Wireless Communication: Spread Spectrum Transmission, Radio System Components, and Advanced Technologies

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

1WIRELESS COMMUNICATION
Answer to the Question no 1.
1.1The reason of using Spread Spectrum Transmission:
There are several attributes of the spread spectrum that makes desirable transmission
technique. Spread spectrum has a wide bandwidth range which enables the user to choose among
the bandwidth. The main advantage of the spread spectrum is that is can resists interface so that
use of spread spectrum can eliminate cross talk (Bi, Zen & Zhang, 2016). Moreover this
technique is cost effective way of transmission. In case of spread spectrum the power of the
signal is very high. In case of spread spectrum, the bandwidth of signal spectrum can be used by
the various users. Moreover it provides better security and reduces the multipath fading.
1.2 Contrast and comparison between the two methods of the transmission of the
spectrum:
The two major types of spread spectrum transmission are- Frequency Hopped Spread
Spectrum Transmission and Direct Sequence Spread Spectrum `Transmission.
Differences between these two transmission techniques:
Frequency Hopped Spread Spectrum
Transmission
Direct Sequence Spread Spectrum
Transmission
Frequency the user is using is hard to find out at
one instance of time
The frequency, the user is using remains the same
after the allocation.
Frequency can be reused in this method. Frequency cannot be reused in this method.

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The strength of signal used in this method is high. The strength of signal used in this method is low.
In this method, the signal is not affected by the
interface.
In this method the signal is sensitive to the
interface.
Use of this kind of transmission technique is cheap. Use of this kind of transmission technique is
expensive.
Frequency Hopped Spread Spectrum Transmission
is a commonly used technique for the transmission.
It is not a commonly used technique.
In this technique multiple frequencies can be used. Use of single frequency is permitted.
Comparison between these two frequency techniques:
 In case of both frequencies the security concerns are same.
 Both Frequency Hopped Spread Spectrum and Direct Sequence Spread Spectrum belong
to the same spread spectrum group.
Answer to the Question no 2.
2.1 Components of the radio system:
The components of the radio system can be categorized into two different categories:
Radio transmitter and Radio Receiver.
Under these two categories there are components of the radio system.
Amplifier, Antenna, Power supply and the modulator come under the radio transmitter
section. These components help to transmit the radio signal.

3WIRELESS COMMUNICATION
Under the category of radio receiver there are radio frequency amplifier, audio amplifier,
tuner and antenna. These components help to receive the radio signal.
2.2 Mixers of different kind:
Active mixer and passive mixer are the two types of mixer in radio frequency (Kaplun et
al.,2017). According to the configuration, mixer can be classified into three categories-
 Single Balanced
 Double Balanced
 Unbalanced
2.3 Active Radio Frequency Mixer:
Amplifiers are used in active mixer in order to increase the strength of the signal. The
isolation between two ports is improved using this signal, although power consumption is high in
active radio frequency mixer. This type frequency mixer is used in implementation of RFIC as it
maintains low power for driving the LO port along with good conversion gain and good isolation
between ports.