Wireless Device Localization Using Power-Independent Parameters
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing systems for localizing wireless devices within a volume, such as vehicles, face challenges when power control is enabled, as they often require information from the control channel to determine transmission power, and struggle with accurately locating devices amidst moving objects and varying power levels.
Innovation Solution
A system utilizing multiple antennae deployed within a known volume, with analog-to-digital converters and processors that compute real-time output parameters independent of transmission power, comparing these parameters to reference outputs to estimate device location using quality of reception ratios and probability density functions, without relying on control channel information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power control is enabled in wireless devices, then transmission power varies dynamically, but existing localization systems require control channel information to determine transmission power, increasing system complexity and reducing reliability
Solution Approach 1:
The patent extracts the transmission power determination from the control channel information and relocates it to the data channel by embedding power information in pilot symbols. This eliminates the need for separate control channel processing for power determination, reducing system complexity while maintaining localization reliability.
Solution Approach 2:
The patent introduces pilot symbols as an intermediary carrier for transmission power information. These pilot symbols serve as a mediator between the transmitter and receiver, enabling power level determination without requiring control channel messages, thus simplifying the overall system architecture.
2Measurement precision
If RSSI-based localization is used, then location can be deduced from signal strength, but accuracy deteriorates when transmission power levels vary due to power control
Solution Approach 1:
The patent implements a feedback mechanism where the transmitting device sends pilot symbols that encode transmission power information. The receiving device uses this feedback information to compensate for power variations in RSSI measurements, maintaining location accuracy despite dynamic power control adjustments.
Solution Approach 2:
The patent changes the parameter being measured from raw RSSI to power-compensated RSSI by incorporating transmission power information from pilot symbols. This parameter transformation allows accurate location determination even when transmission power levels dynamically change due to power control.
3Measurement precision
If control channel information is required for power determination, then transmission power can be known, but localization system complexity increases and real-time performance decreases
Solution Approach 1:
The patent applies preliminary action by embedding transmission power information in pilot symbols that are transmitted before the actual data. This allows the receiver to determine power levels in advance, enabling real-time compensation without requiring subsequent control channel processing, thus improving localization speed while maintaining accuracy.
Data Source
AI summary
A system for localizing a transmitting wireless device within a known volume, the system including antennae deployed in respective locations at least some within the known volume, each of the antennae operative to receive and output a signal from the transmitting device; analog-to-digital converter/s; and a processor receiving digital sampled received signals and computing real time output parameter/s as function of: sampled received signals S, received from the transmitting wireless device at antenna i; and of sampled signals, received from the transmitting wireless device at antenna j and sampled, simultaneously with reception at antenna I and sampling of sampled received signals S, function being independent of power level at which transmitting device is transmitting, and to estimate transmitting wireless device's location within volume by comparing the parameter/s to reference output parameters respectively having known correspondence to known possible locations/s within volume, for at least two of the antennae.