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RLC AM Mode Data Transmission

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Data Transmission Using Amplitude Modulation (AM):

1. Overview:

  • Amplitude Modulation (AM): In AM, the amplitude of a carrier wave is varied in proportion to the waveform being transmitted. This allows the encoding of information in the amplitude variations of the signal.

2. Basic Components:

  • Carrier Wave: The high-frequency signal that is modulated to carry the information.
  • Message Signal: The information signal that is being transmitted, usually a low-frequency signal.
  • Modulator: The circuit or device that performs the modulation process.

3. Modulation Process:

  • Amplitude Modulation Equations:
    • The carrier wave (C(t)) is modulated by multiplying it with the message signal (m(t)).
    • The modulated signal (s(t)) can be represented as: �(�)=��[1+�(�)]cos⁡(2����)s(t)=Ac​[1+m(t)]cos(2πfc​t)
      • �(�)s(t) is the modulated signal.
      • ��Ac​ is the amplitude of the carrier wave.
      • �(�)m(t) is the message signal.
      • ��fc​ is the frequency of the carrier wave.

4. Demodulation Process:

  • The demodulation process is the reverse of modulation and is done to extract the original message signal.
  • The demodulator separates the carrier signal and extracts the envelope (amplitude variations) to recover the message signal.

5. RLC (Radio Link Control) in LTE:

  • RLC is a layer in the LTE protocol stack responsible for reliable data transfer between the transmitting and receiving ends.
  • It provides various functionalities such as segmentation and reassembly of data packets, error detection, and retransmission.