Electrical Engineering › Section W · Signal conversion and data transmission › Topic W.4
Transmission modes, modulation, and multiplexing
Sending data is more than switching a wire on and off. Engineers choose how bits are timed and coded, how they ride on carrier waves, how analog signals become pulses, and how many conversations share one channel.
In this topic
- Serial or parallel, synchronous or asynchronous
- Line codes: NRZ, RZ and Manchester
- Bit rate, baud and overhead
- Worked example: symbols and overhead
- Digital data on a carrier: ASK, FSK, PSK
- Quadrature amplitude modulation
- Pulse modulation: PAM, PWM and PPM
- PCM and delta modulation
- Multiplexing: TDM and FDM
- Worked example: a T1 line
- Common mistakes to avoid
- Key takeaways
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