Methods and systems for close proximity wireless communications

• US 8,601,269 B2
• Filed: 06/23/2006
• Issued: 12/03/2013
• Est. Priority Date: 07/15/2005
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Batra, Anuj, Lingam, Srinivas
• Primary Examiner(s): Rahman, Mahfuzur
• Application Number:
  US11/426,227
• Publication Number:
  US 20070014409A1
• Time in Patent Office: 2,720 Days
• Field of Search: 713/171
• US Class Current: 713/171
• CPC Class Codes: H04B 5/48 Transceivers
• CPC Class Codes: H04K 1/00 Secret communication
• CPC Class Codes: H04L 1/0059 Convolutional codes
• CPC Class Codes: H04L 1/0068 by puncturing
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 2209/34 Encoding or coding, e.g. Huffman coding or error correction
• CPC Class Codes: H04L 2209/80 Wireless network architectures or network communication protocols for wireless network security H04W12/00
• CPC Class Codes: H04L 27/261 Details of reference signals
• CPC Class Codes: H04L 63/0492 by using a location-limited connection, e.g. near-field communication or limited proximity of entities
• CPC Class Codes: H04L 63/061 for key exchange, e.g. in peer-to-peer networks cryptographic mechanisms or cryptographic arrangements for key agreement H04L9/0838
• CPC Class Codes: H04L 9/0838 Key agreement, i.e. key establishment technique in which a shared key is derived by parties as a function of information contributed by, or associated with, each of these network architectures or network communication protocols for key exchange in a packet data network H04L63/061
• CPC Class Codes: H04W 12/50 Secure pairing of devices
• CPC Class Codes: H04W 12/64 using geofenced areas
• CPC Class Codes: H04W 52/28 using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment

Abstract

A system is provided that includes a first device and a second device. The second device is configured to communicate wirelessly with the first device. The first and second devices selectively reduce an operational range for communications before sharing a secret, the secret related to data encryption.

Claims

1. A transmitter comprising:

a physical (“

PHY”

) layer to transmit a wireless signal;

an error correction encoder;

close proximity transmission mode logic to generate a control signal to selectively reduce a transmission range before transmitting an encryption key and to selectively bypass the error correction encoder for a close proximity transmission; and

extended proximity transmission mode logic to configure the transmitter for wireless communication based on a Multi-band orthogonal frequency division multiplexing (OFDM) protocol during an extended proximity communication mode and to generate a control signal to selectively utilize the error correction encoder for an extended proximity transmission.

2. A transmitter comprising:

a physical (“

PHY”

) layer to transmit a wireless signal;

an interleaver;

close proximity transmission mode logic to generate a control signal to selectively reduce a transmission range before transmitting an encryption key and to selectively bypass the interleaver for a close proximity transmission; and

extended proximity transmission mode logic to configure the transmitter for wireless communication based on a Multi-band orthogonal frequency division multiplexing (OFDM) protocol during an extended proximity communication mode and to generate a control signal to selectively utilize the interleaver for an extended proximity transmission.

3. A transmitter comprising:

a physical (“

PHY”

) layer to transmit a wireless signal;

Inverse Fast Fourier Transform (IFFT) logic;

close proximity transmission mode logic to generate a control signal to selectively reduce a transmission range before transmitting an encryption key and to selectively direct the IFFT logic to insert random data into zero-padded suffixes for a close proximity transmission; and

extended proximity transmission mode logic to configure the transmitter for wireless communication based on a Multi-band orthogonal frequency division multiplexing (OFDM) protocol during an extended proximity communication mode and to generate a control signal to selectively direct the IFFT logic to insert zeros into zero-padded suffixes for an extended proximity transmission.

4. A receiver comprising:

a physical (“

PHY”

) layer to receive a wireless signal;

close proximity communication mode logic to generate a control signal to selectively bypass an error correction decoder to receive a close proximity transmission; and

extended proximity communication mode logic to configure the receiver for wireless communication based on a Multi-band orthogonal frequency division multiplexing (OFDM) protocol during an extended proximity communication mode and to generate a control signal to selectively utilize the error correction decoder to receive an extended proximity transmission.

5. A receiver comprising:

a physical (“

PHY”

) layer to receive a wireless signal;

close proximity communication mode logic to generate a control signal to selectively bypass a de-interleaver to receive a close proximity transmission; and

extended proximity communication mode logic to configure the receiver for wireless communication based on a Multi-band orthogonal frequency division multiplexing (OFDM) protocol during an extended proximity communication mode and to generate a control signal to selectively utilize the de-interleaver to receive an extended proximity transmission.

6. A receiver used in a communications channel, said receiver comprising:

a physical (“

PHY”

) layer to receive a wireless signal;

close proximity communication mode logic to generate a control signal to selectively disable an overlap-and-add logic of the receiver to receive a close proximity transmission, wherein the communications channel looks like an impulse; and

extended proximity communication mode logic for configuring the receiver for wireless communication based on a Multi-band orthogonal frequency division multiplexing (OFDM) protocol during an extended proximity communication mode and to generate a control signal to selectively utilize the overlap-and-add logic to receive an extended proximity transmission.