re: Optical Alphabet Soup They were all invented in the 50s and have been around a long time in MODEMs (which depending on which type of MODEM you have has one or more of the modes in it).
At the end of the day, there is really only two questions that need to be asked about a modulation scheme:
1 - How immune to various types of noise sources is it 2 - How much does it cost to implement?
The former will tell you how many bits per symbol you CAN send across a connection. The latter will tell you how many bits per symbol you CAN AFFORD to send across a connection.
The answers to question 1 is well studied for all of these modulation methods, IFF (if and only if) one can describe the noise models. So, if that can be managed then the "best" modulation scheme is a factual piece of information (i.e. it comes from Physics).
The cost of various schemes is much more debatable and involves funny vendor math.
re: Optical Alphabet Soupalthough it sounds exactly like the optical duobinary (ODB!!). How many are referrring to the same exact thing is the best question.
They were all invented in the 50s and have been around a long time in MODEMs (which depending on which type of MODEM you have has one or more of the modes in it).
At the end of the day, there is really only two questions that need to be asked about a modulation scheme:
1 - How immune to various types of noise sources is it
2 - How much does it cost to implement?
The former will tell you how many bits per symbol you CAN send across a connection. The latter will tell you how many bits per symbol you CAN AFFORD to send across a connection.
The answers to question 1 is well studied for all of these modulation methods, IFF (if and only if) one can describe the noise models. So, if that can be managed then the "best" modulation scheme is a factual piece of information (i.e. it comes from Physics).
The cost of various schemes is much more debatable and involves funny vendor math.
Hope this helps.
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