Line Coding
September 18, 2016
Categorised in: Data Communicaiton & Wireless Sensor Networks
Introduction
The process of converting digital data to digital signals. Digital data – sequences of bits.
Characteristics
- Data rate vs. signal rate
- Data rate (bit rate) – the number of data elements in a unit time (bps).
- Signal rate (pulse, modulation rate, baud rate) – the number of signal element in a unit time (baud).
- No. of Signal Levels
- Two data levels,
Two Signal levels
- Two data levels
Three signal levels
- Two data levels,
- DC components
- It is the mean value of the waveform. If the mean amplitude is zero, there is no DC offset.
- unable to pass a low-pass filter or Over one cycle period if all positive voltage are cancelled by negative volatge then the DC component of the waveform is zero.
- In line coding, the signal with non-zero dc component is treated as distorted one and it can create errors in the received signal.
- Bandwidth
- Although the actual bandwidth of a digital signal is infinite, the effective bandwidth is finite.
- Self synchronization
- the clocks at the sender and the receiver must have the same bit interval. If the receiver clock is faster or slower it will misinterpret the incoming bit stream.
Pratik Kataria is currently learning Springboot and Hibernate.
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