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US 2015/0312707 A1Published application
Methods and apparatus for improving acquisition for nfc load modulation
AssigneeQUALCOMM Incorporated
InventorsLe Nguyen Luong, RaviKiran Gopalan, Koorosh Akhavan
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Abstract
Aspects disclosed herein relate to improving acquisition for NFC load modulation. In one example, a communications device is equipped to monitor at least a complex component of load modulation of a carrier signal, detect, using a NFC technology type specific peak detection scheme, a peak associated with at least the complex component, and determine a presence of a packet beginning pattern based on the detected peak. In an aspect, the packet beginning pattern may be associated with a reception of a packet from a target NFC device.
Claims14
An apparatus for communication, comprising:
- means for monitoring, by an initiator near-field communication (NFC) device using NFC-type A, at least a complex component of load modulation of a carrier signal;
- means for detecting a plurality of local peaks above a threshold magnitude associated with at least the complex component;
- means for determining whether a peak of the plurality of local peaks has a magnitude, or magnitude squared, greater than a fraction of a sum of magnitude, or magnitude squared, of a Nth future local peak and a magnitude, or magnitude squared, of a (N+K)th future local peak;
- and
- means for determining a presence of a packet-beginning pattern based on the detected plurality of local peaks, wherein the packet-beginning pattern is associated with a reception of a packet from a target NFC device.
2 more elements
An apparatus for communication, comprising:
- means for monitoring, by an initiator near-field communication (NFC) device using NFC-type A, at least a complex component of load modulation of a carrier signal;
- means for detecting a plurality of local peaks above a threshold magnitude associated with at least the complex component;
- means for determining whether a peak of the plurality of local peaks has a magnitude, or magnitude squared, greater than a magnitude, or magnitude squared, of any of a future set of N local peaks;
- and
- means for determining a presence of a packet-beginning pattern based on the detected plurality of local peaks, wherein the packet-beginning pattern is associated with a reception of a packet from a target NFC device.
2 more elements
An apparatus for communication, comprising:
- means for monitoring, by an initiator near-field communication (NFC) device using NFC-type F, at least a complex component of load modulation of a carrier signal;
- means for detecting a peak associated with at least the complex component, said means for detecting comprising:
- means for detecting a first peak using a binary matched filter and an associated threshold,
- means for detecting a second peak using a matched filter, said detecting by the matched filter being triggered by the detecting of the first peak by the binary matched filter;
- and
- means for determining a presence of a packet-beginning pattern based on the detected first and second peaks, wherein the packet-beginning pattern is associated with a reception of a packet from a target NFC device.
3 more elements
An apparatus for communication, comprising:
- means for monitoring, by an initiator near-field communication (NFC) device using NFC-type B, at least a complex component of load modulation of a carrier signal;
- means for detecting a plurality of local peaks above a threshold magnitude associated with at least the complex component;
- means for determining whether a peak of the plurality of local peaks has a magnitude, or magnitude squared, greater than a sum of magnitude, or magnitude squared, of a Nth future local peak and a magnitude, or magnitude squared, of a (N+K)th future local peak;
- and
- means for determining a presence of a packet-beginning pattern based on the detected plurality of local peaks, wherein the packet-beginning pattern is associated with a reception of a packet from a target NFC device.
2 more elements
An apparatus for communication, comprising:
- means for monitoring, by an initiator near-field communication (NFC) device using NFC-type Vicinity, at least a complex component of load modulation of a carrier signal;
- means for detecting a plurality of local peaks above a threshold magnitude associated with at least the complex component;
- means for determining whether a peak of the plurality of local peaks has a magnitude or magnitude squared greater than a magnitude, or magnitude squared, of any of a future set of N local peaks;
- and
- means for determining a presence of a packet-beginning pattern based on the detected plurality of local peaks, wherein the packet-beginning pattern is associated with a reception of a packet from a target NFC device.
2 more elements
A non-transitory computer-readable medium storing computer-executable code for communication comprising:
- code for monitoring, by an initiator near-field communication (NFC) device using NFC-type A, at least a complex component of load modulation of a carrier signal;
- code for detecting a plurality of local peaks above a threshold magnitude associated with at least the complex component;
- code for determining whether a peak of the plurality of local peaks has a magnitude, or magnitude squared, greater than a fraction of a sum of magnitude, or magnitude squared, of a Nth future local peak and a magnitude, or magnitude squared, of a (N+K)th future local peak;
- and
- code for determining a presence of a packet-beginning pattern based on the detected plurality of local peaks, wherein the packet-beginning pattern is associated with a reception of a packet from a target NFC device.
2 more elements
A non-transitory computer-readable medium storing computer-executable code for communication, comprising:
- code for monitoring, by an initiator near-field communication (NFC) device using NFC-type A, at least a complex component of load modulation of a carrier signal;
- code for detecting a plurality of local peaks above a threshold magnitude associated with at least the complex component;
- code for determining whether a peak of the plurality of local peaks has a magnitude, or magnitude squared, greater than a magnitude, or magnitude squared, of any of a future set of N local peaks;
- and
- code for determining a presence of a packet-beginning pattern based on the detected plurality of local peaks, wherein the packet-beginning pattern is associated with a reception of a packet from a target NFC device.
2 more elements
A non-transitory computer-readable medium storing computer-executable code for communication, comprising:
- code for monitoring, by an initiator near-field communication (NFC) device using NFC-type F, at least a complex component of load modulation of a carrier signal;
- code for detecting a peak associated with at least the complex component, said code for detecting comprising:
- code for detecting a first peak using a binary matched filter and an associated threshold,
- code for detecting a second peak using a matched filter, said detecting by the matched filter being triggered by the detecting of the first peak by the binary matched filter;
- and
- code for determining a presence of a packet-beginning pattern based on the detected first and second peaks, wherein the packet-beginning pattern is associated with a reception of a packet from a target NFC device.
3 more elements
A non-transitory computer-readable medium storing computer-executable code for communication, comprising:
- code for monitoring, by an initiator near-field communication (NFC) device using NFC-type B, at least a complex component of load modulation of a carrier signal;
- code for detecting a plurality of local peaks above a threshold magnitude associated with at least the complex component;
- code for determining whether a peak of the plurality of local peaks has a magnitude, or magnitude squared, greater than a sum of magnitude, or magnitude squared, of a Nth future local peak and a magnitude, or magnitude squared, of a (N+K)th future local peak;
- and
- code for determining a presence of a packet-beginning pattern based on the detected plurality of local peaks, wherein the packet-beginning pattern is associated with a reception of a packet from a target NFC device.
2 more elements
A non-transitory computer-readable medium storing computer-executable code for communication, comprising:
- code for monitoring, by an initiator near-field communication (NFC) device using NFC-type Vicinity, at least a complex component of load modulation of a carrier signal;
- code for detecting a plurality of local peaks above a threshold magnitude associated with at least the complex component;
- code for determining whether a peak of the plurality of local peaks has a magnitude or magnitude squared greater than a magnitude, or magnitude squared, of any of a future set of N local peaks;
- and
- code for determining a presence of a packet-beginning pattern based on the detected plurality of local peaks, wherein the packet-beginning pattern is associated with a reception of a packet from a target NFC device.
2 more elements
Dependencies are inferred from the claim text.