Digital Communications Midterm :D
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Digital Communications Midterm :D
- 3. BINARY TRANSMISSION CONCEPTS AND PRINCIPLES •
- 10. BINARY TRANSMISSION CONCEPTS AND PRINCIPLES •
- 11. Information codes or character sets •
- 12. Information codes or character sets •
- 13. Information codes or character sets •
- 16. Synchronization on Digital Signals •
- 17. Synchronization on Digital Signals •
- 18. Synchronization on Digital Signals •
- 19. Baseband, Data Rate, and Error Rate •
- 20. Baseband, Data Rate, and Error Rate •
- 21. Baseband, Data Rate, and Error Rate •
- 28. Digital Transmission over VoiceGrade Circuits •
- 29. Digital Transmission over VoiceGrade Circuits •
- 30. Digital Transmission over VoiceGrade Circuits •
- 31. Digital Transmission over VoiceGrade Circuits •
- 38. PERIODIC SIGNALS
- 41. Frequency Domain Concepts • Signal usually made up of many frequencies • Components are sine (or cosine) waves • Can be shown (Fourier analysis) that any continuous signal is made up of component sine waves
- 43. ANALOG TRANSMISSION OF DIGITAL DATA • Analog Transmission occurs when the signal sent over the transmission media continuously varies from one state to another in a wave-like pattern. e.g. telephone networks, originally built for human speech rather than data. • Advantage for long distance communications: much less attenuation for analog carrier than digital
- 44. ILLUSTRATE ANALOG TRANSMISSON OF DIGITAL DATA
- 45. Information Capacity - Information capacity is a measure of how much information can be propagated through a communication system.
- 46. M-ary Encoding
- 47. Baud and Minimum Bandwidth •
- 48. Baud and Minimum Bandwidth •
- 50. Error Detection
- 57. Error Correction
- 60. Error Correction
- 61. Protocols
- 62. Protocols •
- 63. Protocols •
- 64. Protocols •
- 65. Protocols •
- 66. Protocols •
- 67. Protocols •
- 68. Protocols •
- 69. SYNCHRONIZATION
- 73. Digital modulation Understanding different modulation technique
- 74. Amplitude shift keying • The amplitude of the carrier is changed in response to information and all else is kept fixed. • Bit 1 is transmitted by a carrier of one particular amplitude. To transmit 0, we change the amplitude keeping the frequency constant. • ON-OFF KEYING – is a special form of ASK, where one of the amplitudes is zero
- 77. frequency shift keying • The frequency of the carrier is changed in response to the information signal, one particular frequency for a 1 and another frequency for a 0. • FSK signal is represented by the eqn.