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Khurram Masood Khurram Masood 200806100 200806100 PSK-Based Digital PSK-Based Digital Transmission Systems Transmission Systems Chapter 3 of Hiroshi Harada Chapter 3 of Hiroshi Harada Book Book

Khurram Masood 200806100

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Khurram Masood 200806100. PSK-Based Digital Transmission Systems Chapter 3 of Hiroshi Harada Book. Outlines. BPSK transmission scheme Some instantaneous waveforms BER performance Other PSK transmission schemes QPSK OQPSK MSK GMSK QAM for transmission 16-QAM. BPSK Transmission Scheme. - PowerPoint PPT Presentation

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Page 1: Khurram Masood 200806100

Khurram MasoodKhurram Masood200806100200806100

PSK-Based Digital Transmission PSK-Based Digital Transmission SystemsSystems

Chapter 3 of Hiroshi Harada Book Chapter 3 of Hiroshi Harada Book

Page 2: Khurram Masood 200806100

• BPSK transmission scheme– Some instantaneous waveforms– BER performance

• Other PSK transmission schemes– QPSK– OQPSK– MSK– GMSK

• QAM for transmission– 16-QAM

OutlinesOutlines

Page 3: Khurram Masood 200806100

BPSK Transmission SchemeBPSK Transmission Scheme

04/22/23 3

Page 4: Khurram Masood 200806100

Simulated instantaneous waveformsSimulated instantaneous waveforms

04/22/23 4

0 5 10-1

-0.5

0

0.5

1BPSK tx data

Am

plitu

de

0 50 100-1

-0.5

0

0.5

1BPSK tx oversampled data

0 50 100-2

-1

0

1

2BPSK tx signal

0 20 40 60 80-2

-1

0

1

2BPSK rx signal

Am

plitu

de

Samples-1 0 1

-1

-0.5

0

0.5

1BPSK phaser

I-Phase

Q-P

hase

Page 5: Khurram Masood 200806100

Theoretical and simulated Theoretical and simulated BER performanceBER performance

04/22/23 5

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

Page 6: Khurram Masood 200806100

QPSK transmissionQPSK transmission

• BPSK is simple in configuration• QPSK signal is generated by 2 BPSK signals• QPSK has higher frequency utilization efficiency

04/22/23 6

Page 7: Khurram Masood 200806100

Simulated instantaneous QPSK waveformsSimulated instantaneous QPSK waveforms

04/22/23 7

0 10 200

0.5

1QPSK tx data

Am

plitu

de

0 50 100-1

-0.5

0

0.5

1QPSK tx oversampled

0 50 100-1

-0.5

0

0.5

1QPSK tx oversampled data[Q]

0 50 100-2

-1

0

1

2QPSK rx signal[I]

Am

plitu

de

0 50 100-2

-1

0

1

2QPSK rx signal[Q]

-1 0 1

-1

0

1

QPSK phaser

I-data

Page 8: Khurram Masood 200806100

Theoretical and simulated QPSK Theoretical and simulated QPSK BER performanceBER performance

04/22/23 8

0 5 10 15 20 25 30 35 4010

-4

10-3

10-2

10-1

100

Eb/N

0 [dB]

BE

RQPSK performance

QPSK AWGN theory

QPSK AWGNQPSK Rayleigh theory

QPSK Rayleigh

Page 9: Khurram Masood 200806100

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

04/22/23 9

Page 10: Khurram Masood 200806100

Simulated instantaneous OQPSK waveformsSimulated instantaneous OQPSK waveforms

04/22/23 10

0 10 200

0.5

1OQPSK tx data

Am

plitu

de

0 50 100-1

-0.5

0

0.5

1OQPSK tx oversampled

0 50 100-1

-0.5

0

0.5

1OQPSK tx oversampled

0 50 100-2

-1

0

1

2OQPSK rx signal[I]

Am

plitu

de

0 50 100-2

-1

0

1

2OQPSK rx signal[Q]

-1 0 1

-1

0

1

OQPSK phaser

I-data Q-data

Page 11: Khurram Masood 200806100

Theoretical and simulated OQPSK Theoretical and simulated OQPSK BER performanceBER performance

04/22/23 11

0 5 10 15 20 25 30 35 4010

-4

10-3

10-2

10-1

100

Eb/N

0 [dB]

BE

ROQPSK performance

OQPSK AWGN theory

OQPSK AWGNOQPSK Rayleigh theory

OQPSK Rayleigh

Page 12: Khurram Masood 200806100

MSK transmissionMSK transmission

• Although OQPSK is good in reducing the big phase changes, the amplitude fluctuates

• MSK is used to stabilize the amplitude

04/22/23 12

Page 13: Khurram Masood 200806100

Simulated instantaneous MSK waveformsSimulated instantaneous MSK waveforms

04/22/23 13

0 10 200

0.5

1MSK tx data

Am

plitu

de

0 50 100-1

-0.5

0

0.5

1MSK tx oversampled

0 50 100-1

-0.5

0

0.5

1MSK tx oversampled data[Q]

0 50 100-2

-1

0

1

2MSK rx signal[I]

Am

plitu

de

0 50 100-2

-1

0

1

2MSK rx signal[Q]

-1 0 1

-1

0

1

MSK phaser

I-data

Page 14: Khurram Masood 200806100

Theoretical and simulated MSK Theoretical and simulated MSK BER performanceBER performance

04/22/23 14

0 5 10 15 20 25 30 35 4010

-4

10-3

10-2

10-1

100

Eb/N

0 [dB]

BE

RMSK performance

MSK AWGN theory

MSK AWGNMSK Rayleigh theory

MSK Rayleigh

Page 15: Khurram Masood 200806100

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

04/22/23 15

Page 16: Khurram Masood 200806100

Simulated instantaneous GMSK waveformsSimulated instantaneous GMSK waveforms

04/22/23 16

0 50 100-1

-0.5

0

0.5

1GMSK tx data

Am

plitu

de

0 50 100-1

-0.5

0

0.5

1

GMSK tx data afterGaussian filtering

0 50 100-12

-10

-8

-6

-4GMSK phase variation

0 50 100-1

-0.5

0

0.5

1GMSK tx signal

Am

plitu

de

-10 0 10-10

-5

0

5

10GMSK phaser

Page 17: Khurram Masood 200806100

Theoretical and simulated GMSK Theoretical and simulated GMSK BER performanceBER performance

04/22/23 17

0 5 10 15 20 25 30 35 4010

-4

10-3

10-2

10-1

100

Eb/N

0 [dB]

BE

RGMSK performance

GMSK AWGN theory

GMSK AWGNGMSK Rayleigh theory

GMSK Rayleigh

Page 18: Khurram Masood 200806100

QAM transmissionQAM transmission

• Increased transmission rate with high frequency utilization efficiency

04/22/23 18

Page 19: Khurram Masood 200806100

Simulated instantaneous 16QAM waveformsSimulated instantaneous 16QAM waveforms

04/22/23 19

0 10 200

0.5

116QAM tx data

Am

plitu

de

0 50 100-1

-0.5

0

0.5

116QAM tx oversampled

0 50 100-1

-0.5

0

0.5

116QAM tx oversampled

0 50 100-1

0

1

216QAM rx signal[I]

Am

plitu

de

0 50 100-2

-1

0

1

216QAM rx signal[Q]

-1 0 1

-1

0

1

16QAM phaser

I-data Q-data

Page 20: Khurram Masood 200806100

Theoretical and simulated 16QAM Theoretical and simulated 16QAM BER performanceBER performance

04/22/23 20

0 5 10 15 20 25 30 35 4010

-4

10-3

10-2

10-1

100

Eb/N

0 [dB]

BE

R16QAM performance

16QAM AWGN theory

16QAM AWGN16QAM Rayleigh theory

16QAM Rayleigh