|
For Full-Text PDF, please login, if you are a member of IEICE,
or go to Pay Per View on menu list, if you are a nonmember of IEICE.
|
A Channel Estimation Method for a Highly Mobile OFDM Wireless Access System
Ryuhei FUNADA Hiroshi HARADA Yukiyoshi KAMIO Shoji SHINODA
Publication
IEICE TRANSACTIONS on Communications
Vol.E88-B
No.1
pp.282-291 Publication Date: 2005/01/01 Online ISSN:
DOI: 10.1093/ietcom/e88-b.1.282 Print ISSN: 0916-8516 Type of Manuscript: PAPER Category: Wireless Communication Technologies Keyword: OFDM, channel estimation, time-varying fading, IEEE 802.11a,
Full Text: PDF(1.3MB)>>
Summary:
Pilot-symbol-aided (PSA) channel estimation for OFDM wireless access systems enables the periodic estimation of channel frequency response by generating reference data from the received OFDM signals. The accuracy of this channel estimation can be improved through the average over a certain time period in each subcarrier-channel. However, the accuracy of the channel estimates by the average degrades as the Doppler shift is large due to a decrease in the average section size according to the Doppler shift for the tracking of the time-varying channel. This paper proposes a novel PSA channel estimation method to mitigate the influence of the noises and interferences. This method detects the channel estimates affected by the noises and interferences, and then removes them before the arithmetic or harmonic averaging to avoid propagating the influence of the noises and interferences. This paper also evaluated the proposed channel estimation method by clipping log-likelihood ratio (LLR) data to inspect the influence of the channel estimation on the LLR calculation by computer simulation.
|
|
|