Adaptive Phase Recovery Loop Bandwidth Control
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Solution Overview
Problem
Current bandwidth setting mechanisms in communication systems, such as DVB-S, are inadequate for non-AWGN environments and antenna polarization deviations, as they rely solely on absolute phase noise values, leading to inaccurate phase recovery loop bandwidth settings.
Innovation Solution
A signal receiving apparatus and method that calculate both the average and variance of phase noise amounts to adjust the phase recovery loop bandwidth, providing a more accurate and adaptive bandwidth setting based on these metrics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the bandwidth of the phase recovery loop is increased, then it is easier to achieve a locked state, but phase error tracking accuracy decreases
Solution Approach 1:
The patent applies dynamics by making the loop bandwidth adjustable rather than fixed. The bandwidth setting circuit dynamically changes the loop filter bandwidth based on real-time phase noise characteristics, allowing the system to adapt between locking ease and tracking accuracy requirements as channel conditions vary.
Solution Approach 2:
The patent changes the parameter of loop bandwidth based on phase noise statistics. By calculating the average and variance of phase noise amounts and using these to determine appropriate bandwidth settings, the system optimizes the balance between achieving locked state and maintaining accurate phase error tracking under different channel conditions.
2Measurement precision
If the bandwidth of the phase recovery loop is decreased, then phase error tracking accuracy increases, but it becomes harder to achieve a locked state
Solution Approach 1:
The system dynamically adjusts the loop bandwidth based on detected phase noise characteristics. When phase noise is low, the system uses narrower bandwidth for accurate tracking; when phase noise is high, it switches to wider bandwidth to facilitate locking, thus resolving the contradiction between tracking accuracy and locking ease.
Solution Approach 2:
The patent changes the loop bandwidth parameter adaptively based on phase noise statistics (average and variance calculations). This dynamic parameter adjustment allows the system to optimize performance for different channel conditions, achieving both accurate tracking and easy locking when needed.
3Device complexity
If the bandwidth setting is based solely on absolute phase noise values, then the system is simple to implement, but it leads to inaccurate bandwidth settings in non-AWGN environments
Solution Approach 1:
The patent changes the parameters used for bandwidth setting from simple absolute phase noise values to statistical parameters (average and variance) of phase noise amounts. This provides more comprehensive information about channel conditions, enabling accurate bandwidth settings in complex non-AWGN environments while maintaining reasonable system complexity.
Solution Approach 2:
The system implements feedback by continuously monitoring phase noise characteristics and using this information to adjust the bandwidth setting. The phase error detector and loop filter work together with the bandwidth setting circuit to create a closed-loop system that adapts to changing channel conditions, improving bandwidth setting accuracy.
Data Source
AI summary
A signal receiving apparatus includes a phase recovery look, a phase estimation circuit, a phase noise detection circuit, and a bandwidth setting circuit. The phase recovery loop performs a phase recovery process on an input signal according to a bandwidth setting. The phase estimation circuit generates an estimated phase associated with the input signal. The phase noise detection circuit determines a phase noise amount according to the estimated phase. The bandwidth setting circuit calculates an average and a variance of the phase noise amounts, and adjusts the bandwidth setting of the phase recovery loop according to the average and the variance.