Tutorial Note 9 - ELEG 4503 Modern Communication Systems...

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ELEG 4503 Modern Communication Systems Tutorial 9 Nov. 4, 2016
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Binary phase-shift keying (BPSK) The general form for BPSK follows the equation: This yields two phases, 0 and π. In the specific form, binary data is often conveyed with the following signals: for binary “0” for binary “1” where fc is the frequency of the carrier-wave. Hence, the signal-space can be represented by the single basis function
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Quadrature phase-shift keying (QPSK) Conceptual transmitter structure for QPSK. The binary data stream is split into the in-phase and quadrature-phase components. These are then separately modulated onto two orthogonal basis functions. In this implementation, two sinusoids are used. Afterwards, the two signals are superimposed, and the resulting signal is the QPSK signal. Note the use of polar non-return-to-zero encoding. These encoders can be placed before for binary data source, but have been placed after to illustrate the conceptual difference between digital and analog signals involved with digital modulation.
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