Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Signal ranging and positioning method

A ranging method, a signalling technology, used in wireless communications, location-based services, electrical components, etc.

Active Publication Date: 2014-03-19
HAIMEN BIWEI INTPROP SERVICE CO LTD
View PDF3 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] After using OFDM to subcarrierize the channel, the transmission technology of loading and transmitting data on some subcarriers is OFDMA. The OFDMA proposed in the current literature is in the positioning The application is to allocate the entire OFDM subcarriers to each user in blocks. For example, an OFDM signal has 1024 subcarriers, and 4 users (or transmitters, or base stations: depending on the situation) are allocated as follows: The first 256 subcarriers Allocate to user 1, then 256 subcarriers to user 2, then 256 subcarriers to user 3, and the last 256 subcarriers to user. In terms of communication, there is no problem with this allocation; in terms of positioning, such allocation will lead to mean square bandwidth The decline, the positioning accuracy is seriously reduced

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Signal ranging and positioning method
  • Signal ranging and positioning method
  • Signal ranging and positioning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] figure 2 Spectrum allocation for optimal ranging signals is described.

[0039] Such as Figure 11 and Figure 12 As shown, the ranging method of the signal is described in detail: the 0th and N-1 subcarriers are generated as high-level data source signals, and the middle N-2 subcarriers are all low-level data source signals, which are converted from serial to parallel. After Liye inverse transformation, it is converted from parallel to serial, and then the signal is amplified and then transmitted; the 0th and N-1 subcarriers are received as high level, and the middle N-2 subcarriers are all low level signals, and the signal Amplify, then convert the serial signal into a parallel signal, filter out the noise on the intermediate subcarrier after Fourier transform, and then convert the parallel signal into a serial signal, and at the same time, copy the original transmitted signal at the receiving place, and the local The oscillator converts the original transmission ...

Embodiment 2

[0045] Such as Figure 13 and Figure 14 As shown, the optimal signal positioning method, its ranging part is as in embodiment 1, the difference is that it includes k transmitters and a receiver, and simultaneously sends positioning signals from transmitters at different locations to seek location information, and receives them at one location The receiver receives, for the kth transmitter, k=1, 2, 3, 4, the k-1 and N+k-5 subcarriers are at high level, and the other N-2 subcarriers are at low level, and the transmitter The bandwidth of the signal is the same, the bandwidth of the subcarriers at both ends is the same, and the distance between the subcarriers is the same.

[0046] Signal positioning device, such as the signal ranging device shown in embodiment 1, which includes a plurality of transmitters and a receiver, the transmitted signal is an OFDMA signal, for the kth transmitter, k=1,2,3, 4: The k-1 and N+k-5 subcarriers are at high level, and the other N-2 subcarriers...

Embodiment 3

[0051] Figure 7 Frequency-domain representation of an optimal OFDMA ranging signal.

[0052] The best signal is the OFDMA signal, and the positioning system is: four transmitters send signals to a receiver at the same time, and the receiver detects the signals from all transmitters and estimates the position of the receiver itself. Assuming a common signal bandwidth [-B,B] for all transmitters, Figure 8 describes the spectrum allocation of the optimal positioning signal for each transmitter, expressed as the width of the spectrum occupied by the occupied signal.

[0053] Figure 10 Shown is the framework of a (ranging or) positioning system, with a transmitter (blue box) transmitting an OFDM signal and one or more base stations receiving this signal. In a ranging system, there is only one transmitter and one receiving base station, and the base station receives the signal and estimates the distance traveled by the signal. In a three-dimensional positioning system, there ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a signal ranging and positioning method. In the positioning system provided by the invention, given that a plurality of transmitters simultaneously transmit positioning signals for seeking positional information, in order to avoid interference among the positioning signals, a multi-access method is in need of design, which means to use optimal ranging and positioning signals. The method provided by the invention can be used for occupying the widest bandwidth and concentrating energy at two ends of the bandwidth, with the generated signals having the highest distance estimation accuracy; meanwhile, as for the positioning system in which the plurality of transmitters simultaneously transmit signals, the positioning signals of the transmitters are required to have a substantially equal ranging accuracy; and therefore, the optimal positioning and ranging signals (for a mean square bandwidth) occupy almost the entire bandwidth, with neither frequency overlap nor mutual signal interference.

Description

technical field [0001] This patent belongs to the field of signal ranging and positioning. Under the premise of fixed signal bandwidth and transmission power, this signal has the highest ranging and positioning accuracy. Background technique [0002] like figure 1 As shown, the frequency domain of the OFDM signal indicates that when the OFDM signal is applied in the communication field, because the communication pursues the transmission rate, although each user only uses a part of it, it will still use up all the subcarriers. [0003] In positioning, PN (or CDMA) signal has always been the mainstream, this is because of the success of PN application in GPS. Including WiMax, although OFDM is used for communication, PN signals are still used for positioning. [0004] Existing literature points out that in delay estimation of ranging or positioning systems, OFDM is better than commonly used pseudo-random sequences. Under the same signal-to-noise ratio, OFDM ranging or positio...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04W64/00H04W4/02
Inventor 王东林杨翰曹辉
Owner HAIMEN BIWEI INTPROP SERVICE CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com