ece4305_L08

# ece4305_L08 - PAM and PSK Modulation ECE4305...

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Unformatted text preview: PAM and PSK Modulation ECE4305: Software-Defined Radio Systems and Analysis Professor Alexander M. Wyglinski Department of Electrical and Computer Engineering Worcester Polytechnic Institute Lecture 8 Professor Alexander M. Wyglinski ECE4305: Software-Defined Radio Systems and Analysis PAM and PSK Modulation Modulation Concept Binary Pulsed Amplitude Modulation Binary Phase Shift Keying Modulation I The process of modulation can be viewed as a mapping of b bits into a symbol I The message m b is a b-vector of binary digits I For each m b (there are 2 b values of m b available), we need a unique signal s i ( t ), 1 ≤ i ≤ 2 b Source Source Encoding Channel Encoding Modulator 2 b Waveforms Equivalent Binary Source To Channel m b Figure: Modulation Process of Equivalent Binary Data. Professor Alexander M. Wyglinski ECE4305: Software-Defined Radio Systems and Analysis PAM and PSK Modulation Modulation Concept Binary Pulsed Amplitude Modulation Binary Phase Shift Keying Signal Constellation I Modulation rule: I “1” → s 1 ( t ) I “0” → s 2 ( t ) I The bit rate is defined as R b = 1 / T bps I The symbol energy is defined as E s = R ∞-∞ s 2 ( t ) dt [Joules] I Suppose we have the following modulation rule given the waveform: s ( t ) = A · [ u ( t )- u ( t- T )] (1) where u ( t ) is the unit step function, then: I “1” → s ( t ) I “0” → - s ( t ) Professor Alexander M. Wyglinski ECE4305: Software-Defined Radio Systems and Analysis PAM and PSK Modulation Modulation Concept Binary Pulsed Amplitude Modulation...
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## This note was uploaded on 01/13/2011 for the course ECE 4305 taught by Professor Wy during the Spring '10 term at WPI.

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ece4305_L08 - PAM and PSK Modulation ECE4305...

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