Khurram Masood 200806100
description
Transcript of Khurram Masood 200806100
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Khurram MasoodKhurram Masood200806100200806100
PSK-Based Digital Transmission PSK-Based Digital Transmission SystemsSystems
Chapter 3 of Hiroshi Harada Book Chapter 3 of Hiroshi Harada Book
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• BPSK transmission scheme– Some instantaneous waveforms– BER performance
• Other PSK transmission schemes– QPSK– OQPSK– MSK– GMSK
• QAM for transmission– 16-QAM
OutlinesOutlines
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BPSK Transmission SchemeBPSK Transmission Scheme
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Simulated instantaneous waveformsSimulated instantaneous waveforms
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0 5 10-1
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0
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1BPSK tx data
Am
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1BPSK tx oversampled data
0 50 100-2
-1
0
1
2BPSK tx signal
0 20 40 60 80-2
-1
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2BPSK rx signal
Am
plitu
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Samples-1 0 1
-1
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0
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1BPSK phaser
I-Phase
Q-P
hase
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Theoretical and simulated Theoretical and simulated BER performanceBER performance
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0 5 10 15 20 25 30 35 4010
-4
10-3
10-2
10-1
100
Eb/N
0 [dB]
BE
RBPSK performance
BPSK AWGN theory
BPSK AWGNBPSK Rayleigh theory
BPSK Rayleigh
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QPSK transmissionQPSK transmission
• BPSK is simple in configuration• QPSK signal is generated by 2 BPSK signals• QPSK has higher frequency utilization efficiency
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Simulated instantaneous QPSK waveformsSimulated instantaneous QPSK waveforms
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0 10 200
0.5
1QPSK tx data
Am
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1QPSK tx oversampled
0 50 100-1
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1QPSK tx oversampled data[Q]
0 50 100-2
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2QPSK rx signal[I]
Am
plitu
de
0 50 100-2
-1
0
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2QPSK rx signal[Q]
-1 0 1
-1
0
1
QPSK phaser
I-data
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Theoretical and simulated QPSK Theoretical and simulated QPSK BER performanceBER performance
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0 5 10 15 20 25 30 35 4010
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10-3
10-2
10-1
100
Eb/N
0 [dB]
BE
RQPSK performance
QPSK AWGN theory
QPSK AWGNQPSK Rayleigh theory
QPSK Rayleigh
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OQPSK transmissionOQPSK transmission
• QPSK transmission may result in a phase change of 180⁰ between two symbols, causing the spectrum to spread
• OQPSK avoid origin crossings in the phase• Q-channel is half a symbol delayed from that of
I-channel signal
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Simulated instantaneous OQPSK waveformsSimulated instantaneous OQPSK waveforms
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0 10 200
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1OQPSK tx data
Am
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1OQPSK tx oversampled
0 50 100-1
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1OQPSK tx oversampled
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2OQPSK rx signal[I]
Am
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2OQPSK rx signal[Q]
-1 0 1
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1
OQPSK phaser
I-data Q-data
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Theoretical and simulated OQPSK Theoretical and simulated OQPSK BER performanceBER performance
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0 5 10 15 20 25 30 35 4010
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10-3
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10-1
100
Eb/N
0 [dB]
BE
ROQPSK performance
OQPSK AWGN theory
OQPSK AWGNOQPSK Rayleigh theory
OQPSK Rayleigh
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MSK transmissionMSK transmission
• Although OQPSK is good in reducing the big phase changes, the amplitude fluctuates
• MSK is used to stabilize the amplitude
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Simulated instantaneous MSK waveformsSimulated instantaneous MSK waveforms
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0 10 200
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1MSK tx data
Am
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0 50 100-1
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1MSK tx oversampled
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1MSK tx oversampled data[Q]
0 50 100-2
-1
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2MSK rx signal[I]
Am
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0 50 100-2
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2MSK rx signal[Q]
-1 0 1
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MSK phaser
I-data
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Theoretical and simulated MSK Theoretical and simulated MSK BER performanceBER performance
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Eb/N
0 [dB]
BE
RMSK performance
MSK AWGN theory
MSK AWGNMSK Rayleigh theory
MSK Rayleigh
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GMSK transmissionGMSK transmission
• In MSK maximum phase transition is limited to pi/2 in phase transition
• Fluctuation is not smooth• Used for GSM mobile phone system• Expanded version of MSK• Amplitude is constant like in MSK• Phase transition is smooth as well
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Simulated instantaneous GMSK waveformsSimulated instantaneous GMSK waveforms
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0 50 100-1
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1GMSK tx data
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GMSK tx data afterGaussian filtering
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Theoretical and simulated GMSK Theoretical and simulated GMSK BER performanceBER performance
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Eb/N
0 [dB]
BE
RGMSK performance
GMSK AWGN theory
GMSK AWGNGMSK Rayleigh theory
GMSK Rayleigh
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QAM transmissionQAM transmission
• Increased transmission rate with high frequency utilization efficiency
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Simulated instantaneous 16QAM waveformsSimulated instantaneous 16QAM waveforms
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116QAM tx data
Am
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de
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116QAM tx oversampled
0 50 100-1
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116QAM tx oversampled
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216QAM rx signal[I]
Am
plitu
de
0 50 100-2
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216QAM rx signal[Q]
-1 0 1
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16QAM phaser
I-data Q-data
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Theoretical and simulated 16QAM Theoretical and simulated 16QAM BER performanceBER performance
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Eb/N
0 [dB]
BE
R16QAM performance
16QAM AWGN theory
16QAM AWGN16QAM Rayleigh theory
16QAM Rayleigh