Continuous Phase Frequency Shift Keying

1. Continuous Phase Frequency Shift Keying ( CPFSK )

2. Continuous Phase Frequency Shift Keying - Applications CPFSK Applications • GSM Technology • Bluetooth Technology • DECT Technology & many more …… • GSM Technology • Bluetooth Technology • DECT Technology & many more ……

3. Continuous Phase Frequency Shift Keying - Applications

4. Continuous Phase Frequency Shift Keying - Applications

5. Continuous Phase Frequency Shift Keying - Applications • DECT is a standard for digital wireless telephone technology • Developed January 1988 by the ETSI • DECT was first known as Digital European Cordless Telecommunications • DECT change to its current name – Global Acceptance • It is high-speed quality, low power technology • Uses TDMA to transmit the radio signal to DECT phone • Works from a base station with a handset

6. Continuous Phase Frequency Shift Keying - Applications Major Applications:- • Cordless Private Branch Exchange (PBX) • Wireless Local Loop • Cordless Terminal Mobility • Home Cordless Phone • GSM / DECT internetworking

7. Continuous Phase Frequency Shift Keying - Applications Asia Europe North America Africa South America Australia

8. Continuous Phase Frequency Shift Keying - Applications Why CPFSK Modulation & Demodulation ? • Linear Modulations like QPSK, OQPSK, DPSK, FSK etc. - phase discontinuity problem - phase transitions cause problems for band limited and power-efficient transmission especially in an interference limited environment. - the sharp phase changes in the modulated signal cause relatively prominent side- lobe levels of the signal spectrum compared to the main lobe. • In a cellular communication system like GSM – Frequency Reuse is done extensively, these side-lobe levels should be as small as possible. • The abrupt phase transitions generate frequency components that have significant amplitudes. Thus the resultant power in the side-lobes causes co-channel and inter- channel interference. • High power amplifiers may have to be operated in the non-linear region in order to improve the transmission power. Continuous phase modulation schemes are preferred to counter these problems.

9. Continuous Phase Frequency Shift Keying - Applications CPFSK Modulation - Demodulation & its types • MSK modulation & demodulation • GMSK modulation & demodulation • FSK modulation & demodulation • GFSK modulation & demodulation

10. Continuous Phase Frequency Shift Keying - Applications CPFSK Modulation - Demodulation & its types

11. Continuous Phase Frequency Shift Keying - Applications CPFSK Modulation - Demodulation & its types

12. Continuous Phase Frequency Shift Keying - Applications CPFSK Modulation - Demodulation & its types

13. Continuous Phase Frequency Shift Keying - Applications CPFSK Modulation - Demodulation & its types

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