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Send message with optic communication english

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Send message with optic communication english

  1. 1. Send Message With Optic Communication 2016Amir hosein Ataei 1 Change the symbols sent according to the entropy of the transmit to reduce power as well as increase the transmit rate
  2. 2. Introduction • Due to the widespread use of networks and communications in technology, it is therefore very important to solve their problems today. •The seminar that was reviewed during the semester is aimed at expediting common network protocols (Mesh Protocol, Hub Protocol, etc.) and addressing their disadvantages, including (error, noise, distortion), due to magnetic fields, reducing power and increasing transmission rates. •As you know, the most important parameter is high speed communication with minimum error. 2
  3. 3. work explanation • This circuit can receive analog or digital signal and transmit it through the OLT to the optical pulse through the laser then receive the optical pulse and then convert it to electrical signal by the comparator. OLT/ comparator OLT/ comparator Input Signal Laser Detector Output Signal •This circuit is called Full Duplex. Detector Laser Block Diagram OLT : Optical Line Terminal 3
  4. 4. ❖If the input signal is analog, it is converted to an optical pulse by sequential sampling. ❖This method is the link between the wired connection and its conversion into optical pulse which reduces the network traffic and minimizes the error. 4
  5. 5. Schematic Circuit 5
  6. 6. Circuit Function Description • This circuit uses the Atmega32A microcontroller, which uses a 4 * 4 Keypad to generate characters. It scans the Micro Keypad and stores the characters regularly, then codes in the majority method and assigns more 0-bit usernames to lower power consumption. The transmitting frequency is 1MHz and each bit of data is sent every 20ms. The receiver has a 16 * 2 lcd to display the transmitted information so 32 characters are scanned and sent each time. 6
  7. 7. How to get information ❖Each time the information is transmitted by a Phototransistor in the same way that the Base Laser excites the transistor, so that its Collector current travels to the Emitter and is compared to an Op-Amp with reference voltage and then transmits the electric pulse to the Micro. Op-Amp Circuit 7
  8. 8. Investigating topologies Disadvantages Advantages Topology Too many connections Minimum traffic Mesh Blocking the Hub will disrupt the entire network (all traffic is on the Hub) Minimum connections Hub High traffic Each system is a Repeater Ring High traffic and error Very low cost Bus ✓All protocols are noisy against fields caused by electricity. 8
  9. 9. • The main purpose of this project is to solve the problems of computer communication systems, such as: low speed, long-distance signal loss, distortion in the signal and noise, such as auditory noise due to parallel cables passing through each other and their magnetic fields. ✓For example: Data cables with power cables. Cross Talk Noise Project Development 9
  10. 10. • One of the problems we face is the effect of the magnetic field caused by the power cable and the deformation of the signal, which is sometimes not resolved by the Notch filter. •Another problem is the distance between the transmitter and receiver. ✓Optimal fiber is one of the best solutions. Notch Filter Optic Fiber 10
  11. 11. • If our transmission media is airborne in this method due to the presence of flying objects, the communication between the receiver and the receiver may be faulty, so we recommend switching the transmission medium to fiber optic via Patch Cord. 11
  12. 12. Advantages of Optical Fiber I. We need less Repeater during shipping. II. It is immune to the magnetic fields caused by the flow of cables. III. We send data from the cable system more quickly so network traffic is down and data can be transmitted faster. 12
  13. 13. Project Optimization • Zero-level transmissions can be problematic when the propagation environment of this method is airborne, so that changing the environment can affect the Op-Amp circuit at this time. •We use PAM modulation to resolve this problem. 13
  14. 14. Pulse Amplitude Modulation • The modulation is assigned to the zero level and one voltage level each, meaning that the other Op-Amp circuit has no problem detecting the input signal by converting the signal received by the comparator to the two reference voltages and converting it into a digital signal. Note that in this method the bit zero is not due to error. 14
  15. 15. ❖In this modulation the system error decreases sharply but slightly increases power consumption. ❖Due to the use of lasers, we cannot bring the zero level down to 3v because the Forward Voltage Laser is about 2.7v and it should also be higher than this voltage as this level is the comparison level between 0 and 1. 15
  16. 16. Multi Mode ❖The system can send multiple data at different wavelengths via a patch cord, which reduces cost; ❖1. LEDs can be used instead of lasers. ❖(But decreases working distance in MM) ❖2. The number of lines decreases. 16
  17. 17. 1 17
  18. 18. 2 18
  19. 19. How to code in the Huffman method 19
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  21. 21. Huffman problems • The source code is encoded by a fixed length, majority method by field data collection. •Another drawback of the Huffman method in this circuit is that it has a higher bitrate value than the bit rate due to the use of long-range lasers, which increases the noise level which is not desirable. •Because of this, the majority method was used because the Huffman variable-length encoding results in changes in the number of bandwidths required, which is a problem with changing the timing sent per different data. 21
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  23. 23. 1 2 23
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  25. 25. entropy • As can be seen, the untransformed source entropy is less than the encoded entropies (constant and invariant length), which is good for the analog signal property. ✓To send numbers in this way, we compute the probability of field numbers and we conclude that the numbers are among the last values of the probability table. •Encoded sources are seen to have more entropy, but in addition to our entropy slightly changing, the advantages of digitally transmitting data are high noise and bandwidth. 25
  26. 26. Why Can Bit Zero Be So Influential? • Due to the use of the Op-Amp circuit at the input of the received signal and comparing that signal to a reference level because: • 1- Input signal amplification. • 2- Compare the level of logical 0 and 1. ✓If a slight change in the ambient light level occurs when the transmitter laser (which means the signal is zero), the transceiver's transistor photocurrent may change the signal level and eventually result in the transmitted data becoming a conversion This was made easier by adjusting the Multiturn connected to the Op-Amp and by an ambient light detector such as the TSL230. TSL230 26
  27. 27. Power consumption • In the majority-way classification, we use code that has zero bits more than one bit to consume less power. 27
  28. 28. 0 / 1 {Codes} in visual basic attached 28
  29. 29. END

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