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Cramer-Rao bounds of SNR estimates for BPSK and QPSK modulated signals

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1 Author(s)
N. S. Alagha ; EMS Technol. Canada, STe-Anee-de-Bellevue, Que., Canada

We derive Cramer-Rao lower bounds (CRLBs) for the estimation of signal-to-noise ratio (SNR) of binary phase-shift keying (BPSK) and quaternary phase-shift keying (QPSK) modulated signals. The received signal is corrupted by additive white Gaussian noise (AWGN). The lower bounds are derived for non-data-aided estimation where the transmitted symbols are unknown at the receiver. The bounds are compared to those for data-aided estimations (known symbols at the receiver). It is shown that at low SNR there is a significant difference between the bounds for non-data-aided and data-aided estimations.

Published in:

IEEE Communications Letters  (Volume:5 ,  Issue: 1 )