11 PSK –phase of carrier signal is varied to represent binary 1 or 0 peak amplitude & freq. remain constant during each bit interval example: binary 1 = 0º phase, binary 0 = 180º (rad) phase PSK is equivalent to multiplying carrier signal by +1 when the information is 1, and by -1 when the information is 0 demodulation: demodulator must determine the phase of received sinusoid with respect to some reference phase advantage: PSK is less susceptible to errors than ASK, while it requires/occupies the same bandwidth as ASK more efficient use of bandwidth (higher data-rate) are possible, compared to FSK !!! disadvantage: more complex signal detection / recovery process, than in ASK and FSK 0binary ),tfAcos(21binary t),fAcos(2s(t)ccπππModulation of Digital Data: PSK 2-PSK, or Binary PSK, since only 2 different phases are used. +A -A 0binary t),fAcos(2-1binary t),fAcos(2s(t)ccππ
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