Methods and apparatuses for improving quality of positioning
First Claim
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1. A method of determining a range between two stations, comprising:
- receiving a message at a first station, wherein the message comprises at least a short training field and a long training field received from a second station;
detecting a transition from the short training field to the long training field, comprising monitoring a window of impulse responses of the message received, generating a normalized energy level of the window of impulse responses with respect to time using the message received, and identifying the transition from the short training field to the long training field based, at least in part, on;
a slope of the normalized energy level exceeding a predetermined threshold of the slope of the normalized energy level;
determining a first arrival correction time based at least in part on the transition from the short training field to the long training field; and
assisting the second station to determine a range of the second station in accordance with the first arrival correction time.
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Abstract
Methods and apparatuses of improving quality of positioning are disclosed. According to aspects of the present disclosure, a transition from a short training field to a long training field in one or more communication messages between two wireless stations may be detected. A station may then determine a first arrival correction time based on the transition from the short training field and the long training field. With the first arrival correction time, more accurate timing of communications between the two wireless stations may be determined and used for improving quality of positioning applications.
27 Citations
26 Claims
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1. A method of determining a range between two stations, comprising:
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receiving a message at a first station, wherein the message comprises at least a short training field and a long training field received from a second station; detecting a transition from the short training field to the long training field, comprising monitoring a window of impulse responses of the message received, generating a normalized energy level of the window of impulse responses with respect to time using the message received, and identifying the transition from the short training field to the long training field based, at least in part, on; a slope of the normalized energy level exceeding a predetermined threshold of the slope of the normalized energy level; determining a first arrival correction time based at least in part on the transition from the short training field to the long training field; and assisting the second station to determine a range of the second station in accordance with the first arrival correction time. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A computer program product comprising a non-transitory medium storing instructions for execution by one or more computer systems, the instructions comprising:
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instructions for receiving a message at a first station, wherein the message comprises at least a short training field and a long training field received from a second station; instructions for detecting a transition from the short training field to the long training field, comprising instructions for monitoring a window of impulse responses of the message received, instructions for generating a normalized energy level of the window of impulse responses with respect to time using the message received, and instructions for identifying the transition from the short training field to the long training field based, at least in part, on; a slope of the normalized energy level exceeding a predetermined threshold of the slope of the normalized energy level; instructions for determining a first arrival correction time based at least in part on the transition from the short training field to the long training field; and instructions for assisting the second station to determine a range of the second station in accordance with the first arrival correction time. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A device, comprising:
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a transceiver configured to receive a message at the device, wherein the message comprises at least a short training field and a long training field received from a second station; one or more processors or digital signal processors or combination thereof configured to detect a transition from the short training field to the long training field, comprising monitor a window of impulse responses of the message received, generate a normalized energy level of the window of impulse responses with respect to time using the message received, and identify the transition from the short training field to the long training field based, at least in part, on; a slope of the normalized energy level exceeding a predetermined threshold of the slope of the normalized energy level; determine a first arrival correction time based at least in part on the transition from the short training field to the long training field; and assist the second station to determine a range of the second station in accordance with the first arrival correction time. - View Dependent Claims (16, 17, 18, 19, 20)
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21. An apparatus, comprising:
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means for receiving a message at the apparatus, wherein the message comprises at least a short training field and a long training field received from a second station; means for detecting a transition from the short training field to the long training field, comprising means for monitoring a window of impulse responses of the message received, means for generating a normalized energy level of the window of impulse responses with respect to time using the message received, and means for identifying the transition from the short training field to the long training field based, at least in part, on; a slope of the normalized energy level exceeding a predetermined threshold of the slope of the normalized energy level; means for determining a first arrival correction time based at least in part on the transition from the short training field to the long training field; and means for assisting the second station to determine a range of the second station in accordance with the first arrival correction time. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification