Patent ID: 9143286
Filing Date: 2015-09-22
Classification: H04B,H04L

Abstract:
1. A method for estimating signal-to-noise ratio in an orthogonal frequency division multiplexing radio frequency receiver, the method comprising: receiving a radio frequency transmitted signal having a signal bandwidth and a noise bandwidth that is wider than the signal bandwidth, the radio frequency transmitted signal comprising multiple sub-carriers, the multiple sub-carriers comprising a plurality of noise only sub-carriers within the noise bandwidth but outside the signal bandwidth and a plurality of signal plus noise sub-carriers within the signal bandwidth; demodulating the radio frequency transmitted signal; sampling the demodulated radio frequency transmitted signal to produce a series of digital samples; transforming a digital signal, based on the series of digital samples, to a frequency domain; in the frequency domain, estimating power of each of the multiple sub-carriers; calculating a noise to noise ratio of noise in the noise only sub-carriers and noise in the signal plus noise sub-carriers, based on the estimated power of each of the noise only sub-carriers and based on the estimated power of each of the signal plus noise sub-carriers; and calculating a signal to noise ratio, based on the noise to noise ratio.