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Indoor radio ranging based on a subset of subcarriers employed by OFDM

一种多路复用、正交频分的技术，应用在无线电波测量系统、无线电波的反射/再辐射、无线通信等方向，能够解决低不确定性、不确定性程度保持、高度不确定性等问题

Inactive Publication Date: 2015-06-17
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

RSSI measurements can be used for ranging; however, the resulting distance has a high degree of uncertainty of 50 to 100 feet
RTT measurements provide a low degree of uncertainty; however, the uncertainty may still be 10 to 50 feet
By estimating the distance to three or more APs, a mobile station can use trilateration to estimate its position but the degree of uncertainty remains

Method used

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  • Indoor radio ranging based on a subset of subcarriers employed by OFDM
  • Indoor radio ranging based on a subset of subcarriers employed by OFDM
  • Indoor radio ranging based on a subset of subcarriers employed by OFDM

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Embodiment Construction

[0033] The detailed description set forth below in conjunction with the accompanying drawings is intended as a description of various aspects of the invention and is not intended to represent the only aspects in which the invention may be practiced. Each aspect described in the present invention is provided merely as an example or illustration of the invention, and should not necessarily be construed as preferred or advantageous over other aspects. The detailed description contains specific details for the purpose of providing a thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the invention. Acronyms and other descriptive terms may be used for convenience and clarity only and are not intended to limit the scope of the invention...

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Abstract

Systems, apparatus and methods for determining a set of ranges from selected subcarriers of an OFDM signal sent between a receiver (e.g., first transceiver or a local receiver of a local unit at a first location) and a transmitter (e.g., second transceiver or remote transmitter of a remote unit at a second location) are presented. The set of ranges is ambiguous as to the correct range. Each range in this set of ambiguous ranges represents a possible range between the transmitter and the receiver. Range ambiguities may be resolved by using additional subcarriers from the OFDM signal and / or using a last know position of a receiver and / or finding ranges to two, three or more transmitters. The range may be used with other ranges to find a location estimate of the receiver.

Description

[0001] Cross References to Related Applications [0002] This application claims an application filed on October 19, 2012 and entitled "Indoor radio ranging based on a subset of subcarriers for Orthogonal Frequency Division Multiplexing (OFDM)" subcarriers employed by orthogonal frequency division multiplexing (OFDM)), which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates generally to systems, devices and methods for wireless position estimation, and more particularly to indoor ranging based on autocorrelation of subsets of OFDM subcarriers. Background technique [0004] A mobile station can use GPS to obtain its current location and provide a good fix. However, indoors, GPS signals are blocked and a good GPS fix is ​​unreliable or impossible. The mobile station can switch to internal sensors (eg, from accelerometers, gyrometers, and magnetometers) to determine how far and in which direction the mobile station ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W64/00
CPCG01S5/14G01S11/08G01S13/876G01S13/878H04L27/2663H04L27/2672
Inventor 佩尔·恩格利昂内尔·雅克·加兰
Owner QUALCOMM INC
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