통신실험 예비11

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본문내용

1. What is the reason for using PRBSs?

- It`s little difficult to build a circuit which produces random binary signals. but, periodic sequences which appear to be random can easily be generated using a number of shift registers. cause these sequences only appear to be random, so, PRBS is used like this.

2. In what way are PRBSs similar to random data?

- the power of a unipolar binary signal is the same as the power of a unipolar square wave of the same amplitude. cause both these signals have an equal number of 1`s and 0`s.

3. How do the time-domain characteristics of PRBSs differ from those of random data?

- The munber of 1`s and 0`s is virtually equal. The number of 1`s per sequence is exactly one more that the number of 0`s
- The statistical distribution of runs of different lengths is similar to that of random data. Half the runs are of length one. one quarter are of length two, one eighth are of length three, and so on.

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