US 2011/0299618 A1Published application

Multiple-branch wireless receiver

AssigneeAgere Systems Inc.

InventorsJoachim S. Hammerschmidt, Danilo Manstretta

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Abstract

A wireless receiver detects signals received at two or more antennas, with each antenna coupled to an input receive chain. A switch is employed to couple selected input receive chains to one or more corresponding output receive chains during listening, coarse-detection, and fine-adjustment modes. At least one channel selection filter (CSF) is employed in each output receive chain, and the receiver employs sub-ranging. During idle mode, one antenna's input receive chain is connected to two or more CSFs to detect the packet. When the packet is detected, during a coarse-adjustment mode, the CSFs are reconfigured to couple each antenna's input receive chain to a corresponding output receive chain using low-gain signals. During fine-adjustment mode, the various gains are adjusted to be either high- or low-gain to maintain signals within the dynamic range of the corresponding CSFs.

Claims20

Dependent claims

Apparatus for detecting a data pattern from a plurality of received signals, the apparatus comprising:

two or more radio front ends, each radio front end adapted to generate in parallel first-gain and second-gain output signals from a corresponding one of the plurality of received signals;
two or more channel selection filters (CSFs), each CSF adapted to filter either the first-gain output signal or the second-gain output signal to pass a corresponding information channel signal;
a detector coupled to each of the corresponding ones of the CSFs and adapted to detect a presence of the data pattern;
and
a switch adapted to selectively couple one or more of the first-gain and second-gain output signals of the two or more radio front ends to one or more corresponding CSFs based on the detected presence or absence of the data pattern and the state of each CSF;
wherein:
the switch selectively couples one or more of the first-gain and second-gain output signals of the two or more radio front ends based on an idle mode or an adjustment mode,
the detector is adapted to determine the idle mode or the adjustment mode based on at least one of the detected presence of the data pattern and a state of each CSF, and
the detector comprises at least one of (i) a correlator adapted to detect the data pattern and (ii) a signal level detector adapted to detect the state of the CSF.

6 more elements

A method of detecting data of a packet from a plurality of received signals, the method comprising the steps of:

(a) generating in parallel, during idle mode in a first radio front end, a first-gain output signal and a second-gain output signal from one of the plurality of received signals;
(b) applying a channel selection filter (CSF) to each of the second-gain and first-gain output signals to generate filtered second-gain and first-gain output signals;
and
(c) detecting the presence of a data pattern in at least one of the filtered second-gain and first-gain output signals, wherein, if the presence of the data pattern is detected,
(c1) selecting, as an output from the first radio front end, either the filtered second-gain output signal or the filtered first-gain output signal;
wherein:
substep (c1) comprises selectively coupling one or more of the first-gain and second-gain output signals of the two or more radio front ends based on an idle mode or an adjustment mode, and
step (c) comprises:
determining the idle mode or the adjustment mode based on at least one of the detected presence of the data pattern and a state of each CSF, and
using at least one of (i) a correlator to detect the data pattern and (ii) a signal level detector to detect the state of the CSF.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/211,459Filed 17 Aug 2011
Priority: 17 May 2004
Published: 8 Dec 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H04B 7/08
Using two or more spaced independent antennas: at the receiving station
H03G 3/3078
In bandpass amplifiers or in frequency-changers used in a heterodyne receiver: circuits generating control signals for digitally modulated signals
H04B 7/0619
Of weighted versions of same signal: using feedback from receiving side
H04B
Transmission

Family

Application10/847,431Continuation · filed 17 May 2004
Application12/028,851Continuation · filed 11 Feb 2008
Application13/211,459Continuation
US 2005/0255815 A1Published application
US 2008/0130773 A1Published application
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US 2011/0299618 A1This patent

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