Howtosignalprocessing
- What happens in upsampling?
- What are the advantages of upsampling?
- What is the purpose of upsampling?
- Why do we Upsample before pulse shaping?
What happens in upsampling?
Upsampling is the process of inserting zero-valued samples between original samples to increase the sampling rate. (This is sometimes called “zero-stuffing”.) This kind of upsampling adds undesired spectral images to the original signal, which are centered on multiples of the original sampling rate.
What are the advantages of upsampling?
Converting a digital (sampled) signal to a continuous analogue waveform requires interpolation to produce the values between sample points. Doing part of this interpolation digitally (upsampling) simplifies the analogue circuitry and gives better results. That's all there is to it.
What is the purpose of upsampling?
The purpose of Upsampling is to manipulate a signal in order to artificially increase the sampling rate.
Why do we Upsample before pulse shaping?
Pushing the sample rate out by upsampling provides room to shape the spectrum as needed for transmit mask as well as matching. The same thing can be seen in the time domain. Shaping the eye pattern can only be done if there are more than one sample per symbol. That clear up some confusion.
