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Ternary sequences with power of two exponent dimensionalities suitable for channel estimation

A channel estimation and sequence technology, applied in channel estimation, wireless communication, electrical components, etc.

Inactive Publication Date: 2016-06-01
QUALCOMM INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in many cases channel estimation may occur before determining the round-trip time delay

Method used

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  • Ternary sequences with power of two exponent dimensionalities suitable for channel estimation
  • Ternary sequences with power of two exponent dimensionalities suitable for channel estimation
  • Ternary sequences with power of two exponent dimensionalities suitable for channel estimation

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Embodiment Construction

[0024] Methods, systems, and devices related to channel estimation in position tracking systems are described. These methods, systems and devices may include determining or designing (or determining and designing) a sequence for use with determining the location of a location tracking tag. In order to achieve low implementation complexity, it may be desirable to employ a preamble sequence with a minimum periodic dimension that is a power of two. In some cases, using such an exponential dimensional sequence of 2 (e.g., N=2 d ) will allow channel estimation schemes to be implemented based on radix-2 (radix-2) Fast Fourier Transform (FFT) engines, which in turn can reduce circuit complexity.

[0025] Designing sequences with an exponential dimension of 2 (eg, ternary sequences) may include solving certain optimization problems. In some instances, sequence determination requires modifying the length of the sequence or modifying the spectral response of the sequence, or both.

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Abstract

Methods, systems, and devices for channel estimation in a location tracking system are described. The methods, system, and devices may include tools and techniques for determining and / or designing perfect or semi-perfect sequences (including preamble sequences) for implementation in a location tracking system. Sequences having 2's exponent dimensionality, such as ternary sequences, may be determined and employed, which may help reduce implementation complexity and / or operating power consumption. Sequences may be determined using mean square error and / or maximum autocorrelation peak performance metrics.

Description

[0001] cross reference [0002] This patent application claims priority to U.S. Patent Application No. 14 / 049,256, filed October 9, 2013, by Ekbatani et al., entitled "Ternary Sequences With Power of Two Exponent Dimensionalities Suitable for Channel Estimation," which application has been assigned to the assignee of the present application . Background technique [0003] In certain indoor and enterprise environments, it may be important to easily locate various types of assets or people, or both. Hospitals, retail stores, and warehouses might all be examples of such environments. The accuracy and speed used to monitor the location of assets or people in an indoor environment can be important factors in determining the usefulness of a tracking system. Additionally, it would be desirable to have a tracking system that is cost effective, scalable, and capable of providing continuous, precise and accurate position monitoring. [0004] Different systems and devices can be used ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02G01S5/00G01S5/04G06Q10/00G08B13/24G01S5/02G01S11/08H04L25/49
CPCG01S11/08H04L25/0226H04L25/4923G08B21/0272G01S5/0226H04L25/024H04L25/4927H04W64/00G01S5/06G06Q10/00
Inventor S·埃克巴塔尼A·K·古普塔
Owner QUALCOMM INC