DESIGN OF WIRELESS DATA MODEM USING FSK

Done by

C.VIGNESH RAJA (13109106098) P.VIJAYA KUMAR (13109106099) D.VINOTH KUMAR(13109106101)

Abstract

• FSK (Frequency Shift Keying) is also known as frequency shift modulation and frequency shift signaling. Frequency Shift Keying is a data signal converted into a specific frequency or tone in order to transmit it over wire, cable, optical fiber or wireless media to a destination point. The history of FSK dates back to the early 1900s, when this technique was discovered and then used to work alongside teleprinters to transmit messages by radio (RTTY). But FSK, with some modifications, is still effective in many instances including the digital world where it is commonly used in conjunction with computers and low speed modems. In fact, the contributions of FSK are much more far reaching. For example, the principle of FSK has laid the path to the development of other similar techniques such as the Audio Frequency Shift Keying (AFSK) and Multiple Frequency Shift Keying (MFSK) just to name a few.

FSK MODEM

A modem (modulator-demodulator) is a device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information.

The goal is to produce a signal that can be transmitted easily and decoded to reproduce the original digital data.

CIRCUIT DIAGRAM

FSK MODULATOR:

FSK DEMODULATOR:

CIRCUIT DIAGRAM