Unipolar Return to Zero (RZ) Coding Quiz

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Explain the shortcomings of NRZ coding and how return to zero (RZ) code overcomes them.

NRZ coding suffers from lack of synchronization, non-zero dc component and baseline wandering. RZ code overcomes these shortcomings by representing logic 1 with a non-zero voltage level and logic 0 with a zero voltage level, requiring transitions at the middle point of the bit interval.

What are the main features of Unipolar NRZ coding?

The main features of Unipolar NRZ coding are ease of generation, requirement of only a single power supply, relatively low bandwidth, and a transmission normalized power for a single bit per unit line resistance that is double compared to their polar counterparts.

Explain the representation of logic 1 and logic 0 in RZ line coding.

In RZ line coding, logic 1 is represented by a non-zero voltage level during a portion of the bit interval and a transition to zero at the middle point of the bit interval. Logic 0 is indicated by a zero voltage level during the entire bit interval.

What is the main advantage of unipolar RZ coding?

<p>The main advantage of unipolar RZ coding is the ease of generation since it implements a single power supply.</p> Signup and view all the answers

What are the implications of a RZ signal pulse being only half the length of an NRZ pulse?

<p>The implication is that unipolar RZ requires twice the bandwidth of the NRZ code.</p> Signup and view all the answers

NRZ shortcomings

NRZ coding has synchronization issues, a non-zero DC component, and baseline wandering.

RZ solution

Return-to-Zero coding addresses NRZ problems by having transitions in the middle of the bit.