Community Forums - Reply To: Spectral efficiency V Signal to noise ratio

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Free Evaluation

April 18, 2016 at 12:26 pm #38190

Rajguru M. Mohan

Participant

Hi Shafeen,
Spectral efficiency depends upon N, the no. of bits per symbol.
SNR also depends upon the energy per bit and noise power spectral density ratio.
But, i don’t think we could plot the above relations directly.
A 16QAM modem has an alphabet size of M = 16 alternative symbols, with N = 4 bit/symbol or bpcu. Since QAM is a form of double sideband passband transmission, the spectral efficiency cannot exceed N = 4 (bit/s)/Hz.
For a signaling alphabet with M alternative symbols, each symbol represents
N = log2 M bits. N is the modulation efficiency measured in bit/symbol or bpcu.
While Eb/N0 (the energy per bit to noise power spectral density ratio)
is an important parameter in digital communication or data transmission.
It is a normalized signal-to-noise ratio (SNR) measure, also known as the “SNR per bit”.

Thanks

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