Patent ID: 7936810
Filing Date: 2011-05-03
Classification: H04B,H04L

Abstract:
1. A process of frequency-domain equalization in high-speed downlink packet access receivers for wireless channels with large delay-spreads, comprising: A. receiving wireless signals having at least a first and a second set of multipath signals with large delay spreads; B. computing a first set of channel estimates and equalizer weights for the first set of the multipath signals, the computing including computing at least a partial Fourier transform of frequency domain channel estimates that correspond to frequencies at which equalization will be performed; C. computing a second set of channel estimates and equalizer weights for the second set of the multipath signals, the computing including computing at least a partial Fourier transform of frequency domain channel estimates that correspond to frequencies at which equalization will be performed; D. transforming the received wireless signals to frequency domain representations of the received wireless signals with Fourier transforms; E. equalizing the frequency domain representations with the first set of channel estimates and equalizer weights to form first equalized signals; F. equalizing the frequency domain signal representations with the second set of channel estimates and equalizer weights to form second equalized signals; G. inverse Fourier transforming to the time domain the first and second equalized signals; and H. combining the first and the second time domain transformed equalized signals by delaying the first time domain transformed equalized signal by an amount equal to a nearest integer that is less than a difference between a first delay associated with the first set of multipaths and a second delay associated with the second set of multipaths divided by a length of a code sequence used to despread the combined equalized signals.