Institute of Electrical and Electronics Engineers Inc.;New York, NY: IEEE
摘要:
摘要： In this paper, a novel technique is proposed to address the joint sampling timing acquisition for baseband and broadband power-line communication (BB-PLC) systems using Orthogonal-Frequency-Division-Multiplexing (OFDM), including the sampling phase offset (SPO) and the sampling clock offset (SCO). Under pairwise correlation and joint Gaussian assumption of received signals in frequency domain, an approximated form of the log-likelihood function is derived. Instead of a high complexity two-dimension grid-search on the likelihood function, a five-step method is employed for accurate estimations. Several variants are presented in the same framework with different complexities. Unlike conventional pilot-assisted schemes using the extra phase rotations within one OFDM block, the proposed technique turns to the phase rotations between adjacent OFDM blocks. Analytical expressions of the variances and biases are derived. Extensive simulation results indicate significant performance improvements over conventional schemes. Additionally, effects of several noise models including non-Gaussianity, cyclo-stationarity, and temporal correlation are analyzed and simulated. Robustness of the proposed technique against violation of the joint Gaussian assumption is also verified by simulations. 其他題名： TCOMM 出版者： New York, NY: IEEE 出版日期： 2013-04-01 出處： IEEE transactions on communications, 2013-04, Vol.61 (4), p.1608-1620 資源來源： IEEE Electronic Library (IEL) 版權： 2014 INIST-CNRS 識別號： ISSN: 0090-6778 識別號： DOI: 10.1109/TCOMM.2013.021413.120112 識別號： CODEN: IECMBT
