Adaptive Bluetooth Receiver ACI Detection and Configuration
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Solution Overview
Problem
Bluetooth receivers face a design dilemma in balancing adjacent channel interference (ACI) suppression and receiver sensitivity, leading to high costs and power consumption due to the need for high-order analog filters and high-resolution ADCs, which are suboptimal in both ACI-present and ACI-absent scenarios.
Innovation Solution
A method is proposed where the receiver is turned on before the scheduled start time to detect ACI presence or absence, allowing for adaptive configuration of filter pass-band bandwidth, ADC settings, and AGC settings based on ACI indicators, using a combination of digital and analog circuitry to measure ACI power accurately and efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a high-order analog filter is used to suppress adjacent channel interference, then ACI suppression is improved, but device complexity and power consumption increase
Solution Approach 1:
The system performs preliminary detection of ACI presence before the scheduled receiving time. By detecting ACI in advance and configuring the filter accordingly, the system avoids using high-order filters when ACI is absent, thereby reducing complexity while maintaining effective ACI suppression when needed
Solution Approach 2:
The filter order is made dynamic rather than fixed. The system adjusts the filter order based on real-time ACI detection results, switching between high-order filter mode when ACI is present and low-order filter mode when ACI is absent, optimizing the balance between ACI suppression and device complexity
2Measurement precision
If a high-resolution ADC with large number of output bits is used, then receiver sensitivity is improved, but device complexity and power consumption increase
Solution Approach 1:
The system performs preliminary detection of ACI presence before the scheduled receiving time. Based on this detection, the system configures the ADC resolution accordingly - using high resolution only when ACI is present, thereby avoiding unnecessary complexity and power consumption when ACI is absent while maintaining sensitivity when needed
3Object-affected harmful factors
If an analog filter with narrow pass-band is used, then ACI suppression is improved, but receiver sensitivity deteriorates
Solution Approach 1:
The pass-band bandwidth of the analog filter is made dynamic rather than fixed. The system adjusts the pass-band width based on real-time ACI detection results - using narrow pass-band when ACI is present for better suppression and wide pass-band when ACI is absent for better sensitivity, optimizing the trade-off between these two competing requirements
4Object-affected harmful factors
If high-order analog filter and high-resolution ADC are used to meet ACI specification, then ACI suppression is improved, but power consumption increases
Solution Approach 1:
The system performs preliminary detection of ACI presence before the scheduled receiving time. Based on this advance detection, the system configures the filter order and ADC resolution to match the actual ACI conditions, avoiding unnecessary power consumption of high-order filters and high-resolution ADCs when ACI is absent while ensuring adequate ACI suppression capability when needed
Solution Approach 2:
The system makes the filter order and ADC resolution dynamic rather than fixed at maximum levels. By continuously adjusting these parameters based on real-time ACI detection, the system optimizes power consumption by using only the necessary computational and hardware resources for the current operating conditions
Data Source
AI summary
The present invention relates to an adaptive, high cost-performance efficient, and power-saving receiving method used for wireless communication systems, such as but not limited to Bluetooth (BT) system, in particular to a method which can detect the presence or absence of the adjacent channel interference (ACT) before the scheduled starting time for receiving a Bluetooth packet, and accordingly set the receiver configurations including the filter's pass-band bandwidth (BW), filter's order, the sampling rate or the number of analog-to-digital-converter (ADC) output bits, and the automatic-gain-control (AGC) algorithm to determine the low noise amplifier (LNA) and variable gain amplifier (VGA) settings.