Performance Analysis (BER vs Eb/N0) of BPSK,QPSK, DPSK and M-PSK

Slide Presentation on "Performance Analysis (BER vs Eb/N0) of BPSK, QPSK, DPSK and M-PSK"

1. Performance analysis (BER vs E b /N ) of BPSK,QPSK, DPSK and M-PSK Presented by Ilyas Majeed

2. Content: Introduction What is BPSK? What is QPSK? What is DPSK? What is M-PSK? Performance Analysis of all PSK modulation techniques Conclusion 7/11/2019 Performance analysis of BPSK, QPSK, MPSK and DPSK 2

3. Introduction Phase Shift Keying (PSK) is digital modulation schemes that conveys data by changing or modulating phase of ref. signal(carrier wave). Uses finite number of phases, each assigned with a unique pattern of binary digits. Several criteria such as power efficiency, bandwidth efficiency and BER are used in order to choose the most suitable modulation technique. 7/11/2019 Performance analysis of BPSK, QPSK, MPSK and DPSK 3

4. WHAT is BPSK ? Binary phase shift keying is digital modulation scheme that conveys data by changing or modulating two differential phases of a reference signal which are separated by 180⁰ and so can be termed as 2-PSK. Use different phased signals to represent binary values 0 = in phase with reference 1 = out of phase with reference 7/11/2019 Performance analysis of BPSK, QPSK, MPSK and DPSK 4

5. Amplitude Time 1 1 1 baud 1 baud 1 baud 1 second 1 baud General expressions for BPSK: s (t) cos2 π f c t ; for binary 0 s 1 (t) cos2 π f c t ; for binary 1 Waveform of BPSK:   7/11/2019 Performance analysis of BPSK, QPSK, MPSK and DPSK 5

6. What is QPSK ? In QPSK, two bits are grouped together to form signals, and one of the four possible cases are: 00,01,10 and 11 is transmitted. PSK that uses phase shifts of 90⁰= π /2rad. 4 different signals are generated, each representing two bits. Higher data rate than BPSK, while bandwidth occupancy remains the same. 7/11/2019 Performance analysis of BPSK, QPSK, MPSK and DPSK 6

7. 10 00 01 11 4-PSK (Q-PSK) General expressions for QPSK: S QPSK (t) cos[2 π f c t +(i-1) QPSK Constellation :   7/11/2019 Performance analysis of BPSK, QPSK, MPSK and DPSK 7

8. What is DPSK ? DPSK is a non coherent form of PSK which avoids the need of coherence ref. signal at receiver DPSK is similar to BPSK with the only addition of differential encoder. Let {d k } denote the differentially encoded sequence If the incoming binary symbol b k is 1, leave the symbol d k unchanged with respect to the previous bit. If the incoming binary symbol b k is 0, change the symbol d k with respect to the previous bit. 7/11/2019 Performance analysis of BPSK, QPSK, MPSK and DPSK 8

9. Amplitude Time 1 1 1 baud 1 baud 1 baud 1 second 1 baud Differential PSK 1 Constellation Diagram : 7/11/2019 Performance analysis of BPSK, QPSK, MPSK and DPSK 9

10. M- ary Phase Shift Keying(MPSK) In M- ary PSK, the carrier phase takes on one of the M possible values, namely  i = 2 * ( i - 1)  / M where i = 1, 2, 3, …..M. The modulated waveform can be expressed as where E s is energy per symbol = (log 2 M) E b T s is symbol period = (log 2 M) T b. 7/11/2019 Performance analysis of BPSK, QPSK, MPSK and DPSK 10

11. Error Performance 7/11/2019 Performance analysis of BPSK, QPSK, MPSK and DPSK 11

12. MATLAB Code 7/11/2019 Performance analysis of BPSK, QPSK, MPSK and DPSK 12

13. MATLAB Code 7/11/2019 Performance analysis of BPSK, QPSK, MPSK and DPSK 13

14. 7/11/2019 Performance analysis of BPSK, QPSK, MPSK and DPSK 14

15. Conclusion In all the schemes BER decreases with increase in the E b /N value. Increasing the E b /N value means increasing the signal power w.r.t. noise energy. The error rate increases with the value of M increases i.e , BER of 8-PSK is higher than BER of 4-PSK BER of 16-PSK is higher than BER of 8-PSK BER of 32-PSK is higher than BER of 16-PSK BER is lowest for BPSK but the bit rate is low(single bit is sent) 7/11/2019 Performance analysis of BPSK, QPSK, MPSK and DPSK 15

16. Thank You 7/11/2019 Performance analysis of BPSK, QPSK, MPSK and DPSK 16