Software defined radio (SDR) is a radio communication system where components implemented in hardware, such as mixers and filters, are instead implemented by software. An SDR system uses a microprocessor to map user data to waveforms which are then converted to RF signals and transmitted via antenna. Received signals are sampled, digitized, and processed in real time by a general processor. SDR offers benefits like cost efficiency, flexibility, and avoiding interference, but faces challenges like developing antennas that can dynamically tune across wide bandwidths and sampling speeds fast enough to digitize high frequencies. Applications of SDR include military systems, NASA projects, and future 5G networks.

1. Software
Defined Radio
(SDR)
Prepared by : Laila Heilat
Instructor : Dr.Haitham Bany
Salameh

2. Outlines
 Introduction
 Software controlled radio
 Define SDR
 Explain the concept of SDR system
 Challenges for SDR
 Advantages and disadvantages of SDR
 Applications that use SDR
 Summary

3. Introduction
With the exponential growth in the ways and means by which
people need to communicate - modifying radio devices easily
and cost-effectively has become business critical.

4. Software Controlled Radio
the user don’t need to flip a switch to access
each network, the standard selection is
controlled by software running on the phone.

5. What is the Software Defined Radio ??
(SDR) is a radio
communication system where
components that have been
implemented in hardware (e.g.
mixers, filters, amplifiers,
modulators/demodulators,
etc.) are instead implemented
by means of software.

6. How to implement SDR(Transmitter side ) ?
.
(a) The user data is mapped to the desired
waveform in the microprocessor. The digital
samples are then converted directly into an RF
signal and sent to the antenna

7. How to implement SDR ( Reciever side
)?
(b)The transmitted signal enters the receiver at the
antenna, is sampled and digitized, and finally
processed in real time by a general purpose processor.

8. Digital signal processor (DSP) since
it intelligence to enable multitasking.
Another processer is A field-
programmable gate array (FPGA)
Application specific
integrated circuit (ASIC)
Micro Processors types

9. what challenges must be overcome to
achieve this radio architecture(1)?
 Most antennas are
mechanical structures and
are difficult to tune
dynamically.
SDR shouldn’t limit the Fc
or BW of the waveform.
The antenna should be
able to capture EM waves
(1MHz-60GHz )

10. What are the challenges that must overcome
to achieve this radio architecture?(2)
•Selection of the desired signal and rejection of
interferers (channel selection) is a key feature.
• the antenna and filter(s) required to implement
the channel selection are usually
electromechanical structures and are difficult to
tune dynamically.

11.  Following Nyquist’s criterion, the signal must
be sampled twice at the maximum frequency
(e.g., 2 9 60 GHz). Capabilities of currently
available A/D converters are nowhere close
to 120 GHz
what are the challenges that must be
overcome to achieve this radio
architecture?(3)

12.  Without an RF front end to select the band
of interest, the entire band must be
digitized.
What are the challenges that must overcome
to achieve this radio architecture?(2)

13. More details of block
diagram

14. Benefits of SDR
SDRs efficiency and cost effectiveness
intelligence to enable multitasking
 can be flexible enough to avoid the
"limited spectrum" .
transmitters can avoid interference by
selecting unused frequencies

15. Applications using SDR
• Like many other breakthrough technologies SDR is
also initiated by Military.
• Again related terms are DARPA, NSA, Navy etc.
• DARPA with NASA started a Communication
reform project in 1992 named “Speakeasy I - II - III”
•It will be used in 5G

16. Conclusions & Summary
SDR is a radio communication system where the
components that have been implemented in software.
We can design SDR using micro processer , DAC &
Antenna
We can use DSP processer because of many
advantages that explained

17. Conclusions & Summary
Challenges that have appear in practical design of
SDR (Antenna, channel selection , needs for RF &
DAC )
Benefits of using SDR (cost , flexibility ,intelligence ,
efficiency & avoiding interference )
Applications using SDR (Military , NASA & 5G)

18. Any questions ???