US 8,798,176 B2 · Joint time/frequency processing for wireless receivers

Abstract

Channel estimation and/or equalization processing is performed in a wireless receiver in two stages. The first stage involves pre-filtering in the frequency domain to compact a grid-based representation of the net channel. The second stage involves implementing reduced-complexity time domain channel estimation and/or equalization. According to one embodiment, a received signal transmitted over a net channel is processed by pre-filtering the received signal in the frequency domain. The frequency domain pre-filtering compacts an N-tap effective grid-based representation of the net channel into a K-tap compacted grid-based representation of the net channel where K<N. The pre-filtered received signal is equalized in the time domain based on the K-tap compacted grid-based representation of the net channel generated by pre-filtering the received signal in the frequency domain.

Claims18

Dependent claims

A method, in a code-division multiple access (CDMA) receiver, of processing a received signal transmitted over a net channel, comprising:

centering an N-tap effective grid-based representation of the net channel, based on coarse channel information, wherein the grid-based representation is based on a sub-chip spacing interval;
generating pre-filter coefficients based on the centered N-type effective grid-based representation of the net channel, wherein said pre-filter coefficients are designed to compact the centered N-tap effective grid-based representation of the net channel into a K-tap compacted grid-based representation of the net channel, where K<N;
pre-filtering the received signal in the frequency domain, using a frequency-domain representation of the pre-filter coefficients;
and
equalizing the pre-filtered received signal in the time domain, based on the K-tap compacted grid-based representation of the net channel.

2 more elements

A code-division multiple-access (CDMA) wireless receiver, comprising:

a first processing module operable to generate an N-tap effective grid-based representation of a net channel over which a received signal is transmitted, wherein the grid-based representation is based on a sub-chip spacing interval, to generate pre-filter coefficients based on the centered N-type effective grid-based representation of the net channel, wherein said pre-filter coefficients are designed to compact the N-tap effective grid-based representation of the net channel into a K-tap compacted grid-based representation of the net channel, where K<N, and to pre-filter the received signal in the frequency domain, using a frequency-domain representation of the pre-filter coefficients, said first processing module comprising a grid formulation component operable to center the N-tap effective grid-based representation of the net channel, based on coarse channel information;
and
a second processing module operable to equalize the pre-filtered received signal in the time domain, based on the K-tap compacted grid-based representation of the net channel generated by the first processing module.

Dependencies are inferred from the claim text.

Joint time/frequency processing for wireless receivers

Life of this patent

Joint time/frequency processing for wireless receivers

Life of this patent

Abstract

Claims18