A novel sample based quadrature phase shift keying demodulator

Research output: Contribution to journalArticle

Abstract

This paper presents a new practical QPSK receiver that uses digitized samples of incoming QPSK analog signal to determine the phase of the QPSK symbol. The proposed technique is more robust to phase noise and consumes up to 89.6% less power for signal detection in demodulation operation. On the contrary, the conventional QPSK demodulation process where it uses coherent detection technique requires the exact incoming signal frequency; thus, any variation in the frequency of the local oscillator or incoming signal will cause phase noise. A software simulation of the proposed design was successfully carried out using MATLAB Simulink software platform. In the conventional system, at least 10 dB signal to noise ratio (SNR) is required to achieve the bit error rate (BER) of 10-6, whereas, in the proposed technique, the same BER value can be achieved with only 5 dB SNR. Since some of the power consuming elements such as voltage control oscillator (VCO), mixer, and low pass filter (LPF) are no longer needed, the proposed QPSK demodulator will consume almost 68.8% to 99.6% less operational power compared to conventional QPSK demodulator.

Original languageEnglish
Article number107831
JournalScientific World Journal
Volume2014
DOIs
Publication statusPublished - 2014

Fingerprint

Demodulators
Quadrature phase shift keying
Signal-To-Noise Ratio
Software
signal-to-noise ratio
Phase noise
Demodulation
software
Bit error rate
Signal to noise ratio
Mixer circuits
Signal detection
Low pass filters
filter
Voltage control
MATLAB
simulation
rate
detection

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Environmental Science(all)
  • Medicine(all)

Cite this

A novel sample based quadrature phase shift keying demodulator. / Mohamed Moubark, Asraf; Md Ali, Sawal Hamid.

In: Scientific World Journal, Vol. 2014, 107831, 2014.

Research output: Contribution to journalArticle

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