Phase Variance Packet Detection in Multi-Carrier Modulation Systems
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Solution Overview
Problem
Existing Multi-Carrier Modulation (MCM) receiving systems face challenges in cost-effective carrier detection, particularly in low-power or low-cost systems, as correlation-based methods are computationally intensive and sensitive to noise and amplitude variations, making them unsuitable for applications like power line communication.
Innovation Solution
A method that involves obtaining phase variances of carriers over multiple symbol durations, computing a phase variance value, and comparing it to a threshold to detect packets, which is less sensitive to interfering harmonics and requires less computational power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If correlation-based carrier detection is used, then detection reliability is improved, but computational complexity and power consumption increase
Solution Approach 1:
The patent replaces the mechanical correlation computation with a phase-based detection method that measures phase differences and variances of carrier signals. This substitution eliminates the need for complex correlation calculations while maintaining detection reliability, directly addressing the contradiction between reliability and computational complexity.
Solution Approach 2:
The patent changes the detection parameter from correlation values to phase variance measurements. By monitoring phase differences and their variances across multiple symbols, the system achieves reliable carrier detection without computing correlations, thus reducing computational complexity while preserving reliability.
2Reliability
If correlation-based carrier detection is used, then detection reliability is improved, but power consumption increases
Solution Approach 1:
The patent substitutes power-intensive correlation computations with lighter phase-based measurements. By only measuring phase differences and variances rather than performing full correlation calculations, the system maintains detection reliability while significantly reducing power consumption.
Solution Approach 2:
The patent performs partial measurements (phase differences and variances) rather than complete correlation computations. This partial action approach provides sufficient detection reliability without the full computational burden, thereby reducing power consumption.
3Reliability
If correlation-based carrier detection is used, then detection reliability is improved, but sensitivity to noise and amplitude variations increases
Solution Approach 1:
The patent replaces correlation-based detection with phase-based measurement that is inherently more robust to noise and amplitude variations. By measuring phase differences and variances, the system maintains reliability while reducing sensitivity to harmful factors like noise and amplitude fluctuations.
Solution Approach 2:
The patent converts the potential harm of noise and amplitude variations into beneficial phase variance measurements. By measuring phase variances across multiple symbols, the system can actually detect and compensate for these variations, turning harmful factors into useful detection information.
Data Source
AI summary
A method is disclosed for detecting packet at a receiving system in a Multi-Carrier Modulation (MCM) system. The method starts with receiving a signal at the receiving system. Then during the plurality of symbol durations, a set of phases of the signal for each symbol duration is obtained, where each phase is a phase of a carrier of the number of carriers. Then a set of phase variances for each carrier of the number of carriers is obtained, where each phase variance is a difference of phases of a carrier in different symbol durations. Then a phase variance value based on the set of phase variances is computed and it is compared with a threshold to determine whether a packet has been detected from the received signal.