Iterative Sampling Frequency Offset Estimation for MB-OFDM UWB Systems With Long Transmission Packet
| Autor: | Xiaoming Peng, Khiam-Boon Png, Francois Chin, Zhiwei Lin |
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| Rok vydání: | 2012 |
| Předmět: |
Iterative and incremental development
Engineering Computer Networks and Communications Iterative method Estimation theory business.industry Orthogonal frequency-division multiplexing Transmitter Aerospace Engineering Multiplexing Transmission (telecommunications) Automotive Engineering Electronic engineering Electrical and Electronic Engineering business Cramér–Rao bound |
| Zdroj: | IEEE Transactions on Vehicular Technology. 61:1685-1697 |
| ISSN: | 1939-9359 0018-9545 |
| Popis: | A multiband orthogonal frequency-division multiplexing (MB-OFDM) system, which is one of the effective modulation techniques that have been adopted for high-speed ultrawideband (UWB) systems, is very sensitive to sampling frequency offset (SFO) due to the mismatch between local oscillators at the transmitter and the receiver. In this paper, we propose an iterative SFO estimation method for a high-data-rate MB-OFDM UWB system to improve its SFO estimation accuracy in the case of a long transmission packet. The proposed method is an iterative process of 2-D SFO estimation across pilot subcarriers and consecutive OFDM symbols, together with joint channel estimation. Furthermore, we derive the Cramer-Rao lower bound (CRLB) for the proposed SFO estimation method. This CRLB can be used as a guide for algorithm design and to explore the theoretical limit. Our performance analysis and simulation results show that the proposed iterative SFO estimation method is both practical and effective. |
| Databáze: | OpenAIRE |
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