METHOD AND APPARATUS FOR DRIVING A CHANNEL IMPULSE RESPONSE ESTIMATE FOR A WIRELESS CHANNEL

摘要

Techniques for deriving a channel impulse response estimate (CERE) having improved quality are described. A first CERE with multiple channel taps is obtained based on (1) an initial CERE derived from a received pilot or (2) a filtered CERE derived from the initial CERE. In one aspect, the channel taps in the first CERE are scaled with multiple scaling factors to obtain a second CERE. For point-wise LMMSE scaling, the energy of each channel tap is estimated. The noise energy for the channel taps is also estimated, e.g., based on energies of channel taps on one or both edges of the first CERE,. Each channel tap is scaled based on a scaling factor determined by the energy of that channel tap and the noise energy. Each channel tap with energy below a threshold may be set to zero. In another aspect, the second CERE is obtained by zeroing out selected ones of the channel taps in the first CERE.