Implementation of BPSK, DSSS and DQPSK Modulators and Their Performance Comparison in VHDL
Prof. P. Subba Rao1, N. Durga Naga Lakshmi2, V. Geetanjali3

1Prof. P. Subba Rao, Department of ECE, SRKR Engineering College, Bhimavaram (Andhra Pradesh), India.
2N.Durga Naga Lakshmi, Department of ECE, SRKR Engineering College, Bhimavaram (Andhra Pradesh), India.
3V.Geetanjali, Department of ECE, SRKR Engineering College, Bhimavaram (Andhra Pradesh), India.
Manuscript received on 07 April 2019 | Revised Manuscript received on 20 April 2019 | Manuscript published on 30 April 2019 | PP: 1713-1716 | Volume-8 Issue-6, April 2019 | Retrieval Number: F4041048619/19©BEIESP
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Abstract: Implementation of digital modulators is playing an important role in various fields in recent years. The design of BPSK modulator is presented using Direct Digital Synthesizer (DDS) with the aid of LUTs and Accumulators. For security enhancement and capacity improvement, Direct Sequence Spread Spectrum (DSSS) modulator is designed using a PN sequence generator and a simple BPSK Modulator. To overcome the problem of generating the coherent carrier at receiving end, the digital information is encoded as the phase change instead of absolute phase using a Differential QPSK Modulator. The performance of these three modulation techniques is compared in terms of area and power. The entire design is done in XILINX ISE 14.5 software using VHDL. The device used is VIRTEX4 starter kit.
Keyword: Binary Phase Shift Keying, Direct Digital Synthesizer (DDS), DQPSK, DSSS, PN Sequence Generator, VHDL.
Scope of the Article: Performance Evaluation of Networks