Dual Polarization LOS Characterization in Wireless Links
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Solution Overview
Problem
In digital communications, determining the line of sight (LOS) between a transmitter and a receiver is challenging when non-line of sight (NLOS) propagation occurs, leading to errors in distance estimation due to multiple signal reflections, which complicates accurate location determination.
Innovation Solution
A method involving dual polarization procedures where a device communicates with another to determine LOS by measuring signals with orthogonal polarizations, comparing power contributions, and determining if the difference meets a specified threshold to characterize the transmission as either LOS or NLOS, thereby reducing power consumption and improving location accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If time of flight measurement is used to estimate distance, then distance estimation can be obtained, but location determination accuracy deteriorates when NLOS propagation occurs due to multiple signal reflections
Solution Approach 1:
The patent changes the measurement parameter from total received power to polarized power difference. By measuring the difference in power between orthogonal polarizations (ΔP = P1 - P2), the system can distinguish LOS from NLOS conditions, as reflected signals exhibit different polarization characteristics compared to direct signals. This parameter transformation enables accurate location determination even in challenging propagation environments.
2Measurement precision
If dual polarization measurement procedure is implemented, then LOS characterization accuracy is improved, but device complexity increases
Solution Approach 1:
The patent makes existing communication signals serve dual purposes: their primary function for data transmission and a secondary function for LOS determination. By embedding polarization information in standard communication signals and using the same measurement infrastructure for both communication and LOS characterization, the system achieves accurate LOS detection without adding separate dedicated measurement equipment or procedures.
3Measurement precision
If continuous signal monitoring is performed for LOS determination, then location accuracy is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic LOS determination at specific communication events (frame exchanges, handover moments, or when location update is needed) rather than continuous monitoring. This periodic approach maintains location accuracy when needed while significantly reducing power consumption during idle periods, as the device only activates measurement functions at discrete intervals triggered by communication events.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively distinguishes between LOS and NLOS transmissions, reducing power consumption and enhancing the accuracy of distance estimation and location determination in digital communication systems.
Implementation Method 1
measuring, by the first device, a first signal on a first resource of a channel, and measuring, by the first device, a second signal on a second resource of the channel, with the first and second signals comprising a single bit sequence with orthogonal polarizations
Data Source
AI summary
A method performed by a first device includes communicating, with a second device, a LOS determination request including a dual polarization procedure indicator indicating a dual polarization procedure is used in LOS characterization of a transmission between the first device and the second device, measuring a first signal on a first resource of a channel, and measuring a second signal on a second resource of the channel, with the first and second signals comprising a single bit sequence with orthogonal polarizations and are multiplexed in a frequency domain or a code domain.