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Note for Analog Communication Systems - ACS by praneeth kuchimanchi

  • Analog Communication Systems - ACS
  • Note
  • Electronics and Communication Engineering
  • B.Tech
  • 2 Topics
  • 165 Views
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Praneeth Kuchimanchi
Praneeth Kuchimanchi
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2.1 Introduction  Analog communication system  The most common carrier is the sinusoidal wave. (Analog) Carrier wave

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2.1 Introduction  Modulation  A process by which some characteristic of a carrier is varied in accordance with a modulating wave (baseband signal).  Sinusoidal Continuous-Wave (CW) modulation  Amplitude modulation  Angle modulation

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Sinusoidal carrier 2.1 Introduction Baseband signal Amplitude Modulation Frequency Modulation

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2.2 Double-Sideband with Carrier or simply Amplitude Modulation Carrier c(t )  Ac cos(2f c ) Baseband m(t ) Modulated Signal s(t )  Ac [1  ka m(t )] cos(2f ct ), where ka is amplitude sensitivity or modulation index  Two required conditions on amplitude sensitivity  1 + ka m(t)  0, which is ensured by |ka m(t)| ≦ 1.  The case of |ka m(t)| > 1 is called overmodulation.  The value of |ka m(t)| is sometimes represented by “percentage” (because it is limited by 1), and is named (|ka m(t)|100)% modulation.  fc >> W, where W is the message bandwidth.  Violation of this condition will cause nonvisualized envelope.

Lecture Notes