RF Signal Parameter Control for Wireless Coexistence Interference
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Solution Overview
Problem
The overlapping and adjacent frequency bands of wireless communications services like WiMAX, WiFi, and Bluetooth in mobile devices lead to transmission interference, causing the RF front end circuit to operate nonlinearly and reducing the signal-to-noise ratio (SNR) of the wanted signal.
Innovation Solution
A communications apparatus comprising a signal processing device, an interference detector, and a coexistence optimization controller that dynamically adjusts signal processing parameters based on characteristics of interference signals, such as power and frequency, to improve SNR and prevent nonlinear operation of the RF front end circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple wireless communications modules (WiFi, Bluetooth, WiMAX) are integrated in a mobile device, then the device provides more wireless communication services, but transmission interference occurs due to overlapping and adjacent frequency bands
Solution Approach 1:
The patent implements dynamic adjustment of signal processing parameters (filter bandwidth, gain, demodulation type) based on real-time detection of interference signal characteristics. The system continuously monitors the RF signal environment and adapts parameters to maintain optimal performance despite varying interference conditions from coexisting wireless modules.
Solution Approach 2:
The patent changes physical parameters of the signal processing system including filter bandwidth, amplifier gain, and demodulation type based on detected interference characteristics. These parameter adjustments allow the system to optimize signal reception under different interference scenarios caused by multiple wireless communications services.
2Power
If the RF front end circuit processes strong interference signals, then the circuit operates nonlinearly, but the signal-to-noise ratio (SNR) of the wanted signal degrades
Solution Approach 1:
The patent applies preliminary filtering and gain control before the interference signal can cause nonlinear operation. By detecting interference characteristics in advance and adjusting filter bandwidth and amplifier gain accordingly, the system prevents the RF front end circuit from operating nonlinearly, thereby maintaining SNR of the wanted signal.
Solution Approach 2:
The patent implements a feedback mechanism where the system continuously detects interference signal characteristics and uses this information to adjust signal processing parameters. This closed-loop control ensures the RF front end circuit operates in its linear region even when strong interference signals are present, preserving signal-to-noise ratio.
Data Source
AI summary
A communications apparatus is provided. A signal processing device receives an RF signal comprising a wanted signal complying with a first wireless communications protocol from an air interface and processes the RF signal according to one or more signal processing parameter(s) to obtain the wanted signal. An interference detector analyzes one or more characteristic(s) of an interference signal of the wanted signal. The interference signal complies with a second wireless communications protocol different from the first wireless communication protocol. A coexistence optimization controller is coupled to the signal processing device and the interference detector, obtains information regarding the characteristic(s) of the interference signal from the interference detector and dynamically adjusts the signal processing parameter(s) according to the characteristic(s) of the interference signal.