Uplink channel estimation system for orthogonal frequency...

Details Uplink channel estimation system for orthogonal frequency... Uplink channel estimation system for orthogonal frequency...

2004-10-20

2008-09-23

Payne, David C. (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

Reexamination Certificate

active

07428267

ABSTRACT:
In the uplink of an OFDMA system, a preamble is used to estimate a channel and then the pilot tones of a data symbol are used for channel estimation to update the channel estimate. The channel estimate is used for channel compensation, and the phase of the channel is corrected using the channel estimate obtained from the pilot tones. In this way, the channel estimation performance and hence the compensation ability can be enhanced.

REFERENCES:
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Larsson, E.G.; Guoqing Liu; Jian Li; Giannakis, G.B.; Joint symbol timing and channel estimation for OFDM based WLANs; IEEE Communications Letters, vol. 5, Issue 8, Aug. 2001 pp. 325-327.
IEEE 2002, “Robust channel estimation in Wireless LANs for Mobile Environments,” Sep. 2002, pp. 24-28.
“Channel Estimation For OFDM Systems Based on Comb-Type Pilot Arrangement in Frequency Selective Fading Channels”, M. Hsieh, et al., 1998 IEEE, Jan. 13, 1998, pp. 217-225.

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