PoLTE’s Patented Technology Makes it all Possible
Who is PoLTE?
We are specialists with decades of experience in the following fields; Radar, Signal Processing and Multipath Mitigation.
These decades of research have allowed PoLTE to amass 24 Issued Patents and 36 Pending Patents. PoLTE has applied these patented technologies and techniques to standard approaches (i.e. OTDOA2, UTDOA1, and AoA2) to create a unique location system solution.
PoLTE has overcome the inherent challenges of using radio frequencies for terrestrial geolocation. Location errors are primarily caused by RF propagation effects, such as multipath signals that reflect off walls and other objects and interfere with the direct line of sight signal.
PoLTE’s main advantage is the ability to accurately measure the true distance, the direct line of sight path (DLOS) between any LTE/OFDM device and the local LTE/OFDM cellular infrastructure.
By mitigating the multipath and accurately identifying and measuring the DLOS path, the PoLTE system can locate an LTE device both indoors and outdoors with very high precision and reliability. Field trials have shown that devices can be located indoors as accurately as a few meters.
What Makes PoLTE Unique?
The core of PoLTE is the adaptation of proven advanced radar location techniques to OFDM wireless radio signals such as LTE, to accurately locate and track any LTE device indoors or outside. LTE signal modulation is based on OFDM, allowing for the first time, the use of advanced radar location techniques to cellular signals. This is true for every LTE network deployed in the world. Furthermore, the 5G introduction of massive MIMO and beamforming further expands the repertoire of radar and/or spectral estimation technologies that can drive additional location capability into the cellular network.
• Super Resolution Algorithms
PoLTE patented the use of high-resolution spectral estimation techniques and algorithms that have the ability to resolve close multipath signals hence resulting in an undistorted estimate of the direct-path signal. These algorithms can resolve multipath conflicts up to 10X the FFT (Fast Fourier transform) limit, and can work with a DLOS signal that is significantly attenuated relative to one or more reflected signals. In fact, the results approach the best theoretical performance possible (i.e., the Cramer-Rao bound).
• Advanced Multipath Mitigation
Even the highest resolution techniques are unable to resolve some of the multipath. For these situations, PoLTE has developed further enhancements that take into account all available system knowledge to produce a high fidelity estimate of the direct-path signal. These enhancements include location consistency methods often employed in target tracking systems, to improve the position fix.
• Doppler Processing
The Doppler estimates are used to correct the LTE OFDM signals frequency offset, which impacts the location accuracy. The Doppler shift is a result of the relative motion of the LTE device manifesting itself as a carrier frequency offset. PoLTE’s Doppler shift estimate is radar technology that has been tailored to work effectively with the OFDM signal structure and within LTE environments and infrastructure.
• Virtualized Cloud Computing Architecture
PoLTE technology revolutionizes LTE standard network positioning without impacting the LTE network infrastructure and/or LTE modem design. PoLTE off-loads the heavy computational location algorithms, the “engine”, from the device to virtualized location servers in the Cloud or in Mobile Edge Computers (MEC). This “Lite-touch” architecture simplifies device integration as it utilizes an open interface to send small bits of data from the device to the “engine” where the data is then processed. This reduces battery drain to a fraction compared to GPS or other technologies while also enabling advanced positing features, previously not feasible, to improve the location accuracy and reliability. This architecture can easily be adapted to send similar bits of information from the cellular infrastructure to the “engine”, enabling an infrastructure centric solution.
- Device hears the CRS from the serving cells and neighboring cells simultaneously;
- Device processes the CRS data to establish and maintain connection. This information is buffered and sent to PoLTE Cloud;
- PoLTE’s Engine produces the best location by applying specialized techniques and technologies to standard approaches (i.e. OTDOA).
PoLTE’s Angle of Arrival (AoA)
PoLTE has advanced the state of the art of AoA through the patented hybridization of both TDOA and AoA location approaches. The adaptation combines the time difference of the ranging signal received at each antenna (the TDOA) and the AoA technique that compares the phase difference of the ranging signal collected by each antenna. PoLTE AoA has enhancements that resolve the AoA ambiguity issues related to the usage of the LTE signals and infrastructure. The combination of PoLTE’s AoA with the transition to 5G massive mimo and beamforming will further expand the repertoire of radar techniques that can drive additional location capability into the cellular network … enabling the transformation of these networks into PoLTE’s “cellular positioning system”
1 OTDOA = Observed Time Difference of Arrival. UTDOA = Uplink Time Difference of Arrival. TDOA = Time Difference of Arrival. AoA = Angle of Arrival.
“No GPS, No Wi-Fi, No Bluetooth … No Problem! PoLTE removes the dependance on other signals to locate and track LTE devices.”- Russ Markhovsky
PoLTE is a software company whose location technologies seamlessly track the “Internet of Things” (IoT) and mobile devices indoors and outdoors via its cloud-based, virtualized location platform.