Multi-Branch Wireless Receiver Switching for Rapid Signal Changes
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Solution Overview
Problem
Existing wireless receivers face challenges in accurately demodulating signals with large dynamic range changes due to limitations in simultaneous and non-simultaneous dynamic range capabilities, leading to saturation or reduced sensitivity, especially when large signal changes occur within the signal duration.
Innovation Solution
A receiver design that includes a multi-branch correction preprocess module and a digital receiving path post-stage, allowing for amplitude and phase correction of digital baseband signals before switching, enabling switching without synchronous signal control and improving demodulation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single variable-gain branch is used to process the received signal, then the circuit complexity is reduced, but the non-simultaneous dynamic range is limited and cannot rapidly trace large signal changes
Solution Approach 1:
The receiver is divided into multiple fixed-gain branches (first branch, second branch, third branch, etc.), each with different fixed gain values. This segmentation allows the system to handle a wider dynamic range by selecting the appropriate branch based on signal strength, resolving the contradiction between circuit simplicity and dynamic range capability.
Solution Approach 2:
The patent implements dynamic branch switching based on signal conditions. The receiver can switch between different fixed-gain branches according to the received signal strength, enabling rapid adaptation to large signal changes without requiring complex variable gain control circuits.
2Adaptability or versatility
If multiple fixed-gain branches are used to extend the non-simultaneous dynamic range, then the dynamic range capability is improved, but the device complexity increases
Solution Approach 1:
Multiple fixed-gain branches are merged into a unified receiver structure with a common signal processing path after the branches. This combining approach allows the system to benefit from multiple gain levels while sharing common components (such as the ADC and digital processing units), thereby reducing overall complexity compared to fully independent branch designs.
Solution Approach 2:
The patent changes the gain parameter across multiple branches rather than using a single variable gain element. By fixing the gain in each branch and selecting among them, the system achieves extended dynamic range with simpler control logic, as each branch operates at its optimal fixed gain point without requiring continuous adjustment.
3Measurement precision
If synchronous signal control is used for branch switching, then the switching accuracy is improved, but the response time to trace rapid signal changes is reduced
Solution Approach 1:
The patent prepares multiple fixed-gain branches in advance, each configured for specific signal strength ranges. The switching decision is made based on preliminary signal strength detection, allowing the system to quickly select the appropriate pre-configured branch without requiring complex synchronous coordination during the switching event itself.
Solution Approach 2:
The patent uses simple, inexpensive switching mechanisms (such as multiplexers or analog switches) to select between branches, rather than relying on complex synchronous control systems. This approach prioritizes fast response time over extreme switching precision, using simple control logic that can react rapidly to signal changes.
Data Source
AI summary
A receiver and method for receiving wireless signal are characterized in that a multi-branch correcting and switching module (402) is added, which is used for amplitude and phase correction of multiple digital baseband signals outputted from a multi-branch correction preprocess module (401); then, the signals are switched according to a switching strategy, and one of the corrected digital baseband signals is outputted; finally, the selected digital baseband signal is inputted to a digital receiving path post-stage (403) and further digital processing on the signal is performed, so that a bit stream is outputted. The multiple digital baseband signals are corrected before switching to be consistent with each other in terms of amplitude and phase, and specific synchronization information is not necessary; therefore, the signals can be switched rapidly when the signals are varied and need to be switched, and a rapid track for the signal change is achieved.