US 8,077,646 B1Granted

Equalization in a wireless multiple access communication system

AssigneeMarvell International Ltd.

InventorsRaphael Cendrillon, Robert Ayrapetian

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Abstract

An equalization method and apparatus for a communication system having a first transceiver device that communicates with each of a plurality of second transceiver devices receives a data transmission over a subset of frequency sub-carriers allotted to each second transceiver device. The communication channel between first transceiver device and the plurality of second transceiver devices is partitioned in a plurality of frequency sub-carriers of which the frequency sub-carriers allotted to a second transceiver device is a subset. The data transmission is transformed from a time-domain transmission to a frequency domain transmission. An equalization filter is applied separately to each of the frequency sub-carriers within the subset of frequency sub-carriers.

Claims26

Dependent claims

A method of equalization within a communication system having i) a first transceiver device and ii) a plurality of second transceiver devices, wherein the first transceiver device communicates with each of the second transceiver devices via a subset of frequency sub-carriers allotted to each second transceiver device, the method comprising:

receiving a data transmission over the subset of frequency sub-carriers, wherein the communication channel between first transceiver device and the plurality of second transceiver devices is partitioned in a plurality of frequency sub-carriers of which the frequency sub-carriers allotted to a second transceiver device is a subset;
transforming the data transmission from a time-domain transmission to a frequency domain transmission;
selecting one or more of the frequency sub-carriers within the subset of frequency sub-carriers;
and
applying a separate equalization filter to each of the frequency sub-carriers within the subset of frequency sub-carriers, wherein the equalization filter applied separately to each of the selected frequency sub-carriers comprises a multi-coefficient equalization filter, and wherein the equalization filter for each of unselected frequency sub-carriers comprises a single-coefficient equalization filter.

2 more elements

A method of per-tone equalization in a transceiver of a multi-access communication system, wherein the multi-access communication system comprises a plurality of tones allocated among a plurality of transceivers without overlap and each transceiver communicates among the allocated plurality of tones, the method comprising:

receiving a data transmission over the plurality of tones allocated to the transceiver;
transforming the data transmission from a time-domain transmission to a frequency domain transmission;
and
applying an equalization filter to each tone allocated to the transceiver based on a severity of inter-symbol interference on the data-rate for the tone, wherein applying the equalization filter comprises independently applying an equalization filter to selected ones of the tones allocated to the transceiver based on a difference in data-rate between a data-rate accounting for equalization on the tone and a data-rate that does not account for equalization on the tone.

1 more element

An apparatus for equalizing an orthogonal frequency-division multiple access (OFDMA) signal, the apparatus comprising:

a sliding fast Fourier transform unit adapted to transform a pre-Fourier transform OFDMA signal from the time domain to a post-Fourier transform OFDM signal in the frequency domain;
a per-tone equalizer adapted to apply an equalization filter to each tone allocated to the apparatus by a transmission apparatus, wherein the per-tone equalizer is adapted to apply the equalization filter based on a severity of inter-symbol interference on the data-rate associated with each tone allocated to the apparatus, and wherein the per-tone equalizer is adapted to independently apply an equalization filter to selected ones of the tones allocated to the apparatus based on a difference in data-rate between a data-rate accounting for equalization on the tone and a data-rate that does not account for equalization on the tone.

Dependencies are inferred from the claim text.

Facts

Application: 12/167,911Filed 3 Jul 2008 · us provisional application
Priority: 3 Jul 2007
Granted: 13 Dec 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

H04L 25/03159
Arrangements for removing intersymbol interference: operating in the frequency domain
H04L 5/0007
Time-frequency: the frequencies being orthogonal, e.g. OFDM or DMT
H04L 5/0037
Arrangements for allocating sub-channels of the transmission path: inter-user or inter-terminal allocation
H04L 25/03012
Arrangements for removing intersymbol interference: operating in the time domain