Methods, systems and devices for communicating between devices within a channel hopping system
In an example embodiment, a device comprises one or more processors and a baseband controller. The one or more processors are configured to: determine, from a payload of at least one received packet, a channel identification (ID) of a notice window in a sequence of transmission windows; transmit, in the notice window, a notice packet that identifies a target window, the target window being later in the sequence of transmission windows than the notice window; generate a target packet that includes inverse whitened data; and transmit the target packet in the target window. The baseband controller is configured to execute signal whitening on the target packet, where the signal whitening of the inverse whitened data in the target packet results in a substantially sinusoidal signal when the target packet is transmitted by the device.
1. A device comprising:
one or more processors configured to:
determine, from a payload of at least one received packet, a channel identification (ID) of a notice window in a sequence of transmission windows;
transmit, in the notice window, a notice packet that identifies a target window, wherein the target window is later than the notice window in the sequence of transmission windows;
generate a target packet that includes inverse whitened data; and
transmit the target packet in the target window; and
a baseband controller configured to execute signal whitening on the target packet, wherein the signal whitening of the inverse whitened data in the target packet results in a substantially sinusoidal signal when the target packet is transmitted by the device.
2. The device of claim 1 , wherein the one or more processors are configured to execute an application that is configured to determine the channel ID of the notice window and to generate the target packet.
3. The device of claim 2 , wherein the application is unaware of a channel hopping sequence for the sequence of transmission windows.
4. The device of claim 2 , wherein the device is a smartphone and the application is an app installed on the smartphone.
5. The device of claim 1 , wherein:
the target packet includes an information portion and a signal portion;
the information portion identifies a frequency of the sinusoidal signal; and
the signal portion is used to generate the sinusoidal signal when the target packet is transmitted.
6. The device of claim 1 , wherein the notice packet includes an event count for the target window.
7. The device of claim 1 , wherein the baseband controller includes a hop selector configured to generate hop sequence information for the sequence of transmission windows.
8. The device of claim 1 , wherein the device is compatible with a Bluetooth (BT) Specification.
9. The device of claim 1 , wherein the device is compatible with a Bluetooth Low Energy (BLE) Specification.
10. The device of claim 1 , wherein the device is one of an automobile key, a gaming controller, and a wireless headphone set.
11. A device comprising:
a plurality of antennas; and
one or more processors configured to:
transmit, in a first window of a sequence of transmission windows, a first packet having a payload that includes a channel ID for a notice window that is later than the first window in the sequence of transmission windows;
receive a notice packet in the notice window;
determine, from the notice packet, a target window in which a target packet will be transmitted, wherein the target window is later than the notice window in the sequence of transmission windows; and
generate direction finding results in response to receiving, at the plurality of antennas, a substantially sinusoidal signal that is generated in response to the target packet being transmitted in the target window.
12. The device of claim 11 , wherein the one or more processors are configured to execute firmware instructions to generate the direction finding results.
13. The device of claim 11 , wherein the device comprises an application which, when executed by the one or more processors, is configured to perform a phase detection operation based on the substantially sinusoidal signal that is received at the plurality of antennas.
14. The device of claim 11 , wherein the device further comprises a baseband controller configured to determine channel IDs for the sequence of transmission windows.
15. The device of claim 14 , wherein the baseband controller includes a hop selector configured to generate hop sequence information for the sequence of transmission windows.
16. The device of claim 11 , wherein the notice packet includes an event count for the target window.
17. The device of claim 11 , wherein the device is compatible with a Bluetooth (BT) Specification.
18. The device of claim 11 , wherein the device is compatible with a Bluetooth Low Energy (BLE) Specification.
19. The device of claim 11 , wherein the device is one of a smartphone and a computer.
20. The device of claim 11 , wherein the device is a locating device disposed in one of an automobile and a shipment package.