Signal-to-noise ratio estimation device, system and method based on star map measurement
A technology of signal-to-noise ratio estimation and constellation diagram, applied in the field of signal-to-noise ratio estimation, can solve the problem of high computational complexity, achieve good estimation performance, reduce computational complexity, and reduce the effect of implementation complexity
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[0048] The present invention improves the signal-to-noise ratio estimator based on constellation diagram measurement, and proposes a relatively simple calculation and realization of the signal-to-noise ratio estimator and method. The signal-to-noise ratio estimator includes a constellation diagram demodulator, A constellation diagram measurer and a signal-to-noise ratio estimator; wherein, the constellation demodulator input is from the channel compensator to compensate the received data signal to obtain a compensated signal y n , and for the y n Perform demodulation to obtain an estimate of the transmitted signal output to the constellation measurer; the input y of the constellation measurer n and Measure and compare its Euclidean distance output to the SNR estimator; the SNR estimator judges that the channel is a Gaussian channel or a flat fading channel according to the channel condition, then according to directly estimate the signal-to-noise ratio; and if it is ju...
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