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* For reliable and effective communication over long distance i.e. minimizing the signal losses during transmission.
* As signal band is limited (from few MHz to maybe some GHz) we have to use as low bandwidth of signal as low as possible. (i.e. maximizing the use of bandwidth allocated) <br \><br \><br \>
== How to decide type of Modulation? ==
Basically selection of modulation technique comes from your requirements and constraints. There are many parameters that we have to look into, some are mentioned below:
* Transmission Rate required/ [https://en.wikipedia.org/wiki/Spectral_efficiency Spectral efficiency]
* Acceptable [https://en.wikipedia.org/wiki/Bit_error_rate Bit error rate (BER)]
* Hardware availability / Complexity at reception side (if we want most people to receive our signal, we'll use a popular modulation, like [https://en.wikipedia.org/wiki/Continuous_wave Continuous Wave])
* Bandwidth available
== Some Pros and Cons of General Modulation Schemes ==
If you are done reading this page, you can go back to [[Communications Subsystem]]