Adaptive time-domain interpolation for OFDM scattered pilot...

Details Adaptive time-domain interpolation for OFDM scattered pilot... Adaptive time-domain interpolation for OFDM scattered pilot...

2011-02-22

2011-02-22

Nguyen, Steven H (Department: 2473)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Fourier transform

C370S342000, C375S260000

Reexamination Certificate

active

07894331

ABSTRACT:
A receiver for use in a pilot-aided OFDM system and a method of performing channel length estimation of a channel in a wireless communication system includes using transmitted and received wireless signals to estimate a channel carrier function vector at continuous and scattered pilot positions of consecutive OFDM symbols; performing time-domain interpolation by (i) upsampling the estimated the channel carrier function vectors at the scattered pilot positions by inserting zeros in between estimated scattered pilot positions, and (ii) filtering the upsampled vectors using a finite impulse response filter comprising a filter bank comprising a plurality of filters; mapping the channel carrier function vector to only one of the filters in the filter bank located in the finite impulse response filter, wherein the mapping causes noise reduction and enhanced channel estimation thereby increasing a maximum Doppler frequency in the channel.

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Chen, Shiou-Hong et al., “Mode Detection, Synchronization, and Channel Estimation for DVB-T OFDM Receiver,” IEEE Global Telecommunications Conference, 2003. GLOBECOM '03, Dec. 1-5, 2003, pp. 2416-2420.

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