Radio communication

1. PARTICIPATORY REPORT AND ASSESSMENT(PRA)
DIGITAL RADIO COMMUNICATION
ELECTRONICS AND COMMUNICATIONS ENGINEERING(ECE)
SESSION(2022-23)
ANALOG AND DIGITAL COMMUNICATIONS(ADC)
SUBMITTED TO:
MR:G.NARASIMHULU SIR
PROFESSOR
ECE DEPARTMENT
VBIT, HYDERABAD
SUBMITTED BY:
NAME : A. Srikanth Reddy
Hall Ticket no:21P61A0402
Section:ECE-A
Year/Sem:II/II

2. TOPICS
 Introduction
 Digital Radio Communication
 Types of digital audio broadcasting
 Comparison between analog and digital communication
 Advantages and Disadvantages
 Applications
 Conclusion
 Reference

3. INTRODUCTION
Digital radio is the use of digital technology to transmit or receive across the radio spectrum.
Digital transmission by radio waves includes digital broadcasting, and especially digital audio
radio services.

4. DIGITAL RADIO COMMUNICATION:
 Digital radio is the transmission and reception of sound processed into
patterns of numbers, or "digits" – hence the term "digital radio." In
contrast, traditional analog radios process TV into patterns of electrical
signals that resemble sound waves.
 Digital radio reception is more resistant to interference and eliminates
many imperfections of analog radio transmission and reception. However,
there may be some interference to digital radio signals in areas that are far
away from a station's transmitter. FM digital radio can provide clear sound
comparable in quality to CDs, and AM digital radio can provide sound
quality equivalent to that of standard analog FM. FM digital radio also
allows broadcasters to offer additional audio channels to the public, using
their existing FM frequency.

6. Types of digital audio broadcasting:
 Eureka 147 (branded as DAB
 DAB+
 ISDB-TSB.
 Internet radio (Technically not a true Broadcast system)
 T-DMB V-Radio.
 FM band in-band on-channel (FM IBOC)
 HD Radio (OFDM modulation over FM and AM band IBOC sidebands)
 AM band in-band on-channel (AM IBOC)
 Satellite radio

7. Analog vs Digital:

8. ADVANTAGES:
 Advantages:
1. More conversations can take place on one channel.
2. Its more spectrally efficient, certainly, but the channel allocation depends on the
system (FDMA v. TDMA)
3. Unit ID, enhanced text messages and status buttons can all be embedded into a digital
radio channel.
4. Your bandwidth consumption is reduced with digital radios.
5. Both existing infrastructure and antenna systems can be used for transmitting digital
signals. This is for FDMA (ie: dPMR). TDMA style systems require some
modifications to take into account the accurate timing requirements.

9. Disadvantages
 Disadvantages:
1. It could take more time for first-time users to learn how to use. (For
dPMR, the only change is how to select a digital channel rather than
analogue. Other digital systems DO have more to learn, but dPMR was
chosen because of its simplicity).
2. Digital signals will not tolerate RF (radio frequency) signals, and as a
result if there is ever too much RF noise the signal can completely drop in
error. (dPMR operates in the RF environment very similar to analogue, in
both cases, if here is too much noise, both will fail. The difference is that
an analogue radio will produce noise at the speaker which requires the
operator to adjust the squelch control, the digital one will just go quiet).

10. APPLICATIONS
 Computer modems
 DSL
 Microwave and Satellite communications
 PCS
 DIGITAL TV

11. CONCLUSION
In this PRA I have acknowledge about DIGITAL RADIO COMMUNICATION.
I also known that digital radio communication is using in our technology is working a
crucial role in this scientific World.

12. REFERENCE
1. My professor Mr.G.NARASIMHULU sir.
2. https://en.m.wikipedia.org/wiki/Digital_radio
3. Analog and Digital electronics by D. Chattopadhyay.