Wireless local area network system and receiver adapted for use thereof and associated method

• US 9,362,976 B2
• Filed: 04/05/2007
• Issued: 06/07/2016
• Est. Priority Date: 04/26/2006
• Status: Active Grant

• Current Assignee: Zebra Technologies Corporation
• Original Assignee: ZIH Corp. (Zebra Technologies Corporation)
• Inventors: Wisherd, David S., Wohl, Michael A.
• Primary Examiner(s): Obayanju, Omoniyi
• Application Number:
  US11/696,744
• Publication Number:
  US 20070280182A1
• Time in Patent Office: 3,351 Days
• Field of Search: 370/338
• US Class Current: 1/1
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes

Abstract

A wireless local area network (WLAN) includes a server and receiver in communication with the server as a network client. A plurality of radio frequency (RF) front-end circuits are each configured for receiving wireless signals from mobile nodes within the WLAN along an allocated channel specific for a front-end circuit. A plurality of baseband processors each specific to an allocated channel are connected to a respective front-end circuit for the allocated channel and capture a desired signal specific to the allocated channel. A system controller is connected to each baseband processor for configuring each baseband processor and processing the desired signal and obtaining message data and signal metrics for each allocated channel that are communicated to the server.

Claims

1. A system comprising:

a server;

a receiver that is part of a wireless network and is in communication with said server as a network client, the receiver comprising;

a plurality of radio frequency (RF) front-end circuits each configured to receive wireless signals from mobile nodes within a wireless network along an allocated channel for each front-end circuit;

a signal waveform detector circuit at each allocated channel configured to detect a signal waveform on the respective allocated channel and generate a trigger waveform indicative of information describing a desired signal to be captured, wherein the signal waveform detector circuit at each allocated channel is further configured to generate the trigger waveform, wherein the trigger waveform is indicative of modulation type, data format, and time-of-arrival (TOA) information of a desired signal to be captured; and

a plurality of processors each specific to an allocated channel and connected to a respective front-end circuit for the allocated channel, each processor being configured to receive a respective trigger waveform and, responsive to the trigger waveform, capture a desired signal specific to the respective allocated channel and acquire time-of-arrival (TOA) information for determining a location based on the captured desired signal, wherein the receiver is further configured to provide the TOA information to the server.

2. The system according to claim 1, and further comprising a media access control (MAC) device connected between said system controller and the server.

3. The system according to claim 1, and further comprising a wireless network connection between said server and said receiver.

4. The system according to claim 1, and further comprising a wired network connection between said server and said receiver.

5. The system according to claim 1, and further comprising diversity antennas connected to the RF front-end circuits and providing spatial diversity.

6. The system according to claim 1, further comprising:

a system controller connected to each processor that configures each respective processor to process the desired signal and obtain message data and signal metrics that are transferred to the system controller to be communicated outbound from the receiver to the server.

7. The system according to claim 6, wherein said system controller is operative for controlling signal selection and RF signal based selection of allocated channels.

8. The system according to claim 7, and further comprising a wireless access point connected to said receiver wherein allocated channels are selected for said wireless access point.

9. The system according to claim 8, and further comprising a multiplexer switch connected between said receiver and said wireless access point for selectively switching signals between said receiver and said wireless access point.

10. A system comprising:

a server;

a receiver that is part of a wireless network and is in communication with said server as a network client, the receiver comprising;

a plurality of radio frequency (RF) front-end circuits each configured to receive wireless signals from mobile nodes within a wireless network along an allocated channel for each front-end circuit;

a signal waveform detector circuit at each allocated channel configured to detect a signal waveform on the respective allocated channel and generate a trigger waveform indicative of information describing a desired signal to be captured, wherein the trigger waveform is indicative of modulation type, data format, and time-of-arrival (TOA) information of a desired signal to be captured;

a plurality of processors each specific to an allocated channel and connected to a respective front-end circuit for the allocated channel, each processor being configured to receive a respective trigger waveform and, responsive to the trigger waveform, capture a desired signal specific to the respective allocated channel and acquire time-of-arrival (TOA) information for determining a location based on the captured desired signal; and

a plurality of TOA processors each specific to a respective allocated channel and RF front-end circuit, each TOA processor being configured to receive TOA information and generate a time stamp for the captured desired signal received in a respective allocated channel, wherein each TOA processor is configured to process TOA information when said receiver is part of a geometric array of networked nodes, determine first-to-arrive signals based on a common network timing signal, and conduct differentiation of the first-to-arrive signals to locate a desired wireless node;

wherein the receiver is further configured to provide the TOA information to the server.

11. A receiver comprising:

a plurality of radio frequency (RF) front-end circuits each configured to receive wireless signals from mobile nodes within a wireless network along an allocated channel for each front-end circuit;

a signal waveform detector circuit at each allocated channel configured to detect a signal waveform on the respective allocated channel and generate a trigger waveform indicative of information describing a desired signal to be captured, wherein the signal waveform detector circuit at each allocated channel is further configured to generate the trigger waveform, wherein the waveform is indicative of modulation type, data format, and time-of-arrival (TOA) information of a desired signal to be captured; and

a plurality of processors each specific to an allocated channel and connected to a respective front-end circuit for the allocated channel, each processor being configured to receive a respective trigger waveform and, responsive to the trigger waveform, capture a desired signal specific to a respective allocated channel and acquire time-of-arrival (TOA) information for determining a location based on the captured desired signal.

12. The receiver according to claim 11, and further comprising a media access control (MAC) device connected between said system controller and a server.

13. The receiver according to claim 11, and further comprising a wireless network connection between a server and said receiver.

14. The receiver according to claim 11, and further comprising a wired network connection between a server and said receiver.

15. The receiver according to claim 11, and further comprising diversity antennas connected to the RF front-end circuits and providing spatial diversity.

16. The receiver according to claim 11, further comprising:

a system controller connected to each processor that configures each respective processor to process the desired signal and obtain message data and signal metrics that are transferred to the system controller to be communicated outbound from the receiver to the server.

17. The receiver of claim 11, wherein at least one of the plurality of processors configured to capture the desired signal is further configured to capture an ISO 24730 formatted signal, a WiFi formatted signal, or a WiFi at baseband formatted signal.

18. The receiver according to claim 16, wherein said system controller is operative for controlling signal selection and RF signal based selection of allocated channels.

19. The receiver according to claim 18, and further comprising a wireless access point connected to said receiver wherein allocated channels are selected for said wireless access point.

20. The receiver according to claim 19, and further comprising a multiplexer switch connected between said receiver and said wireless access point for selectively switching signals between said receiver and wireless access point.

21. A receiver comprising:

a plurality of radio frequency (RF) front-end circuits each configured to receive wireless signals from mobile nodes within a wireless network along an allocated channel for each front-end circuit;

a signal waveform detector circuit at each allocated channel configured to detect a signal waveform on the respective allocated channel and generate a trigger waveform indicative of information describing a desired signal to be captured, wherein the trigger waveform is indicative of modulation type, data format, and time-of-arrival (TOA) information of a desired signal to be captured;

a plurality of processors each specific to an allocated channel and connected to a respective front-end circuit for the allocated channel, each processor being configured to receive a respective trigger waveform and, responsive to the trigger waveform, capture a desired signal specific to a respective allocated channel and acquire time-of-arrival (TOA) information for determining a location based on the captured desired signal; and

a plurality of TOA processors each specific to a respective allocated channel and RF front-end circuit, each TOA processor being configured to receive TOA information and generate a time stamp for the captured desired signal received in an allocated channel, wherein each TOA processor is configured to process TOA information when said receiver is part of a geometric array of networked nodes, determine first-to-arrive signals based on a common network timing signal, and conduct differentiation of the first-to-arrive signals to locate a desired wireless node.

22. A method comprising:

receiving, at a receiver, wireless signals transmitted from mobile nodes within a wireless network along a plurality of allocated channels;

detecting a signal waveform on each of the allocated channels;

generating a trigger waveform indicative of information describing a desired signal to be captured, the waveform being indicative of modulation type, data format, and time-of-arrival (TOA) information of a desired signal to be captured;

receive a respective trigger waveform;

capturing desired signals within each allocated channel in response to receipt of the trigger waveform; and

acquiring time-of-arrival (TOA) information for determining a location based on the captured desired signals.

23. The method according to claim 22, which further comprises:

processing the desired signal within each allocated channel to obtain message data and signal metrics for each allocated channel; and

transmitting the message data and signal metrics to a server.

24. The method according to claim 22, which further comprises receiving TOA information and generating a time stamp for a desired signal.

25. The method according to claim 24, which further comprises processing TOA information and determining a first-to-arrive signal based on a common timing signal and conducting differentiation of the first-to-arrive signals to locate a desired wireless node.

26. The method according to claim 22, which further comprises controlling signal selection into dual RF channels based on RF signal detection.

27. The method according to claim 23, which further comprises transmitting the message data and signal metrics through a wireless access point operative with the receiver or through a media access control (MAC) device connected between the receiver and the server.

28. The method of claim 22, wherein capturing desired signals include capturing an ISO 24730 formatted signal, a WiFi formatted signal, or a WiFi at baseband formatted signal.