Polar Receiver Phase Extraction with Harmonic Injection Locking
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Solution Overview
Problem
Polar receiver architectures suffer from poor performance and high bit error rates due to deficiencies in signal processing and modulation phase component extraction without carrier recovery circuitry.
Innovation Solution
The use of a second-harmonic injection locked oscillator (ILO) to compress phase variations by half, combined with a fundamental ILO for phase derivative estimation, and a mixer to generate an estimated phase signal, which is then low-pass filtered to improve phase recovery accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If polar receiver architecture is used to extract modulation phase components without carrier recovery circuitry, then device complexity is reduced, but measurement precision and reliability deteriorate due to poor performance and high bit error rates
Solution Approach 1:
The patent introduces an intermediary signal processing path that processes the I and Q components through separate gain stages and compression functions before recombination. This intermediary processing enables accurate phase extraction without requiring traditional carrier recovery circuitry, thus resolving the contradiction between reduced complexity and maintained precision
Solution Approach 2:
The patent applies parameter changes by using variable gain stages and compression functions that dynamically adjust the I and Q components. By changing the gain parameters and compression characteristics, the system achieves accurate phase component extraction without carrier recovery circuitry, maintaining measurement precision while reducing device complexity
2Reliability
If phase compression is applied to reduce phase variations, then reliability improves by reducing bit error rates, but device complexity increases due to additional signal processing stages
Solution Approach 1:
The patent segments the signal processing into distinct functional blocks: separate gain stages for I and Q components, individual compression functions, and a recombination stage. This segmentation allows each stage to be optimized independently for reliability while keeping the overall complexity manageable through modular design
Solution Approach 2:
The patent implements a universal signal processing framework where the same processing architecture handles multiple modulation types and phase compression requirements. The gain stages and compression functions serve multiple purposes: amplitude normalization, phase compression, and distortion correction, thereby improving reliability without proportionally increasing complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces errors and improves receiver performance by effectively compressing phase variations and reducing amplitude-induced phase distortion, leading to lower bit error rates and enhanced signal processing capabilities.
Implementation Method 1
a second harmonic injection locked oscillator receiving a modulated signal on an input having phase variations of a first range and generating, at an output, a phase compressed signal having a second range of phase variations equal to one half the first range
Implementation Method 2
combining the phase-compressed signal and a delayed version of the phase-compressed signal to generate an estimated phase derivative
Implementation Method 3
low-pass filtering to improve phase recovery accuracy
Data Source
AI summary
Compressing a variable phase component of a received modulated signal with a second harmonic injection locking oscillator, and generating a delayed phase-compressed signal with a fundamental injection locking oscillator, and combining the phase-compressed signal and the delayed phase-compressed signal to obtain an estimated derivative of the variable phase component, and further processing the estimated derivative to recover data contained within the received modulated signal.