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A Initial Channel Estimation Method Based on Extensive Preamble Utilization in MB-OFDM UWB System  

Jeong, Jin-Doo (Hanyang University)
Jin, Yong-Sun (Kookje University)
Chong, Jong-Wha (Hanyang University)
Publication Information
전자공학회논문지 IE / v.48, no.1, 2011 , pp. 30-35 More about this Journal
Abstract
In this paper, we propose a method to improve the performance of initial channel estimation (CE) for the multiband-OFDM (MB-OFDM) UWB. The performance of the initial CE can be generally improved as increasing the number of the used preamble symbols. The MB-OFDM specification presents two CE symbols per band in preamble format. The performance of CE estimation with two CE symbols may be satisfied in relatively high sensitivity -77.5 and -72.5 dBm for 200 Mbps and 480 Mbps data rate, respectively, but can not be enough in the degraded 55 Mbps and 110 Mbps sensitivities such as -83.5 and -80.5 dBm, respectively. A method proposed in this paper achieves the performance improvement by extending CE estimation region to packet synchronization (PS) symbols and frame synchronization (FS) symbols including two CE symbols. This can improve the CE performance in the degraded SNR and increase the link-margin by reducing the error rate in physical-layer header. The link-margin improvement obtained by the proposed CE preamble can induce the decrease of error-rate in physical-layer header and increase of communication throughput. Simulation results for the proposed initial method show that the performance is improved by about 0.7 dB at 10-4 bit-error-rate using '4' symbols than initial method using only two CE symbols.
Keywords
UWB; MB-OFDM; UWB; Initial Channel Estimation; Extensive Preamble Utilization;
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Times Cited By KSCI : 1  (Citation Analysis)
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