SYSTEMS AND METHODS FOR CHANNEL PAIRING A TRANSMITTER AND A RECEIVER

• US 20130072122A1
• Filed: 11/14/2012
• Published: 03/21/2013
• Est. Priority Date: 12/11/2008
• Status: Abandoned Application

• Current Assignee: CSR Technology Incorporated (Qualcomm, Inc.)
• Original Assignee: SIRF Technology Incorporated (Qualcomm, Inc.)
• Inventors: Alford, Ronald Clayton, Dubash, Noshir, Schucker, Douglas W.
• Application Number:
  US13/677,144
• Publication Number:
  US 20130072122A1
• Time in Patent Office: Days
• US Class Current: 455/41.2
• CPC Class Codes: H04W 4/80 Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 76/10 Connection setup

Abstract

Systems and methods for channel pairing a transmitter and a receiver are provided. In this regard, a representative method, among others, includes selecting a channel in a radio frequency (RF) band; transmitting a carrier and alert tone on the selected channel in the RF band; responsive to detecting the transmitted carrier and alert tone, demodulating the carrier and alert tone on the selected channel in the RF band and producing the demodulated alert tone; and responsive to detecting the produced alert tone, using the selected channel to establish a wireless link between the transmitter and receiver.

Claims

1. A method for establishing wireless communication with a transmitter, comprising:

transmitting a carrier and alert tone on a channel in a radio frequency (RF) band by the transmitter,

wherein the carrier and alert tone is demodulated on the channel in the RF band, and the demodulated alert tone is produced by an audio generator that is not electrically coupled to the transmitter; and

responsive to detecting the produced alert tone by an audio detector that is electrically coupled to the transmitter, using the channel to establish a wireless communication with the transmitter.

2. The method as defined in claim 1, further comprising:

responsive to not detecting the produced alert tone on the channel, selecting other channels in the RF band and repeating in claim 1 the steps of transmitting, demodulating, producing, and using the selected other channels until the alert tone is detected.

3. The method as defined in claim 2, wherein the step of selecting the other channels in the RF band is achieved by sequentially selecting others channels until the alert tone is detected.

4. The method as defined in claim 1, further comprising:

simultaneously transmitting on multiple channels with respective unique alert tones;

determining whether one of the unique alert tones is detected; and

responsive to detecting one of the unique alert tones on one of the respective multiple channels, using the one channel of the multiple channels associated with the detected unique alert tone to establish the wireless link between the transmitter and receiver.

5. The method as defined in claim 1, further comprising:

transmitting the channel at the maximum RF power allowed, and,

once pairing has been achieved, reducing the maximum RF power of the channel by performing at least one of the following;

reducing the RF power of the channel until the alert tone is no longer detected; and

increasing the RF power of the channel by a predetermined amount to provide a minimum acceptable signal-to-noise ratio wireless link.

6. The method as defined in claim 1, further comprising:

sequentially selecting channels in the RF band;

determining whether each of the sequentially selected channels has low received signal strength indication (RSSI); and

responsive to determining that any of the selected channels have low RSSI, recording the low RSSI channels in an RSSI map of empty channels, wherein the transmitter is a transceiver.

7. The method as defined in claim 6, further comprising selecting one of the low RSSI channels in the RSSI map of empty or unoccupied channels and using the selected low RSSI channel for channel pairing the transceiver and receiver.

8. The method as defined in claim 6, further comprising:

transmitting audio using the channel;

periodically determining whether audio is being transmitted; and

responsive to determining that audio is not being transmitted, selecting one of the low RSSI channel in the RSSI map of empty channels and using the selected low RSSI channel for channel pairing the transceiver and receiver.

9. The method as defined in claim 1, further comprising:

sequentially selecting channels in the RF band;

determining an RSSI level of each of the sequentially selected channels; and

recording the RSSI level of each of the sequentially selected channels in a channel map, wherein the transmitter is a transceiver.

10. The method as defined in claim 9, further comprising:

determining a transmission power level that is a predetermined amount above the recorded RSSI level of each of the sequentially selected channels in the channel map; and

transmitting the carrier and alert tone on any of the sequentially selected channels at the respective determined transmission power level.

11. The method as defined in claim 1, further comprising transmitting the alert tone that is inaudible to a user by performing at least one of the following:

spreading the alert tone across the selected channel bandwidth, resulting in the alert tone to be inaudible to the user; and

modulating the alert tone to be either high or low in frequency to be inaudible to the user.

12. A system for establishing wireless communication with a transmitter comprising:

a transmitter that transmits a carrier and alert tone on a channel in a radio frequency (RF) band; and

a receiver that receives and demodulates the carrier and alert tone, the receiver having an audio generator that produces the demodulated alert tone, the transmitter having an audio detector that detect detects the produced alert tone, responsive to detecting the produced alert tone, the transmitter being configured to use the channel to establish a wireless link between the transmitter and receiver.

13. The system as defined in claim 12, wherein responsive to not detecting the produced alert tone on the channel, the transmitter selects other channels in the RF band and transmits the carrier and the alert tone on the selected other channels, the receiver being configured to receive and demodulate the carrier and alert tone on the selected other channels, the audio generator associated with the receiver being configured to produce the demodulated alert tone on the selected other channels, the audio detector associated with the transmitter being configured to detect the produced alert tone, responsive to detecting the produced alert tone on the selected other channels, the transmitter being configured to use the selected other channels to establish a wireless link between the transmitter and receiver

14. The system as defined in claim 13, wherein the transmitter selects other channels by sequentially selecting other channels until the alert tone is detected.

15. The system as defined in claim 12, wherein the transmitter performs the following:

simultaneously transmit on multiple channels with respective unique alert tones;

determine whether one of the unique alert tones is detected; and

responsive to detecting the one of the unique alert tones on the one of the respective multiple channels, use the one channel of the multiple channels associated with the detected unique alert tone to establish a wireless link between the transmitter and receiver.

16. The system as defined in claim 15, wherein the transmitter determines whether one of the unique alert tones is detected by simultaneously searching for a detected unique alert tone on each channel.

17. The system as defined in claim 12, wherein the transmitter transmits the channel at the maximum RF power allowed and reduces the maximum RF power of the channel by performing at least one of the following:

reduce the RF power of the channel until the alert tone is no longer detected, and increase the RF power of the channel by a predetermined amount to provide a minimum acceptable signal-to-noise ratio wireless link.

18. The system as defined in claim 12, wherein the transmitter is a transceiver, which performs at least one of the following:

sequentially select channels in the RF band;

determine whether each of the sequentially selected channels has low RSSI; and

responsive to determining that any of the sequentially selected channels have low RSSI, record the low RSSI channels in an RSSI map of empty channels.

19. The system as defined in claim 18, wherein the transceiver selects one of the low RSSI channels in the RSSI map of empty channels and uses the selected low RSSI channel for channel pairing the transceiver and the receiver.

20. The system as defined in claim 18, wherein the transceiver further performs the at least one of the following:

transmit audio using the channel;

periodically determine whether audio is being transmitted; and

responsive to determining that audio is not being transmitted, select one of the low RSSI channels in the RSSI map of empty channels and use the selected low RSSI channel for channel pairing the transceiver and receiver.

21. The system as defined in claim 12, wherein the transmitter is a transceiver, which performs at least one of the following:

sequentially select channels in the RF band;

determine a RSSI level of each of the selected channels; and

record the RSSI level of each of the sequentially selected channels in a channel map.

22. The system as defined in claim 21, wherein the transceiver determines a transmission power level that is a predetermined amount above the recorded RSSI level of each of the sequentially selected channels in the channel map and transmits the carrier and alert tone on any of the sequentially selected channels at the respective determined transmission power level.

23. The system as defined in claim 12, wherein the transmitter transmits the alert tone that is inaudible to a user by performing at least one of the following:

spread the alert tone across the selected channel bandwidth, resulting in the alert tone to be inaudible to the user; and

modulate the alert tone to be either high or low in frequency to be inaudible to the user.

24. A system for establishing wireless communication between a transmitter and a receiver comprising:

a transmitter that transmits on a channel in a radio frequency (RF) band; and

a receiver that receives and demodulate the carrier and alert tone, the receiver having an audio generator that produces the demodulated alert tone, the transmitter having an audio detector that is configure to detect the produced alert tone on the channel, responsive to detecting the produced alert tone on the channel, the transmitter uses the channel to establish a wireless link between the transmitter and receiver, responsive to not detecting the produced alert tone, the transmitter being configured to sequentially select other channels whereby the transmitter and receiver being configured to repeat the above mentioned functionalities until the alert tone is detected and a wireless link is established between transmitter and receiver.