What is the purpose of the windowing function?
A window function is an SQL function where the input values are taken from a “window” of one or more rows in the results set of a SELECT statement. Window functions are distinguished from other SQL functions by the presence of an OVER clause. If a function has an OVER clause, then it is a window function.
What is windowing process?
Windowing is the process of taking a small subset of a larger dataset, for processing and analysis. A naive approach, the rectangular window, involves simply truncating the dataset before and after the window, while not modifying the contents of the window at all.
What is the purpose of pulse shaping in electronics?
Pulse shaping. In electronics and telecommunications, pulse shaping is the process of changing the waveform of transmitted pulses. Its purpose is to make the transmitted signal better suited to its purpose or the communication channel, typically by limiting the effective bandwidth of the transmission.
Why is pulse shaping important in RF communication?
By filtering the transmitted pulses this way, the intersymbol interference caused by the channel can be kept in control. In RF communication, pulse shaping is essential for making the signal fit in its frequency band. Typically pulse shaping occurs after line coding and modulation .
How does pulse shaping make the spectrum smooth?
This pulse shaping will make the spectrum smooth, leading to a time limited signal again. Usually the transmitted symbols are represented as a time sequence of dirac delta pulses multiplied with the symbol. This is the formal transition from the digital to the analog domain. At this point, the bandwidth of the signal is unlimited.
Is it a waste of bandwidth to use pulse shaping?
Lacoste’s article serves as solid introduction to the broad subject of pulse-shaping. And it concludes by re-emphasizing a few important points and additional resources for readers: Transmitting a raw digital signal on any medium is a waste of bandwidth. A filter can drastically improve the performance.