期刊
WIRELESS PERSONAL COMMUNICATIONS
卷 128, 期 2, 页码 831-853出版社
SPRINGER
DOI: 10.1007/s11277-022-09978-3
关键词
OFDM; CFO; SFO; Hybrid Cramer-Rao bound
This paper develops a hybrid Cramer-Rao bound (HCRB) for estimating carrier frequency offset (CFO) and sampling frequency offset (SFO), and presents necessary identifiability conditions for deterministic parameters. The HCRB is used to assess the performance of existing methods, demonstrating the need for further improvement to achieve higher accuracy.
For the carrier frequency offset (CFO) and sampling (clock) frequency offset (SFO) estimation, the hybrid Cramer-Rao bound (HCRB) is developed when the CFO, SFO, information-bearing symbols are deterministic and channel coefficients are random. Both noise and channel coefficients are complex Gaussian. The HCRB is a lower bound on the mean squared estimation error for any unbiased estimator of a parameter. For the HCRB to be applicable, it is necessary for deterministic parameters to be identifiable (uniquely determined). Some necessary identifiability conditions of some deterministic parameters are found and presented. The HCRB is dependent on the initial time instant. The HCRB is used to assess the performances of some existing methods via simulation. Our results demonstrate that even the best performance is still around 10 dB higher than the HCRB. Further effort is needed to develop more accurate methods.
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