Wireless communication - assignment

Running head: WIRELESS COMMUNICATION
WIRELESS COMMUNICATION
Name of the Student:
Name of the University:
Author Note:

1WIRELESS COMMUNICATION
The reason of using Spread Spectrum Transmission:
 Wide range of bandwidth.
 It can eliminate crosstalk.
 Cost effective to use.
 The strength of power signal is high.
 Single bandwidth of spectrum can be used by the multiple users.
Comparison and contrast of two methods of spectrum transmission:
The two types of spectrum transmission is Direct Sequence Spread Spectrum (DSSS),
Frequency Hopped Spread Spectrum (FHSS)
Contrast between FHSS and DSSS:
FHSS DSSS
Use of multiple frequencies is done. Use of single frequency is done.
At one instant of the time the user’s frequency
is hard to find out.
The user’s frequency remains same after the
allocation.
Reuse of frequency is permitted (Zou et
al.,2015).
Reuse of frequency is not permitted.
Strength of the power signal is high Strength of the power signal is low.
It is never affected by any interface. It can be affected by the interfaces.
The use of FHSS is cheaper. Use of DSSS is expensive.
This technique is commonly used. This is not a frequently used technique.

2WIRELESS COMMUNICATION
Similarities between FHSS and DSSS:
 The security issues for both FHSS and DSSS are same.
 Both FHSS and DSSS are the spread spectrum.
Different components of radio system:
Radio transmitter:
Power supply, Amplifier, Oscillator, Antenna, Modulator
Radio receiver:
Antenna, RF amplifier, Detector, Audio Amplifier, Tuner
Different mixers:
There are two types of radio frequency mixer- active (using FET or BJT) and passive ( using
diode). Further, according to the configuration the mixer can be classified into three categories-
unbalanced, single balanced and double balanced.
Active RF mixer:
To increase the strength of the resulting signal the amplifying devices are used in the active RF
mixer(Kaplun et al.,2017). It improves the isolation between several ports. However the power
consumption is high in this technique.