This document provides an overview of continuous phase modulation (CPM) techniques. It discusses how CPM works by gradually changing the phase of the carrier signal over the symbol duration for each symbol. Commonly, CPM uses raised cosine or Gaussian filters for detection to prevent inter-symbol interference. Minimum-shift keying is a form of CPM that uses a linear phase trajectory with an excess bandwidth of 1/2. Partial response CPM can also be used to introduce a controlled amount of inter-symbol interference. The document provides examples of CPM variations like continuous phase frequency shift keying and discusses CPM pulse shapes and references.

1. PPT ON CONTINUOUS PHASE
MODULATION

2. MODULATION TECHNIQUES
1.ANALOG
2.DIGITAL
3.SPREAD
SPECTRUM

3. DIGITAL MODULATION
TECHNIQUES
ASK PPM
APSK TCM
CPM OOK
FSK MFSK
MSK PSK
QAM SC-FDE

4. INTRODUCTION ON CPM
Each symbol is modulated by
gradually changing the phase of the
carrier from the starting value to the
final value, over the symbol duration

5. DETECTION METHOD
commonly using a Raised Cosine or a Gaussian
filter.
The raised cosine filter has zero crossings offset by
exactly one symbol time, and so it can yield a full-
response CPM waveform that prevents Inter
symbol Interference (ISI).

6. PHASE TRAJECTORY
• Minimum-shift keying (MSK) is another name
for CPM with an excess bandwidth of 1/2 and
a linear phase trajectory.
• commonly using a Raised Cosine or a Gaussian
filter. The raised cosine filter has zero
crossings offset by exactly one symbol time,
and so it can yield a full-response CPM
waveform that prevents Intersymbol
Interference (ISI).

7. PARTIAL RESPONSE CPM
Partial-response signaling such as duo-binary
signaling is a form of intentional ISI where a
certain number of adjacent symbols interfere
with One extremely popular form of partial-
response CPM is GMSK, which is used by GSM in
most of the world's 2nd generation cell phones.
It is also used in 802.11FHSS, Bluetooth each
symbol in a controlled manner

8. CPFSK
• CPFSK is a commonly used variation
of frequency-shift keying (FSK), which is itself
a special case of analog frequency modulation
• a standard FSK signal does not
have continuous phase, as the modulated
waveform switches instantaneously between
two sinusoids with different frequencies.

9. THEOREY
CPFSK becomes a special case of
a general class of continuous- phase modulated (CPM) signals in
which the carrier

10. FULL REPONSE OF CPM

11. PARTIAL RESPONSE CPM

12. CPM PULSE SHAPES

13. REFERENCES
Leon W. Couch II, "Digital and Analog
Communication Systems, 6th Edition", Prentice-
Hall, Inc., 2001. ISBN 0-13-081223-4
[1]S. Cheng, R. Iyer Sehshadri, M.C. Valenti, and
D. Torrieri, The capacity of noncoherent
continuous-phase frequency shift keying, in Proc.
Conf. on Info. Sci. and Sys (CISS), (Baltimore, MD),
Mar. 2007.

14. THANK U