Assignment on Two level Amplitude Shift Keying

Assignment No 2
1. Convert the binary data “110101” into analog waveforms using following modulation
techniques:
a) Two level Amplitude Shift Keying
The binary data 1 represents the highest amplitude; it is represented by sine waves
while the binary data 0 represents the lowest amplitude which is equal to zero
amplitude. (Forouzan., 2013)
b) Two level Frequency Shift Keying
It represents the binary data which is being converted to analog through variation
of the frequency of the carrier signal. The binary data 1 represents the highest
frequency signal which is shown by two sine waves while the binary data 0
represents the lowest frequency signal shown by a single sine wave
.
c) Two level Phase Shift Keying

Binary data with different phase changes are represented by an analog waveform.
The binary data 1 is represented by sine wave while binary data 0 is represented
by a cosine wave.
d) Differential Phase shift keying
The phase of the signal depends on previous data bit, the binary data 1 has a
reversed phase and it is represented by a phase difference with reversed signal
while binary data 0 has no reversed phase and it is represented without a signal
phase difference
.
e) Four level Amplitude Shift Keying
Two-bit data sequence 00, 01, 10 and 11 in this technique is used to provide four
amplitudes levels where the binary 00 represent the lowest amplitude and the
others have higher amplitudes.

f) Four level Phase Shift Keying
Two data bits are transmitted per symbol and the individual symbol is represented
with different shifts as in the diagram below.
g) Eight level Amplitude Shift Keying
The three-bit data is used to provide the eight amplitudes levels namely
000.001,010,011,100,101,110 and 111. The binary data 000 has the lowest
amplitude and remaining data set has higher amplitude.