Frequency Domain Equalization for PDM OFDM Signals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current technologies lack an efficient method for electronic equalization and depolarization in PDM OFDM systems, particularly due to high complexity in computation and hardware requirements when performed in the time domain.
Innovation Solution
Converting received time domain signals into frequency domain signals, detecting a Synchronization Sequence to obtain control signals, and calculating parameters for electronic equalization and depolarization, which are then applied to the frequency domain signals to perform equalization and depolarization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electronic equalization and depolarization are performed in the time domain, then the processing can be completed, but the computation complexity and hardware requirements become excessively high
Solution Approach 1:
The patent transforms the equalization and depolarization operations from the time domain to the frequency domain by changing the parameter domain. This is achieved through FFT conversion, where the complex time-domain filtering operations are converted to simpler frequency-domain multiplications, dramatically reducing computational complexity while maintaining processing effectiveness
Solution Approach 2:
The patent replaces the mechanical/time-domain filtering approach with a frequency-domain mathematical approach. Instead of performing complex convolution operations in the time domain, the system uses FFT to convert signals to frequency domain, where equalization and depolarization are achieved through simpler algebraic operations, substituting mechanical processing with mathematical transformation
2Reliability
If electronic equalization and depolarization are performed in the time domain, then signal processing can be achieved, but the hardware requirements become excessively high
Solution Approach 1:
The patent changes the operational parameter domain from time to frequency, enabling the same signal processing functions to be performed with reduced hardware complexity. The frequency-domain representation allows equalization and depolarization to be implemented through simpler computational blocks, reducing hardware requirements while preserving signal processing capability
3Device complexity
If frequency domain processing is used for electronic equalization and depolarization, then computation complexity is reduced, but additional signal transformation steps are required
Solution Approach 1:
The patent applies parameter domain transformation from time to frequency using FFT, which reduces computation complexity of equalization and depolarization operations. Although additional transformation steps are introduced, the overall processing efficiency is improved because the frequency-domain operations are computationally less intensive than equivalent time-domain convolution operations
Solution Approach 2:
The patent substitutes time-domain mechanical filtering with frequency-domain mathematical operations. The FFT-based approach replaces complex time-domain signal processing with efficient frequency-domain multiplications, achieving lower computation complexity while maintaining or improving overall processing efficiency
Data Source
AI summary
Embodiments of the present invention disclose an electronic equalization and electronic depolarization method, a receiving end equipment, and a communication system. According to the embodiments of the present invention, parameters required by electronic equalization and electronic depolarization are calculated by detecting a Synchronization Sequence (SS) in a received signal, and then the electronic equalization and the electronic depolarization are performed on the received signal in a frequency domain by utilizing the parameters, so as to solve a problem of the electronic equalization and the electronic depolarization in a Polarization Division Multiplexing (PDM) Orthogonal Frequency Division Multiplexing (OFDM) system. Furthermore, the realization complexity of the electronic equalization and the electronic depolarization performed in the frequency domain is greatly reduced relative to the electronic equalization and the electronic depolarization performed in a time domain.