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Joint Estimation Schemes of Carrier and Sampling Frequency Offsets for MB-OFDM UWB Systems  

Cho, Chang-Hoon (숭실대학교 정보통신전자공학부)
Yang, Suck-Chel (숭실대학교 정보통신전자공학부)
Shin, Yo-An (숭실대학교 정보통신전자공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.30, no.10C, 2005 , pp. 965-975 More about this Journal
Abstract
In this paper, we propose and evaluate joint carrier and sampling frequency offset estimation schemes based on the channel estimation sequences in PLCP (Physical Layer Convergence Procedure) preamble for the proper and effcient synchronization of the MB-OFDM WB (Multi-Band Orthogonal Frequency Division Multiplexing Ultra Wide Band) systems which have recently drawn explosive attention for future W-PAN (Wireless Personal Area Network) applications. In the joint estimation schemes, we first estimate the sampling frequency offset, and then estimate the carrier frequency offset using the estimated sampling frequency offset. Moreover, to improve the reliability of the estimated offset values, each process uses a combination scheme based on weighting factors. Simulation results using IEEE 802.15 Task Group 3a UWB channel models reveal that the estimation scheme using the simple weighting factors based on easily-measurable received signal power of each sub-channel shows favorably comparable performance to the ideal scheme using the weighting factors based on the perfectly-estimated frequency response of the channel.
Keywords
UWB(Ultra Wide Band); MB-OFDM(Multi-Band Orthogonal Frequency Division Multiplexing); Carrier Frequency Offset; Sampling Frequency Offset; Weighting Factor;
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