Gujarat Technological University Birla Vishvakarma Mahavidhyalay Electronics & Telecommunication Department Topic :- FSK, M-ary FSK, BPSK Modulation & Demodulation SUBMITED BY : - APAR TRIVEDI :130080112057 VATSAL BODIWALA :140083112002 GAURANG PRAPATI :140083112012 Under the Guidance Prof. D.C.Dalwadi ET Department, BVM.
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Gujarat Technological University
Birla Vishvakarma Mahavidhyalay
Electronics & Telecommunication Department
Topic :- FSK, M-ary FSK, BPSK Modulation &
Demodulation
SUBMI T ED BY: -
APAR T RI VEDI : 130080112057
VAT SAL BO DI WALA : 140083112002
G AURANG PRAPAT I : 140083112012 Under the Guidance
Prof. D.C.Dalwadi
ET Department, BVM.
OUTLET :-
Introduction to FSK
Relationship between baud rate and bandwidth in FSK
FSK Example
BPSK Modulation & Demodulation
M-ary FSK
Frequency Shift Keying
Frequency of the carrier is varied to represent digital data (binary 0/1)
Peak amplitude and phase remain constant.
Avoid noise interference by looking at frequencies (change of a signal) and ignoring amplitudes.
Limitations of FSK is the physical capabilities of the carrier.
f1 and f2 equally offset by equal opposite amounts to the carrier freq.
In MFSK more than 2 freq are used, each signal element represents more than one bit
Fig of FSK :-
0)2cos(
1)2cos()(
2
1
binarytfA
binarytfAts
Relationship between baud rate and bandwidth in FSK
Relation cont…..
FSK shifts between two carrier frequencies
FSK spectrum = combination of two ASK spectra centered on fc1 and fc0.
BW = fc1-fc0 + Nbaud
FSK Examples (cont.)
1. What is the Find the minimum bandwidth for an FSK signal transmitting at 2000 bps. Transmission is in half-
duplex mode, and the carriers are separated by 3000 Hz.
• Because For FSK
BW = baud rate + fc1 - fc0
BW = bit rate + fc1 - fc0 = 2000 + 3000 = 5000 Hz
2. What is the maximum bit rates for an FSK signal if the bandwidth of the medium is 12,000 Hz and the
difference between the two carriers is 2000 Hz. Transmission is in full-duplex mode.
– Because the transmission is full duplex, only 6000 Hz is allocated for each direction.