Asymptotic bounds for frequency estimation in the presence of multiplicative noise
EURASIP Journal on Applied Signal Processing
An average Cramer-Rao bound for frequency offset estimation in frequency-selective fading channels
IEEE Transactions on Wireless Communications
Space-time Doppler spread estimation in mobile fading channels
MILCOM'06 Proceedings of the 2006 IEEE conference on Military communications
Blind estimation of the phase and carrier frequency offsets for LDPC-coded systems
EURASIP Journal on Advances in Signal Processing
Hi-index | 35.68 |
We are concerned with the estimation of the frequency of a complex sinusoid that has been corrupted by complex-valued multiplicative and additive noise. This problem is important in many applications including array processing in the case of spatially distributed sources and synchronization in the context of time-selective channels. The multiplicative noise smears the spectral line due to the sinusoid. This smearing, which is often called Doppler spreading, may significantly degrade the estimation accuracy. The goal of this paper is to analytically assess this degradation. The finite-sample Cramer-Rao bounds (CRBs) are derived, and closed-form expressions are given for the large-sample CRB. The latter gives insights into the effective coherent and noncoherent SNRs for frequency estimation. We then analyze the accuracy of frequency estimators that are based on the angles of the sample covariances. Simulations results are presented to illustrate the theoretical results