Title :
Cramer-Rao Lower Bound on Frequency Offset Estimation Error in OFDM Systems with Timing Error Feedback Compensation
Author :
Athaudage, C.R.N. ; Sathananthan, K.
Author_Institution :
ARC Special Res. Center for Ultra-Broadband Inf. Networks, Melbourne Univ.
Abstract :
Cyclic-prefix based carrier frequency offset (CFO) estimation techniques (frequency synchronization) are popular for OFDM systems. In the conventional CP-based maximum-likelihood (ML) algorithm, the accuracy of CFO estimation directly depends on the block timing estimation error. Recently, an enhanced frequency offset estimation technique based on ML algorithm was proposed, which incorporates timing error feedback compensation (TEFC). In this paper, we provide a detailed analysis of the Cramer-Rao lower-bound (CRLB) on the CFO estimation error when TEFC in incorporated. A closed form expression is derived for the achievable minimum mean-squared-error (MSE) of CFO. Simulation results show that the analytically derived CRLB is practically reachable for wide range of SNR
Keywords :
OFDM modulation; error compensation; frequency estimation; least mean squares methods; maximum likelihood estimation; CFO estimation error; CRLB; Cramer-Rao lower bound; ML algorithm; MSE; OFDM system; TEFC; carrier frequency offset; cyclic-prefix; maximum likelihood algorithm; minimum mean-squared-error; orthogonal frequency division multiplexing; timing error feedback compensation; AWGN; Digital video broadcasting; Estimation error; Feedback; Frequency estimation; Frequency synchronization; Intersymbol interference; Maximum likelihood estimation; OFDM modulation; Timing;
Conference_Titel :
Information, Communications and Signal Processing, 2005 Fifth International Conference on
Conference_Location :
Bangkok
Print_ISBN :
0-7803-9283-3
DOI :
10.1109/ICICS.2005.1689251