FPGA Implementation of /4 -QPSK ABSTRACTHere, we are presenting the FPGA based simulation of /4- QPSK modulator and demodulator. /4- QPSK is widely used modulation scheme in satellite radio applications. Complete modulator and demodulator units will be modeled using VHDL and their functionality are verified using ModelSim simulation tools. The code was synthesized on the Spartan-3E FPGA .Simulation waveforms and a brief synthesis report is also presented in this paper.

Designed modulators using VHSIC (Very High Speed Integrated Circuit) Hardware Description Language (VHDL) was realized on high speed FPGA (Field Program Programmable Gate Array). Because for used modulation technique data rate transfer is fairly important in wireless communication systems

Contact: Vivekanand M Bonal 8884956349 Key words: /4- QPSK, VHDL, FPGA, Modulator, Demodulator

1. Aim of the Project The aim of the project is to design and implement an FPGA based simulation of /4- QPSK modulator and demodulator. /4- QPSK is widely used modulation scheme in satellite radio applications.

2. Design Overview

Implementation of Pi/4 QPSK Modulator

Implementation of /4- QPSK Demodulator3. Design Blocks

1. 2. Pi/4 QPSK Modulator

Clock distributor, Reset generator, Phase accumulator, True phase translator COS carrier LUT.

3. Pi/4 QPSK deModulator Symbol Timing recovery circuit, Phase accumulator, Digital multiplier, Integrate and dump circuit, Base band differential Detector, Decision device Multiplexer.4. 5. Requirement analysis ModelSim for Simulation. Quartrus II 10.1 for FPGA Implementation. VHDL Coding

5. Applications Satellite subsystems Television Broad Casting Radio Communication

*****************************