US 8,542,781 B2Granted

Incrementally inclusive frequency domain symbol joint detection

AssigneeTelefonaktiebolaget L M Ericsson (publ)

InventorsYi-Pin Eric Wang, Dennis Hui

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Abstract

In one of its aspects the technology disclosed herein concerns a method of operating a receiver. The method comprises performing symbol detection by (1) receiving a frequency-domain signal that comprises contribution from time-domain symbols transmitted from one or more transmit antennas; (2) generating a transformation matrix and a triangular matrix based on a frequency domain channel response; (3) using the transformation matrix to transform the received frequency-domain signal to obtain a transformed frequency-domain signal; and (4) performing symbol detection by performing plural stages of detection, each stage of detection using elements of the transformed frequency-domain received signal associated with the detection stage.

Claims21

Dependent claims

A method of operating a receiver which receives a signal over a radio interface, comprising of:

(1) receiving, over a radio channel, a frequency-domain signal that comprises contribution from time-domain symbols transmitted from one or more transmit antennas;
(2) generating a transformation matrix and a triangular matrix based on a frequency domain channel response of the radio channel;
(3) using the transformation matrix to transform the received frequency-domain signal to obtain a transformed frequency-domain signal;
(4) performing symbol detection based on the triangular matrix by performing plural detection stages, each detection stage using elements of the transformed frequency-domain signal associated with that detection stage, the plural detection stages comprising:
(4a) in a first detection stage:
forming hypotheses for the first detection stage based on possible modulation values of one of the time-domain symbols,
evaluating detection metrics for all the hypotheses formed for the first detection stage, and
in accordance with the evaluation of the detection metrics, retaining a predetermined number of best hypotheses from the first detection stage,
(4b) in an intermediate detection stage:
jointly detecting a number of time-domain symbols, the detected time-domain symbols including all the time-domain symbols that were jointly detected in an immediately preceding stage and an additional time-domain symbol that was not detected in any previous stages;
forming joint hypotheses for the intermediate stage based on possible modulation values used by the additional time-domain symbol and retained joint hypotheses for the time-domain symbols that were jointly detected in the immediately preceding stage;
evaluating detection metrics for all the hypotheses formed for the intermediate stage, and
in accordance with the evaluation of the detection metrics of said intermediate stage, retaining a predetermined number of best hypotheses from the intermediated stage
(4c) in a last detection stage, jointly detecting all the time-domain symbols.

11 more elements

A receiver comprising:

a plurality of receive antennas configured to receive, over a radio channel, a frequency-domain received signal that comprises contribution from a block of time-domain symbols transmitted from one or more transmit antennas;
electronic circuitry configured to:
generate a transformation matrix and a triangular matrix based on a frequency domain channel response of the radio channel;
transform the received frequency-domain signal to obtain a transformed frequency-domain signal;
perform detection of the time-domain symbols using a multi-stage detection procedure in which each detection stage uses elements of the transformed frequency-domain signal associated with that detection stage and in which the electronic circuitry is configured:
in a first stage, to form hypotheses for the first detection stage based on possible modulation values of one of the time-domain symbols, to evaluate detection metrics for all the hypotheses formed for the first detection stage, and to retain a predetermined number of best hypotheses from the first detection stage;
in an intermediate detection stage, to jointly detect a number of time-domain symbols, the detected time-domain symbols including all the time-domain symbols that were jointly detected in an immediately preceding stage and an additional time-domain symbol that was not detected in any previous stages, to form joint hypotheses for the intermediate stage based on possible modulation values used by the additional time-domain symbol and retained joint hypotheses for the time-domain symbols that were jointly detected in the immediately preceding stage, and to evaluate detection metrics for all the hypotheses formed for the intermediate stage, and retaining a predetermined number of best hypotheses from the intermediated stage;
and
in a last detection stage, to jointly detect all the time-domain symbols.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/050,697Filed 17 Mar 2011 · us provisional application
Priority: 31 Aug 2010
Published: US 2012/0051467 A11 Mar 2012
Granted: 24 Sep 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H04L 25/08
Details ; arrangements for supplying electrical power along data transmission lines: modifications for reducing interference; Modifications for…
H04L 25/03312
Arrangements involving sequence estimation techniques: arrangements specific to the provision of output signals
H04L 25/03331
Arrangements involving sequence estimation techniques: arrangements for the joint estimation of multiple sequences
H04L 25/03012
Arrangements for removing intersymbol interference: operating in the time domain

Family

Application61/378,556Us provisional application · filed 31 Aug 2010
US 2012/0051467 A1Pre-grant publication · published 1 Mar 2012
US 8,542,781 B2This patent

From the US filing history. Foreign family members aren’t listed.

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