Multimode Receiver Interference Mitigation via Variable Bandwidth Filter
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Solution Overview
Problem
Conventional receiver architectures in cellular systems face performance degradation due to interference, as they require multiple narrow analog filters and high linearity RF stages, which increase current drain and distort the desired signal, and fail to adapt to varying interference conditions effectively.
Innovation Solution
A novel receiver architecture that uses estimation circuits to measure voltage or power with adjustable filters, and a state machine to dynamically adjust amplifier bias and gain, as well as filter settings, to optimize performance based on the nature and location of interference, allowing for intelligent filtering and power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple narrow analog filters are used to prevent clipping due to interference, then interference rejection is improved, but current drain increases and desired signal is distorted
Solution Approach 1:
The patent implements dynamic filter bandwidth adjustment where the analog filter bandwidth is adaptively changed based on detected interference conditions. When interference is detected, the filter bandwidth is narrowed to reject interference; when no interference is present, the bandwidth is widened to pass more of the desired signal, thereby reducing unnecessary filtering and current drain while maintaining interference rejection when needed.
Solution Approach 2:
The patent changes the bandwidth parameter of the analog filter dynamically based on interference detection results. By adjusting the filter bandwidth parameter from narrow to wide depending on interference conditions, the system optimizes the trade-off between interference rejection and current drain, avoiding continuous operation with narrow filters that would unnecessarily increase power consumption.
2Reliability
If high linearity RF stages are designed to minimize distortion in the presence of interference, then signal quality is improved, but bias current and current drain increase
Solution Approach 1:
The patent implements dynamic bias current adjustment where the RF stage bias current is adaptively changed based on detected interference conditions. When interference is detected, the bias current is increased to maintain high linearity and signal quality; when no interference is present, the bias current is reduced to lower power consumption, thereby dynamically optimizing the trade-off between signal quality and current drain.
Solution Approach 2:
The patent changes the bias current parameter of RF stages dynamically based on interference detection. By adjusting the bias current from high to low depending on interference conditions, the system optimizes the trade-off between maintaining signal quality through high linearity and reducing power consumption, avoiding continuous operation with high bias currents that would unnecessarily increase current drain.
3Object-affected harmful factors
If narrow analog filters are continuously used to remove interference, then interference rejection is improved, but desired signal passes through reduced leading to performance degradation
Solution Approach 1:
The patent implements dynamic filter bandwidth adjustment where the analog filter bandwidth is adaptively changed based on detected interference conditions. When interference is detected, the filter bandwidth is narrowed to reject interference; when no interference is present, the bandwidth is widened to pass more of the desired signal, thereby reducing unnecessary filtering and current drain while maintaining interference rejection when needed.
4Object-affected harmful factors
If fixed filter bandwidth is used to remove completely any interference, then interference rejection is improved, but receiver performance is reduced when expected interference is not present
Solution Approach 1:
The patent implements dynamic filter bandwidth adjustment where the analog filter bandwidth is adaptively changed based on detected interference conditions. When interference is detected, the filter bandwidth is narrowed to reject interference; when no interference is present, the bandwidth is widened to pass more of the desired signal, thereby reducing unnecessary filtering and current drain while maintaining interference rejection when needed.
Solution Approach 2:
The patent employs a feedback mechanism where the receiver detects interference conditions and uses this information to adjust the filter bandwidth dynamically. The detection result feeds back to control the filter bandwidth setting, enabling the receiver to adapt to varying interference conditions and optimize performance accordingly, rather than using a fixed bandwidth that may be overly restrictive when interference is absent.
Data Source
AI summary
Embodiments include a novel receiver architecture to optimize receiver performance in the presence of interference. In various embodiments, power estimation circuits are used to determine the exact nature of the interference and to optimize the performance correspondingly. Variable selectivity of at least one power estimation circuit is achieved using a filter with variable bandwidth, with power measurements taken using different bandwidth settings. Also, the actual method of optimizing the receiver performance is novel compared to the prior art in that the gain settings and the baseband filter order (stages to be used) will be optimized based on the nature of the interference as determined by the power detector measurements. For a device such as a cellular phone that operates in a dynamic and changing environment where interference is variable, embodiments advantageously provide the capability to modify the receiver's operational state depending on the interference.