Diversity Receiver Front End Gain Switching for Signal Attenuation
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Solution Overview
Problem
In wireless communication systems, diversity receive antennas often face challenges in optimizing signal processing due to physical separation, leading to varying signal characteristics and attenuation, which affects data throughput and signal quality.
Innovation Solution
A receiving system with a controller that selectively activates paths between multiplexers and includes variable-gain amplifiers (VGAs) to filter and amplify signals based on quality of service metrics, allowing for adaptive gain control and efficient signal processing across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diversity receive antennas are placed physically far from primary antenna to increase performance, then signal quality and data throughput are improved, but signal attenuation and varying signal characteristics worsen
Solution Approach 1:
The patent implements dynamic gain control through variable-gain amplifiers that adaptively adjust amplification levels based on received signal strength. The system dynamically selects between different gain stages (e.g., 0dB, 10dB, 20dB) to compensate for signal attenuation caused by physical separation between antennas, thereby maintaining optimal signal quality without requiring the antennas to be placed closer together.
Solution Approach 2:
The system changes the gain parameter of amplifiers based on signal conditions. By monitoring signal strength and adjusting the amplification factor, the system compensates for attenuation effects. Additionally, the patent employs switchable RF paths that change system parameters (active components, filter characteristics) based on operating conditions, allowing optimal performance across varying signal attenuation scenarios.
2Reliability
If multiple amplifiers are used in downstream modules to compensate for attenuation, then signal quality is improved, but device complexity and cost increase
Solution Approach 1:
The patent designs variable-gain amplifier stages that can serve multiple frequency bands and signal conditions with a single amplifier circuit. The same amplifier infrastructure is used across different RF paths and frequency configurations, reducing the total number of amplifiers needed while maintaining signal quality. The system achieves multi-functionality through switchable configurations rather than dedicated amplifiers for each scenario.
Solution Approach 2:
Instead of using multiple fixed-gain amplifiers in parallel, the system employs dynamic gain adjustment within fewer amplifier stages. The variable-gain amplifiers can adapt their amplification level to handle different signal strengths, eliminating the need for multiple amplifiers operating at fixed gain levels. This dynamic approach reduces component count while maintaining performance across varying signal conditions.
3Device complexity
If fixed-gain amplifiers are used to simplify the system, then device complexity is reduced, but adaptability to different signal conditions deteriorates
Solution Approach 1:
The patent implements variable-gain amplifiers that can dynamically adjust their amplification factor based on signal conditions. The gain can be changed in discrete steps (e.g., 0dB, 10dB, 20dB) or continuously, allowing the system to adapt to different signal strengths and operating conditions. This dynamic capability provides versatility without requiring complex manual configuration or multiple fixed-gain amplifier banks.
Solution Approach 2:
The system changes the gain parameter of amplifiers based on monitored signal characteristics such as received signal strength. By automatically adjusting the amplification factor, the system adapts to varying signal conditions without requiring complex hardware reconfiguration. This parameter-based control achieves high adaptability with relatively simple control logic.
Data Source
AI summary
A receiving system includes a controller that selectively activates one or more of a plurality of paths between an input of a first multiplexer and an output of a second multiplexer. The receiving system includes a plurality of bandpass filters, each one of the bandpass filters being disposed along a corresponding one of the plurality of paths and configured to filter a signal received at the bandpass filter to a respective frequency band. The receiving system also includes a plurality of variable-gain amplifiers (VGAs), each one of the plurality of VGAs disposed along a corresponding one of the plurality of paths and configured to amplify a signal received at the VGA with a gain controlled by an amplifier control signal received from the controller. At least one, but not all, of the VGAs is a fixed-gain amplifier with a bypass switch to selectively bypass the fixed-gain amplifier.