Digital Signal Processing

T. Kalavathidevi ¹, K. V. Punitha ², C. Venkatesh ³

Affiliations
1 Electronic and Instrumentation Department, Kongu Engineering College, Tamil Nadu, IN
2 Electrical Engineering Department, Kongu Engineering College, Tamil Nadu, IN
3 EBET Group of Institutions, Tamil Nadu, IN

Abstract

Convolutional code is an essential Forward Error Correcting (FEC) code for many wireless communication systems. Viterbi decoder is an optimal algorithm for decoding a convolution code. The design of an efficient Integrated Circuit (IC) in terms of power, area and speed simultaneously has become a challenging problem. Power dissipation is recognized as a critical parameter in modern Very Large Scale Integrated circuit (VLSI) design field. The major source of power dissipation is dynamic power dissipation, which is due to the total switching activity. Viterbi decoder employed in digital wireless communication is complex and dissipates large power. The proposed method focuses on power reduction of Viterbi decoderat architecture level. The proposed method is to obtain high speed and low power Viterbi decoder using digit-serial architecture for various digit size and word length. In the digit-serial architecture N bits are processed per clock cycle and a word is processed per W/N clock cycles (W-word length, N-digit size). Digit-serial architecture achieves high speed and low power. Viterbi decoder is designed with code rate k/n=¼, constraint length K= 3, word length W=8, 32 and digit size N=2, 4. The functionality is simulated and verified using Modelsim and synthesized using Xilinx FPGA SPARTAN3.

Keywords

Digit-Serial Architecture, Digit-Size, Unfolding.

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K. S. Priyadharshini ¹, N. S. PremNaren ¹, K. Lokeshwaran ¹, C. Venkatesh ¹

Affiliations
1 Department of Electronics and Communication Engineering, Sri Eshwar College of Engineering, Coimbatore, TamilNadu, IN

Abstract

In the developing technology we are seeing many inventions in various fields including automatic machines, Internet Of Things and so on. There is a drastic increase of expectations in customer’s point of view. With the developing world, people always find the easy way to satisfy their needs and to use their time appropriately. In day-to-day life purchasing various products in malls or supermarkets require a trolley. Product procurement is a complex process. Each time customer has to push the trolley from rack to rack for collecting products and simultaneously customers are wasting their precious time and not willing to stand in long queue in order for the billing process. Our project is to scan the products by their own efforts which are going to be purchased. Each time product is added into trolley and cost of the each product is also calculated and displayed on the LCD. Mainly to find the location of the product Bluetooth mobile connectivity can be used. At the end, customer has to wait in queue for billing and payment. To overcome that we have developed a smart way for shopping. In this paper, we are presenting a smart shopping system using RFID and ARDUINO MEGA controller.

Keywords

RFID, Module, Arduinomega, Bluetooth, Smart Shopping.

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