Assignment 10 C KEY PDF

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Assignment for digital transmissions, telecommunications....

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ELCM 252 Digital Transmission Techniques Assignment on Module 10 KEY Name: ________________________

___ / 16 = _____%

1. Define BIT rate: Mod 10.1 p2; The rate of change of digital information 2. Define BAUD rate: Mod 10.1 p5; The rate of change after Coding and Modulation has occurred 3. Are Digital Signals vulnerable to noise? Mod 10.2 p7; Digital Signals are less vulnerable to noise 4. What is the advantage of higher frequencies? Mod 10.3 p11; The higher the frequency, the further the signals travel 5. How is Lambda calculated? Mod 10.3 p11; Lambda = Speed of light/ frequency 6. What is a very high analog frequency called? Mod 10.3 p13; Carrier, Carrier Frequency, Carrier Wave 7. What is the modulation process? Mod 10.3 p15; Process of impressing intelligence upon a carrier 8. During the modulation process, low frequencies voice signals are converted to what? Mod 10.4 p17; Low frequencies are converted to high frequency signal 9. In ASK, what stays consistent? Mod 10.5 p21; Amplitude Shift Keying, the Frequency stays consistent

10. In FKS, what stays consistent? 1

Mod 10.5 p22; Frequency Shift Keying, the Amplitude stays consistent 11. In PSK, how is a logic state change indicated on the output signal? Mod 10.6 p24; When the input logic state changes, the output shifts by 180 degrees 12. What does QPSK stand for? Mod 10.7 p25; QPSK – Quadrature Phase Shift Keying 13. What does QAM stand for? Mod 10.8 p27; QAM – Quadrature Amplitude Modulation 14. What bits determine polarity in QAM? Mod 10.8 p27; The I and Q bits determine polarity 15. Give 2 Carrier less modulation methods? Mod 10.9 p29; Spread Spectrum and Ultra-Wide Carrier less modulation

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