OFDM position location signaling utilizing mutually exclusive subsets of subcarriers

A technology for positioning signals and subsets, which is applied in the field of signaling and devices, and wireless position positioning systems, and can solve problems such as low cross-correlation, increased complexity, bandwidth time, and signal power with large differences

Inactive Publication Date: 2007-10-03
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, using long PN codes will increase the complexity, bandwidth or time required to obtain a position fix
Also, since mobile stations within land-based systems can receive widely varying signal powers, even relatively low cross-correlation can interfere with a mobile station's ability to identify the source of the signal

Method used

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  • OFDM position location signaling utilizing mutually exclusive subsets of subcarriers
  • OFDM position location signaling utilizing mutually exclusive subsets of subcarriers
  • OFDM position location signaling utilizing mutually exclusive subsets of subcarriers

Examples

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[0075] In a typical wideband broadcast system embodiment, Q = 4096 orthogonal carriers may be defined within a 5.5MHz frequency span, which just fits within a commonly allocated 6MHz TV broadcast channel. This allocation of carriers results in a carrier spacing of approximately 1.343 kHz.

[0076] If M=8 different position location signals are configured, each position location signal includes a subset with Q / M or 512 carriers. Each position location beacon 120 may be assigned one of the 8 carrier subsets.

[0077] The quadrature signal generator 310 can be configured to generate at least 512 quadrature carriers required for a position location signal. The 512 quadrature carriers are then provided to the modulator 320 input. Modulated data module 324 is configured to provide a pseudo-random binary sequence to modulator 320, such as a golden code extended to 512 bits in length if desired (the full length of the golden code is 2n−1, where n is an integer, such as when n= 9 o'...

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PUM

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Abstract

Position location signaling system, apparatus, and method are disclosed. Position location beacons can each be configured to transmit a frequency interlaced subset of orthogonal frequencies spanning substantially an entire channel bandwidth. The orthogonal frequencies can be pseudorandomly or uniformly spaced, and each beacon can be allocated an equal number of orthogonal frequencies. Each frequency of the interlaced subset of orthogonal frequencies can be modulated with an element of a predetermined data sequence. A mobile device can receive one or more of the beacon signals and determine a position using a position location algorithm that determines position in part on an arrival time of the beacon signal. Where the mobile device can receive three or more beacon signals, the mobile device can perform position location by trilateration to the beacon positions based, for example, on a time difference of arrival.

Description

technical field [0001] The invention relates to the field of location positioning. More specifically, the present invention relates to wireless position location systems, signaling and devices. Background technique [0002] In many applications, it may be advantageous to be able to determine the location of a mobile device. Position location can aid in navigation, tracking or orientation applications. Continuing improvements in the performance of portable electronic devices, especially processor performance, have enabled the addition of location-location functionality to many devices. [0003] For example, it may be desirable to enable the operator of a mobile telecommunications system, such as a cellular telecommunications system, to determine the location of a mobile handset in communication with the system's base transceiver station (BTS). System operators may wish to have location-location functionality, for example to meet the requirements of the U.S. Federal Communi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26G01S5/14G01S5/10G01S19/05G01S19/11G01S19/21G01S19/29G01S19/46
CPCG01S1/04G01S1/042G01S1/045G01S1/20G01S5/10H04L27/2601G01S5/0226G01S5/14
Inventor 诺曼·F·克拉斯纳
Owner QUALCOMM INC
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