How many bits in 16 QAM?
Each symbol in the constellation contains up to 4 bits (0s and 1s) in a 16-QAM scheme. Therefore, the number of combinations that are possible using 4 binary bits is 24 = 16, with each state or symbol containing a value from 0000 to 1111.
What is energy per symbol?
Energy per symbol. This is the total signal power divided by the symbol rate, Rs. Ec. Energy in a single coded bit, or bit into the FEC decoder. Ec is related to Es by the modulation type, specifically the number of coded bits per symbol, k.