Performance analysis of snr estimates for awgn and time-selective fading channels

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Title: Performance analysis of snr estimates for awgn and time-selective fading channels
Author: Peksen, Huseyin
Abstract: In this work , first the Cramer -Rao lower bound (CRLB ) of the signal -to -noise ratio (SNR ) estimate for binary phase shift keying (BPSK ) modulated signals in additive white Gaussian noise (AWGN ) channels is derived . All the steps and results of this CRLB derivation are shown in a detailed manner . Two major estimation scenarios are considered herein : the non -data -aided (NDA ) and data -aided (DA ) frameworks , respectively . The non -data -aided scenario does not assume the periodic transmission of known data symbols (pilots ) to limit the system throughput , while the data -aided scenario assumes the transmission of known transmit data symbols or training sequences to estimate the channel parameters . The Cramer -Rao lower bounds for the non -data -aided and data -aided scenarios are derived . In addition , the modified Cramer -Rao lower bound (MCRLB ) is also calculated and compared to the true CRLBs . It is shown that in the low SNR regime the true CRLB is tighter than the MCRLB in the non -data -aided estimation scenario . Second , the Bayesian Cramer -Rao lower bound (BCRLB ) for SNR estimate is considered for BPSK modulated signals in the presence of time -selective fading channels . Only the data -aided scenario is considered , and the time -selective fading channel is modeled by means of a polynomial function . A BCRLB on the variance of the SNR estimate is found and the simulation results are presented .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2342
Date: 2009-05-15

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Performance analysis of snr estimates for awgn and time-selective fading channels. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2342 .

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