King Fahd University of Petroleum & Minerals Electrical Engineering Department

EE 578 Simulation of Wireless Systems

PSK Based Digital Transmission Schemes

Assignment # 3

Ali Al-SaihatiID# 200350130

OUTLINE Introduction.

BPSK.

QPSK.

OQPSK.

MSK.

GMSK

QAM

IntroductionSignal Waveform:

S(t)= A cos {2πfct + Ѳ(t)}

QPSK has better transmission rate than BPSK .

QPSK doesn’t achieve high BW efficiency.

BPSKInput data of 0 & 1 are converted to phases 0

& π.

Waveform signal:

S(t)= A cos {2πfct + π dk}

dk is the information data sequence.

Nyquist Filter

Channel CompensationChannel compensation at transmitter and

receiver.

Results

BER Performance

QPSKGenerated by two BPSK signals.

Uses two orthogonal carrier signals (cos 2πfct, sin 2πfct) .

Signal:

dk is converted into parallel data.

Transmitter & Receiver

Results

OQPSKHas 4 states for I & Q: (1,1), (1,-1), (-1,1), (-

1,-1).

Same QPSK configuration but with different mapping circuit.

Signal:

BER same as QPSK.

Mapping

Results

MSKAmplitude is weighted to eliminate fluctuation in amplitude.

Weighting function for I is cos (πt/ 2Tb) and Q is sin (πt/ 2Tb).

Singnal:

BER same as QPSK.

Mapping

Results

GMSKUsed in GSM mobile phone system.

Amplitude is constant.

Keeps the transition phase smooth at kTb.

Mapping

Results

QAMSignal:

BER M=16:

Results

Thank You