Methods and Systems for Close Proximity Wireless Communications

• US 20070014409A1
• Filed: 06/23/2006
• Published: 01/18/2007
• Est. Priority Date: 07/15/2005
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Batra, Anuj, Lingam, Srinivas
• Granted Patent: US 8,601,269 B2
• Time in Patent Office: Days
• US Class Current: 380/270
• 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
• 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 system, comprising:

a first device; and

a second device configured to communicate wirelessly with the first device,

wherein the first and second devices selectively reduce an operational range for communications before sharing a secret, the secret related to data encryption.

2. The system of claim 1 wherein the first and second devices communicate using an Ultra Wideband (UWB) protocol.

3. The system of claim 1 wherein the first and second devices communicate using Multi-band Orthogonal Frequency Division Multiplexing.

4. The system of claim 1 wherein the first and second devices selectively extend an operational range for communications after sharing the secret.

5. The system of claim 4 wherein the secret is used to encrypt/decrypt data transferred between the first and second devices.

6. The system of claim 1 wherein the first and second devices selectively reduce an operational range for communications based on logic that bypasses an error correction encoder of the first device and bypasses an error correction decoder of the second device.

7. The system of claim 1 wherein the first and second devices selectively reduce an operational range for communications based on logic that bypasses an interleaver of the first device and bypasses a de-interleaver of the second device.

8. The system of claim 1 wherein the first and second devices selectively reduce an operational range for communications based on logic that inserts random data into zero-pad suffixes to be transmitted.

9. The system of claim 1 wherein the first and second devices selectively reduce an operational range for communications based on logic that decreases a transmission power level.

10. The system of claim 1 wherein the first and second devices selectively reduce an operational range for communications based on logic that increases a coding rate of a convolutional encoder and puncturer.

11. The system of claim 1 wherein the first and second devices selectively reduce an operational range for communications based on logic that decreases the number of tones per bit used for constellation mapping.

12. The system of claim 1 wherein the first and second devices selectively reduce an operational range for communications based on logic that reduces time-domain spreading or frequency-domain spreading.

13. A transmitter, comprising:

close proximity transmission mode logic; and

extended proximity transmission mode logic,

wherein the close proximity transmission mode logic selectively reduces a transmission range before transmitting an encryption key.

14. The transmitter of claim 13 further comprising an error correction encoder, wherein the close proximity transmission mode logic selectively bypasses the error correction encoder during a close proximity transmission mode.

15. The transmitter of claim 13 further comprising an interleaver, wherein the close proximity transmission mode logic selectively bypasses the interleaver during a close proximity transmission mode.

16. The transmitter of claim 13 further comprising Inverse Fast Fourier Transform (IFFT) logic, wherein the close proximity transmission mode logic selectively directs the IFFT logic to insert random data into zero-padded suffixes during a close proximity communication mode.

17. The transmitter of claim 13 further comprising transmission power level logic, wherein the close proximity transmission mode logic selectively directs the transmission power level logic to decrease a transmission power level of the transmitter during a close proximity communication mode.

18. The transmitter of claim 13 further comprising at least one component that affects a data transfer rate, wherein the close proximity transmission mode logic selectively directs at least one of the components to increase a data transfer rate during a close proximity transmission mode.

19. The transmitter of claim 18 wherein the component that affects a data transfer rate is selected from a group of components, the group consisting of,

time domain spreading logic;

frequency-domain spreading logic;

error correction encoder logic;

puncturer logic; and

constellation mapping logic.

20. A receiver, comprising:

close proximity communication mode logic; and

extended proximity communication mode logic,

wherein the close proximity communication mode logic selectively bypasses a receiver component during a close proximity communication mode.

21. The receiver of claim 20 wherein the receiver component comprises an error correction decoder.

22. The receiver of claim 20 wherein the receiver component comprises a de-interleaver.

23. The receiver of claim 20 wherein the close proximity communication mode logic selectively adjusts a performance of a low-noise amplifier (LNA) coupled during the close proximity communication mode.

24. The receiver of claim 20 wherein the close proximity communication mode logic selects between multiple low-noise amplifiers (LNAs) and wherein, during the close proximity communication mode, the LNA with poorest performance is selected.

25. The receiver of claim 20 wherein the close proximity communication mode logic selectively disables overlap-and-add logic of the receiver during the close proximity communication mode.

26. A method, comprising:

reducing an operational range for communications between two devices;

sharing a secret between the two devices while the operational range for communications is reduced.

27. The method of claim 26 further comprising,

extending an operational range for communications between the two devices;

and

using the secret to encrypt/decrypt data transferred between the two devices while the operational range for communications is extended.