logo

DIGITAL COMMUNICATION SYSTEM BY AFFILIATE

   

Added on  2021-04-16

25 Pages3898 Words171 Views
DIGITAL COMMUNICATION SYSTEMBYAFFILIATE

ContentsI.0 INTRODUCTION....................................................................................................................21.1 OBJECTIVE.........................................................................................................................22.0 SESSION IMPLEMENTATIONS.........................................................................................22.1 PULSE CODE MODULATION.........................................................................................22.1.1 Low Pass Filter................................................................................................................32.1.2 Decoder...........................................................................................................................32.1.3 Setting up PCM encoder..................................................................................................42.1.4 Setting up PCM decoding................................................................................................52.1.4 PCM Sine Wave.............................................................................................................62.1.6 Sound form PCM Decoder...........................................................................................72.1.7 The PCM headphone.....................................................................................................82.2 THE AMPLITUDE SHIFT KEYING................................................................................82.2.1 Demodulating ASK........................................................................................................92.2.2 Comparing the signal ASK.........................................................................................103.0 EXPERIMENT QUESTIONS..............................................................................................123.1 Experiment 12: PCM Encoding.......................................................................................123.2 Experiment 13: PCM Decoding.......................................................................................143.3 EXPERIMENT 10: AMPLITUDE SHIFT KEYING DEMODULATION..................153.3.1 Part A: Generating an ASK signal................................................................................153.3.2 PART B: Demodulating an ASK Signal.......................................................................163.3.3 PART C: Restoring the Recovered Digital Signal using Comparator..........................163.4 Experiment 11: ASK Demodulation Using Product Detection......................................18

4.0 CONCLUSION.....................................................................................................................19REFERENCES............................................................................................................................20I.0 INTRODUCTIONDigital communication system is a method of correspondence where the data or the thinking is encoded carefully as circumspect signs and electronically exchanged to the beneficiaries. Digital communication system is a standout amongst the most normally utilized method of communication in the present situation. Associations by and large depend on this mode for all their business communication.Currently, the digital communication is taking over from the analog systems of communication , a good example of the situation where the digital systems have taken over the analog systems is the telecommunication channel. It is therefore very important and better to have a good know how of the digital communication systems. For the communication to be termed complete, there must pass through a medium. The channel must be there for the communication to be complete, or even for the communication to take place. This is not limited to the kind of channel the communication uses, this might be optical fiber cables, free spaces or even the copper wire.Assuming that the channel is not shared as required, then transmission of information could only take place in a single one direction creating a lot of shortcomings when it comes to communication.The time division multiplexing is one of the method that is used for sharing channel, this method involves allowing the user to have full access to the channel though the period that the user has been allowed is very short.

Another method is the frequency division multiplexing, which involves allowing use to have uninterrupted time with the channel for as long time period.1.1 OBJECTIVEThe main objective of this session is to develop a digital communication systems that are effective and efficient enough to completely take over the analog systems of communication.2.0 SESSION IMPLEMENTATIONS2.1 PULSE CODE MODULATIONThis is a system that is used to encode the analog system to a 0s and 1s stream. This PCM encoder uses the codec in changing the analog voltage that is in between the -2 and the +2 into an 8 bit binary numbers.2.1.1 Low Pass FilterThis kind of channel expels all high recurrence components that are inside the information simple analog signal which is more noteworthy than the most astounding recurrence of the message motion, to abstain from associating of the message signal. The figure below shows how low pass filter works.

2.1.2 DecoderThe decoder circuit unravels the beat coded waveform to imitate the first flag. This circuit goes about as the demodulator.To recuperate the first flag from the examined information, a "demodulator" can apply the technique of regulation in switch. After each testing period, the demodulator peruses the following worth and movements the yield flag to the new esteem. Because of these changes, the flag has a lot of high-recurrence vitality caused by associating. To expel these unwanted frequencies and leave the first flag, the demodulator goes the flag through simple channels that smother vitality outside the normal recurrence go

2.1.3 Setting up PCM encoderThe contribution to the PCM ENCODER module is a simple message. This should be obliged to a characterized transfer speed and sufficiency extend. The most extreme admissible message transmission capacity will rely on the examining rate that is to be utilized. The plentifulness extend must be held inside the ± 2.0 volts scope of the TIMS ANALOG REFERENCE LEVEL. This is with regards to the information abundancy limits that is set for every unit simple module. A well ordered depiction of the task of the module takes after: 1. The module is driven by an outer TTL clock. 2. The info simple message is then inspected occasionally. The example rate is then controlled by the outer clock. 3. The examining is an example and-hold task. This is inward to the module, and it can't be seen by the client . What is held is abundancy of simple message at inspecting moment. 4. Each example adequacy is contrasted and the limited arrangement of abundancy levels. These are inside a range of the ± 2.0 volts (the TIMS ANALOG REFERENCE LEVEL). All this are the framework quantizing levels.

End of preview

Want to access all the pages? Upload your documents or become a member.

Related Documents
MATLAB Assignment: Communications IV
|18
|2723
|292

Compute Network And Security Analysis
|22
|3456
|9

Digital Encoding, Multiplexing Techniques and Network Communication Protocols
|8
|1168
|438

Wireless Networks and Communications: Encoding, Error Control, Multiplexing, WiFi
|12
|1563
|215

Comparison of Different Modulation Techniques and Error Detection Process
|17
|2315
|81

Mobile & Satellite Communication Systems
|9
|1899
|192