Multi-Antenna Auto-Correlation Selection for Low-Power LR BLE Reception
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Solution Overview
Problem
Existing receivers for IoT devices operating under Long Range BLUETOOTH LOW ENERGY (LR BLE) consume excessive power due to continuous operation of correlation circuits, especially when designed for multiple wireless standards with varying signal levels.
Innovation Solution
Implementing a multi-antenna system with auto-correlation circuits to detect periodic signals, activating correlation circuits only when a likely signal is detected, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If correlation circuits operate continuously to detect signals in multi-antenna systems, then signal detection reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic sampling of received signals at multiple antennas followed by auto-correlation detection at reduced intervals, rather than continuous correlation processing. The system periodically checks for periodic signals using low-power auto-correlation circuits, and only activates full correlation circuits when a potential signal is detected, thereby reducing overall power consumption while maintaining detection reliability
Solution Approach 2:
The patent employs preliminary auto-correlation detection on sampled signals to identify potential periodic signals before activating the power-intensive correlation circuits. This preliminary screening action allows the system to prepare for full signal processing only when necessary, avoiding continuous operation of high-power components while ensuring reliable signal detection
2Reliability
If multiple antennas are used to improve signal reception, then signal detection capability is improved, but device complexity increases
Solution Approach 1:
The patent divides the signal processing function into separate stages: initial signal sampling at multiple antennas, followed by auto-correlation detection, and finally correlation processing only for promising candidates. This segmentation allows multiple antennas to be used for improved reception while avoiding the complexity of continuously processing all antenna signals through full correlation circuits
Solution Approach 2:
The patent combines multiple antenna inputs into a unified detection framework where auto-correlation results from multiple antennas are evaluated together. The control circuit integrates information from multiple antenna channels and selectively activates correlation circuits based on combined detection results, reducing overall system complexity compared to independent processing of each antenna
Data Source
AI summary
Systems and methods for low-power auto-correlation antenna selection for multi-antenna systems are disclosed. In particular, a computing device, such as an Internet of Things (IoT) computing device, may include a transceiver operating with multiple antennas. For example, the computing device may operate under a low-power wireless standard such as Long Range BLUETOOTH LOW ENERGY (LR BLE). In an exemplary aspect, an antenna from amongst the multiple antennas may be selected based on which antenna is receiving a best copy of a periodic signal. The periodic signal is likely indicative of a preamble pattern and, as such, may be used to activate a cross-correlation circuit for signal detection confirmation. Power consumption is reduced by delaying activation of the cross-correlation circuit until a likely signal is detected by detection of the periodic signal.