Polar Receiver Phase Recovery via Injection Locked Oscillators
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Solution Overview
Problem
Polar receiver architectures suffer from poor performance and high bit error rates due to deficiencies in extracting modulation phase components without carrier recovery circuitry.
Innovation Solution
The implementation of a polar receiver architecture that utilizes a second-harmonic injection locked oscillator to compress phase variations, followed by a fundamental injection locked oscillator to generate an estimated phase derivative signal, which is then used to recover the phase information of a modulated signal, thereby reducing errors and improving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If polar receiver architecture extracts modulation phase components without carrier recovery circuitry, then device complexity is reduced, but measurement precision deteriorates resulting in high bit error rates
Solution Approach 1:
The patent introduces an intermediary carrier signal generation mechanism that creates a virtual carrier through signal processing rather than traditional PLL circuitry. The system generates in-phase and quadrature components through mathematical operations on the received signal, serving as a mediator between the received modulated signal and the extracted modulation components, thereby maintaining measurement precision while avoiding complex carrier recovery hardware
Solution Approach 2:
The patent replaces the mechanical/electrical carrier recovery system (PLL circuitry) with a signal processing-based approach using mathematical operations. Instead of using physical oscillators and phase-locked loops to generate the carrier, the system uses digital signal processing to synthesize the carrier and extract modulation components, substituting a mechanical system with a computational one
2Ease of operation
If polar receiver architecture is simplified without carrier recovery, then ease of operation improves, but reliability deteriorates due to poor performance
Solution Approach 1:
The patent segments the signal processing into distinct functional components: in-phase component extraction, quadrature component extraction, and modulation demodulation. Each segment handles a specific aspect of the signal processing, making the overall system easier to implement and operate while maintaining reliability through specialized processing for each function
Solution Approach 2:
The patent creates a virtual copy of the carrier signal through mathematical operations on the received signal. By generating in-phase and quadrature components that replicate the carrier's properties without requiring physical carrier recovery circuitry, the system maintains reliability while simplifying the architecture
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 the performance of the polar receiver by compressing phase variations and accurately recovering phase information, leading to lower bit error rates and enhanced signal processing capabilities.
Implementation Method 1
a second-harmonic injection locked oscillator to receive a modulated signal and compress phase variations
Implementation Method 2
a fundamental injection locked oscillator to generate an estimated phase derivative signal
Data Source
AI summary
A method of generating inphase and quadrature signals from a polar receiver providing a phase derivative signal and an envelope magnitude signal comprising receiving an estimated phase derivative signal; generating an estimated phase signal; mapping the estimated phase signal to an angular value; converting the estimated phase signal to an inphase signal and a quadrature signal based on the angular value; and, providing the inphase signal and quadrature signal to a demodulation circuit.