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Modulation

Description

College ECCF (Modulation) Mind Map on Modulation, created by log2022 on 10/11/2013.
log2022
Mind Map by log2022, updated more than 1 year ago
log2022
Created by log2022 over 11 years ago
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Resource summary

Modulation
  1. AM power distribution
    1. Current calculations
    2. Calculation of modulation index
      1. Bandwidth / frequency range
        1. BW increases with increase in rate of data transmission
        2. Types of modulation
          1. Analog modulation
            1. Digital modulation
            2. Modulation by complex signals
              1. Mathematical representation
                1. Time domain description
                  1. Frequency domain discription
                  2. Why modulate
                    1. Reduces antenna height
                      1. lamda = speed of light / frequency
                        1. height of antenna = lamda / 4
                      2. Avoids mixing of signals
                        1. Frequency slot allocation
                        2. Increases range of communication
                          1. frequency increases / attenuation decreases
                          2. Improves signal reception quality
                            1. Signal noise reduces due to modulation techniques
                          3. AM transmitters
                            1. Low level
                              1. High level
                              2. Disadvantage
                                1. power inefficient
                                  1. Bandwidth inefficient
                                    1. Prone to noise
                                    2. Modulation index
                                      1. Linear modulation m<=1
                                        1. Over modulation
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