Adaptive Harmonic Rejection Receiver Mixer Switching
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Solution Overview
Problem
Existing harmonic rejection receivers in broadband communication systems suffer from linearity degradation and noise introduction due to fixed HR mixers that cannot switch to non-harmonic rejection mode, even when signals are weak or at LO harmonic frequencies.
Innovation Solution
An adaptive HR receiving device and method that includes a low noise amplification module, HR and NHR mixers, and a control device to select the appropriate mixer based on signal strength, allowing switching between harmonic and non-harmonic rejection modes without degrading system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a fixed HR mixer is used in the receiver chain, then harmonic rejection is achieved, but linearity degrades and noise is introduced
Solution Approach 1:
The patent implements a dynamic switching mechanism that allows the receiver to alternate between HR mixer mode and NHR mixer mode based on real-time signal conditions. The control device monitors RSSI and automatically selects the appropriate mixer type, making the system adaptive rather than fixed. This resolves the contradiction by enabling harmonic rejection only when needed, preserving linearity during normal operation.
Solution Approach 2:
The system changes the operational parameter of the mixer from a fixed HR configuration to a variable state that can switch between HR and NHR modes. By adjusting the mixer type parameter based on signal strength and harmonic presence, the system optimizes both harmonic rejection and linearity performance dynamically.
2Object-affected harmful factors
If an HR mixer is used continuously, then harmonic rejection is maintained, but receiving performance degrades when weak or no signals are present
Solution Approach 1:
The system dynamically adapts its reception mode based on real-time conditions. When weak signals or no signals are detected, the control device switches from HR mixer to NHR mixer, eliminating the performance degradation caused by continuous HR mode operation while maintaining harmonic rejection capability when needed.
Solution Approach 2:
The control device periodically monitors RSSI and switches between HR and NHR modes based on detected signal conditions. This periodic assessment allows the system to alternate between harmonic rejection and normal reception modes, optimizing performance across varying operational scenarios.
3Object-affected harmful factors
If an HR mixer is used, then harmonic rejection is achieved, but device complexity increases
Solution Approach 1:
The system implements a universal receiver architecture that can perform both HR and NHR functions using the same physical infrastructure. By incorporating both HR mixer and NHR mixer capabilities in a single receiver chain with automated switching, the system achieves multi-functionality without requiring separate dedicated receivers for each mode.
Solution Approach 2:
The patent extracts the harmonic rejection function as a separate controllable component (HR mixer) that can be selectively engaged or disengaged. The control device isolates the HR functionality and switches it in or out based on conditions, preventing the HR mixer's complexity from always being present in the signal path.
Data Source
AI summary
The invention provides an adaptive harmonic rejection (HR) receiving device, including a low noise amplification module; at least one HR mixer; at least one non-harmonic rejection (NHR) frequency mixer; and a control device. A received signal passes through the low noise amplification, and then passes through the at least one HR mixer or the at least one NHR mixer; the control device measures a receiving signal strength index (RSSI) after the received signal passes through the at least one HR mixer or the NHR mixer, and selects an NHR mixer or an appropriate HR mixer for the received signal according to a result of the measurement. The adaptive HR receiving device of the present invention is capable of adaptively judging whether to implement HR or determining which HR to implement according to features of the received signal, thereby improving the reception flexibility and reception performance.