TI BLECSRanging 9.20.00 Release Notes

Table of Contents

blecsranging - Bluetooth Channel Sounding Ranging library release notes

This file contains release notes for the blecsranging library.

The library can be used by the application layer when implementing a Bluetooth Channel Sounding system, built on top of the BLE-stack from Texas Instruments. The library provides post-processing algorithms to estimate the distance between the initiator and the reflector.

The library implementation is written for Texas Instruments CC27xx SimpleLink Arm Cortex-M33 wireless MCUs, which include the Algorithm Processing Unit (APU) hardware peripheral. This is used to accelerate several math operations for faster processing.

[v9.20.00.01]

New Features

• For BleCsRanging_Algorithm_Adaptive and BleCsRanging_Algorithm_Music algorithms: a new peak quality criteria has been added to better reject spurious early peaks with poor quality which could lead to underestimations. (BLECSRANGING-108)
• Updated build system to support both cc27xxx10 and cc27xxx20 device variants (previously only cc27xx existed).

Bug Fixes

• Fixed an issue in MUSIC estimation which could cause incorrect distance estimates at long distances.

Known Issues and Limitations

• Phase-based ranging:
  • Post-processing assumes a full vector of Tone_PCT I/Q values, from both initiator and reflector, covering all 72 valid channels.
  • The Tone_PCT from initiator needs to be accompanied with a Tone_Quality metric, in a custom format (uint8_t value, lower is better)
  • When all antenna paths have poor PCT quality (very low SNR), outputs 0 meters distance with quality=0 and confidence=0.
• Phase-based ranging algorithm based on IFFT is not optimized. (Preliminary version, only for experimental use).