Optimized distribution of wireless broadband in a building

• US 10,098,008 B2
• Filed: 11/15/2017
• Issued: 10/09/2018
• Est. Priority Date: 10/22/2012
• Status: Active Grant

• Current Assignee: CenturyLink Intellectual Property LLC (Lumen Technologies, Inc.)
• Original Assignee: CenturyLink Intellectual Property LLC (Lumen Technologies, Inc.)
• Inventors: Schwengler, Thomas
• Primary Examiner(s): Nowlin, Eric
• Application Number:
  US15/814,024
• Publication Number:
  US 20180077583A1
• Time in Patent Office: 328 Days
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 16/20 for indoor coverage or short range network deployment
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition

Abstract

Methods and systems are disclosed for optimizing the distribution of a broadband wireless signal in a building. The methods and systems include at least one antenna inserted into a building ventilation system and transmitting a wireless broadband training sequence from a transmitter in communication with the antenna. The wireless broadband training sequence will include multiple orthogonal subcarriers. The methods and systems further include detecting the wireless broadband training sequence with a receiver in the building. In selected embodiments, the methods and systems include the steps of analyzing a parameter of the detected wireless broadband training sequence and optimizing a subsequently transmitted wireless broadband signal based at least in part upon the analyzed parameter of the wireless broadband training sequence.

Claims

1. A method of optimizing the distribution of a broadband wireless signal in a building comprising:

inserting at least one antenna into a building ventilation system associated with a building;

transmitting from a single location a wireless broadband training sequence from the at least one antenna in communication with a transmitter, the wireless broadband training sequence comprising multiple orthogonal subcarriers;

detecting the wireless broadband training sequence with a receiver;

analyzing a parameter of the detected wireless broadband training sequence; and

optimizing a subsequently transmitted wireless broadband signal based at least in part upon the analyzed parameter of the wireless broadband training sequence.

2. The method of claim 1 wherein the step of optimizing the wireless broadband signal comprises assigning a subcarrier allocation based at least in part upon the analyzed parameter of the wireless broadband training sequence.

3. The method of claim 2 wherein the assignment of the subcarrier allocation is performed by at least one receiver and is communicated to the transmitter from the at least one receiver.

4. The method of claim 2 wherein the subcarrier allocation is performed by the transmitter.

5. The method of claim 2 further comprising:

estimating a signal propagation characteristic for a modeled transmission line between the at least one antenna and at least one receiver, the modeled transmission line comprising a duct, an opening in the duct and free air between the opening and the at least one receiver; and

optimizing the subsequently transmitted wireless broadband signal based at least in part upon the analyzed parameter of the wireless broadband training sequence and the estimated signal propagation characteristic.

6. The method of claim 5 wherein the estimated signal propagation characteristic comprises an estimate of the coherence bandwidth of the modeled transmission line.

7. The method of claim 6 wherein the coherence bandwidth of the modeled transmission line is estimated by computing a total multipath delay spread from a duct delay spread, an opening delay spread, and a free air delay spread.

8. The method of claim 1 wherein the step of optimizing the wireless broadband signal comprises selecting a subcarrier spacing based at least in part upon the analyzed parameter of the wireless broadband training sequence.

9. The method of claim 1 wherein the step of analyzing a parameter of the wireless broadband training sequence comprises analyzing a parameter of at least one pilot subcarrier of the wireless broadband training sequence.

10. The method of claim 1 wherein the analyzed parameter of the wireless broadband training sequence is a sub-carrier power level.

11. The method of claim 1 wherein the analyzed parameter of the wireless broadband training sequence is a sub-carrier signal to noise ratio.

12. The method of claim 1 further comprising detecting the wireless broadband training sequence with multiple receivers at different physical locations within the building.

13. The method of claim 1 wherein the wireless broadband training sequence comprising multiple orthogonal subcarriers comprises one of an OFDM signal, an OFDMA signal and a SC-FDMA signal.

14. A communications system comprising:

a transmitter of a broadband wireless training sequence comprising multiple orthogonal subcarriers;

a ventilation system within a building, the ventilation system comprising multiple ducts and multiple ventilation openings;

at least one antenna in communication with the transmitter, the at least one antenna being positioned within a duct, the at least one antenna being operative to transmit the wireless broadband training sequence from the transmitter, with transmission occurring from a single location;

at least one receiver located within the building, the receiver being configured to receive the wireless broadband training sequence;

a processor; and

a non-transitory machine-readable medium having encoded thereon a set of instructions executable by the processor to perform one or more operations, the set of instructions comprising;

instructions to analyze a parameter of the wireless broadband training sequence received by the receiver; and

instructions to optimize a subsequently transmitted wireless broadband signal based at least in part upon the analyzed parameter of the wireless broadband training sequence.

15. The communications system of claim 14 wherein the instructions to optimize the wireless broadband signal comprises instructions to assign a subcarrier allocation at least in part upon the analyzed parameter of the wireless broadband training sequence.

16. The communications system of claim 14 further comprising multiple receivers located at physically separated locations within the building.

17. The communications system of claim 14 wherein the instructions to analyze a parameter of the wireless broadband training sequence comprises instructions to analyze a parameter of at least one pilot subcarrier of the wireless broadband training sequence.

18. The communications system of claim 14 wherein the instructions to analyze a parameter of the wireless broadband training sequence comprises instructions to analyze at least one of a sub-carrier power level, and a sub-carrier signal to noise ratio of at least one sub-carrier of the wireless broadband training sequence.

19. The communications system of claim 14 wherein the processor further comprises:

instructions to estimate a signal propagation characteristic for a modeled transmission line between the at least one antenna and at least one receiver, the modeled transmission line comprising a duct, an opening in the duct and free air between the opening and the at least one receiver; and

instructions to optimize the subsequently transmitted wireless broadband signal based at least in part upon the analyzed parameter of the wireless broadband training sequence and the estimated signal propagation characteristic.

20. The communications system of claim 19 wherein the estimated signal propagation characteristic comprises an estimate of the coherence bandwidth of the modeled transmission line.