about Local Oscillator block

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Owen 2012-10-18

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评论： Sree Vamsi 2019-3-12

Hi,

In the “Local Oscillator” block there are two parameters “Sample time” and “Frequency”. Must these two be related to Nyquist theory? That, 1/Sample time > 2 * Frequency.

Thanks Senmeis

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Sree Vamsi 2019-3-12

where can i find the local oscillator block ???

i need it for my receiver design.

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Answer 1

Azzi Abdelmalek 2012-10-18

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The frequency is the repetition of your signal
The sample time is the interval of time between two values of your signal

both have nothing to do with Nyquist theorem. The sample time must be chosen respecting Shanon theorem

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Azzi Abdelmalek 2012-10-26

编辑：Azzi Abdelmalek 2012-10-26

That depends on what are you sampling, a signal or a system, And what are your objectives: control system, communication,...

If you want to make a discret control system, you must discretize your models with a sample time ts, that means all the signals must be sampled with ts.In this case ts choosen compared to the constant time of the output we want to control

Also if our signal is naturaly discret, Shanon theorem has nothing to do with it

Owen 2012-10-30