US 11,706,725 B2Granted

Short and long training fields

AssigneeTexas Instruments Incorporated

InventorsTimothy M. Schmidl, Anuj Batra, Srinath Hosur

Life of this patent

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Abstract

A method includes receiving a first plurality of symbols comprising complex portions. The method further includes applying conjugate symmetry to the first plurality of symbols, producing a second plurality of symbols comprising no complex portions. The method further includes transforming the second plurality of symbols using an inverse fast Fourier transform, producing a third plurality of symbols. The method further includes interpolating the third plurality of symbols, generating a short training field comprising at least one real portion of the third plurality of symbols, generating a long training field comprising at least one real portion of the third plurality of symbols, and transmitting the short training field and long training field in a WPAN.

Claims25

Dependent claims

A communication device comprising:

a transmit circuitry;
a receive circuitry;
an antenna coupled to the transmit circuitry and to the receive circuitry, the receive circuitry configured to receive, using the antenna, a first packet having first data symbols;
a processor that includes:
a first set of circuitry configured to process real symbols;
and
a second set of circuitry configured to process complex symbols;
and
a non-transitory machine-readable storage medium comprising executable instructions that, when executed, cause the processor to:
generate, based on the first data symbols, second data symbols comprising no complex portions;
generate, using the first set of circuitry of the processor and without using the second set of circuitry of the processor, a synchronization header based on the second data symbols, wherein the synchronization header includes a short training field (STF) and a long training field (LTF), wherein the STF and the LTF are arranged directly adjacent to one another within the synchronization header;
generate a second packet that includes the synchronization header, a packet header, and a packet payload;
and
cause the transmit circuitry to transmit the second packet over a network using the antenna.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/072,232Filed 16 Oct 2020 · continuation
Priority: 31 Aug 2009
Published: US 2021/0037491 A14 Feb 2021
Granted: 18 Jul 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H04W 56/001
Synchronisation arrangements: synchronization between nodes
H04L 27/2613
Details of reference signals: structure of the reference signals
H04L 27/2634
Modulators: inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for…
H04W 4/80
Services specially adapted for wireless communication networks; Facilities therefor: services using short range communication, e.g. near-field…

Family

Application61/238,445Us provisional application · filed 31 Aug 2009
Application61/287,586Us provisional application · filed 17 Dec 2009
Application12/868,397Parent of this continuation · filed 25 Aug 2010
Application14/025,628Parent of this continuation · filed 12 Sep 2013
US 8,553,730 B2Parent of this continuation · filed 8 Oct 2013
Application16/044,074Parent of this continuation · filed 24 Jul 2018
US 2021/0037491 A1Pre-grant publication · published 4 Feb 2021
US 10,813,064 B2Parent of this continuation
US 10,034,252 B2Parent of this continuation
US 2011/0051747 A1Published application
US 2014/0112330 A1Published application
US 2018/0332550 A1Published application
US 11,706,725 B2This patent

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