sinhgad College of Engineering, Information Tech. Department, Army Institute of Technology, Savitribai Phule Pune University, IN
2 E&TC Department, Army Institute of Technology, Savitribai Phule Pune University, IN

Abstract

In this paper, prioritized sweeping confidence based dual reinforcement learning based adaptive routing is studied. Routing is an emerging research area in wireless networks and needs more research due to emerging technologies such as wireless sensor network, ad hoc networks and network on chip. In addition, mobile ad hoc network suffers from various network issues such as dynamicity, mobility, data packets delay, high dropping ratio, large routing overhead, less throughput and so on. Conventional routing protocols based on distance vector or link state routing is not much suitable for mobile ad hoc network. All existing conventional routing protocols are based on shortest path routing, where the route having minimum number of hops is selected. Shortest path routing is non-adaptive routing algorithm that does not take care of traffic present on some popular routes of the network. In high traffic networks, route selection decision must be taken in real time and packets must be diverted on some alternate routes. In Prioritized sweeping method, optimization is carried out over confidence based dual reinforcement routing on mobile ad hoc network and path is selected based on the actual traffic present on the network at real time. Thus they guarantee the least delivery time to reach the packets to the destination. Analysis is done on 50 nodes MANET with random mobility and 50 nodes fixed grid network. Throughput is used to judge the performance of network. Analysis is done by varying the interval between the successive packets.

Keywords

DSDV, AODV, DSR, Q Routing, CBQ Routing, DRQ Routing, CDRQ Routing.

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V. B. Malode ¹, B. P. Patil ²

Affiliations
1 Department of Electronics, J.N.E.C., N-6, CIDCO, Aurangabad, IN
2 Department of Electronics, M.A.E., Alandi, Pune, IN

Abstract

Multi-carrier modulation is an attractive technique for fourth generation wireless communication. Orthogonal Frequency Division Multiplexing (OFDM) is multi-carrier transmission scheme. Its high Peak to Average Power Ratio (PAPR) of the transmitted signal is a major drawback. In this paper, we propose to reduce PAPR by probabilistic method Modified selective mapping technique using the standard arrays of linear block codes. We choose lowest PAPR in each coset of a linear block codes as its coset leader from several transmitted signal. Simulation results show that PAPR results are better as compared to earlier work done by Yang Jie,Chen Lei et al. The paper also compared PAPR QPSK/DQPSK-OFDM with and without SLM.

Keywords

OFDM, SLM, PAPR, LBC, QPSK, DQPSK.

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S. S. Sonavane ¹, B. P. Patil ¹, V. Kumar ²

Affiliations
1 Department of Electronics Engineering, Maharashtra Academy of Engineering, Alandi (Pune), Maharashtra, IN
2 Department of Electronics & Instrumentation Engineering, Indian School of Mines University, Dhanbad-826004, Jharkhand, IN

Abstract

In this paper, a new design of wireless sensor network (WSN) node is discussed which is based on components with ultra low power. We have developed a Low cost and low power WSN Node using MSP430 and nRF24L01. The architectural circuit details are presented. This architecture fulfils the requirements like low cost, low power, compact size and self-organization. Various tests are carried out to test the performance of the nRF24L01 module. The packet loss, free Space loss (FSL) and battery lifetime calculations are described. These test results will help the researchers to build new applications using above node and to work efficiently with nRF24L01.

Keywords

Wireless Sensor Networks, MSP430, nRF24L01, Free Space Loss, Battery Lifetime, Packet Loss.

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K. S. Surekha ¹, B. P. Patil ²

Affiliations
1 Sinhgad College of Engineering Pune, Army Institute of Technology, Pune – 411015, Maharashtra, IN
2 Army Institute of Technology, Pune – 411015, Maharashtra, IN

Abstract

Objectives: In this paper we present, compression of QRS complex of ECG signal by hybrid technique. The methodology employs both cascade and parallel combination of DCT and DWT. Methods/Statistical Analysis: QRS complex is an important part of ECG signal used by doctors for diagnosis purpose. The transmission of QRS complex requires less memory and complexity as compared to the complete ECG signal.The methodology employs both cascade and parallel combination of DCT and DWT. The performance measures such as PRD (Percent Root mean square Difference) and CR (Compression Ratio) are used to validate the results. Findings: MIT-BIH ECG database is used for the study. The threshold based technique is implemented on both cascade and parallel system. The cascade technique shows improved CR and proved to be better than the parallel sytem in terms of storage and transmission. The lower value of PRD also demonstrates the improved quality of the reconstructed signal in the cascade and parallel system. Application/Improvements: The cascade system with a high CR requires less memory. Both the cascde and parallel system show good reconstruction quality with the low PRD.

Keywords

Cascade, ECG, Parallel, QRS complex

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