Pilot-Less Noise Estimation

摘要

Presented herein are pilot-less noise estimation techniques that utilize a correlation between attributes of a received signal and the noise to generate signal-to-noise ratio (SNR) estimate for the signal. More specifically, an interval of a digital signal is received a log-likelihood ratio (LLR) value is calculated for a plurality of bits in the interval of the signal. A scalar value that relates to a distribution of the calculated LLR values is computed. The SNR for the interval of the signal is determined based on a predetermined correlation between the scalar value and noise within the received interval of the signal.

主权项

1. A method comprising:
receiving a digital signal comprising a plurality of symbols transmitted over a communication channel, wherein the plurality of symbols each have a least significant bit and a second least significant bit; calculating a log-likelihood ratio (LLR) value for a plurality of bits within an interval of the signal by calculating an LLR value for either the least significant bit or the second least significant bit of each of a plurality of symbols in an interval, or for both the least significant bit and the second least significant bit of the plurality of symbols in the interval; computing a scalar value that relates to a statistical distribution of the calculated LLR values; and determining a signal-to-noise ratio (SNR) for the interval of the signal based on a predetermined correlation between the scalar value and noise within the interval of the signal.