OFDM Signal Detection via Trial Sequence Minimization
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Solution Overview
Problem
Conventional OFDM communication systems face high complexity and error performance degradation due to the need for multiple steps in channel estimation, interpolation, equalization, and detection, which reduces spectral efficiency and increases power consumption in mobile devices.
Innovation Solution
A method and system that estimates transmitted signals by generating trial sequences to minimize the channel response between adjacent received signals, eliminating the need for channel estimation, interpolation, and equalization, and using the Viterbi Algorithm for efficient sequence detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional channel estimation, interpolation, equalization and detection steps are used in OFDM systems, then reliable signal detection can be achieved, but computational complexity increases and spectral efficiency decreases
Solution Approach 1:
The patent combines channel estimation, equalization, and detection into a single integrated operation. Instead of performing these as separate sequential steps, the invention formulates a unified optimization problem that simultaneously estimates channel parameters and detects transmitted symbols, thereby reducing computational complexity while maintaining detection reliability
Solution Approach 2:
The patent segments the received signal into multiple observations and forms a likelihood ratio test based on segmented signal analysis. This segmentation approach allows the system to achieve reliable detection with reduced computational burden by processing signals in a structured manner rather than requiring full conventional processing chains
2Measurement precision
If conventional channel estimation and equalization steps are performed, then signal accuracy can be maintained, but spectral efficiency is reduced due to overhead requirements
Solution Approach 1:
The patent employs a self-service approach where the detection process itself generates channel estimation information as a byproduct. The likelihood ratio test inherently utilizes channel information without requiring separate pilot symbols or explicit channel estimation steps, thereby eliminating the spectral efficiency overhead associated with conventional channel estimation while maintaining signal accuracy
Solution Approach 2:
The invention creates a multi-functional detection mechanism that simultaneously performs channel estimation, equalization, and symbol detection in a single operation. This universal approach eliminates the need for separate processing steps and their associated overhead, improving spectral efficiency while maintaining the accuracy benefits of conventional methods
Data Source
AI summary
There is provided a computer-implemented method of estimating transmitted signals in a communication system, the signals being transmitted by a transmitter to a receiver over a communication channel having a channel response, the method comprising estimating the transmitted signals based on generated trial sequences minimizing the channel response between adjacent received signals. There is also provided a receiver, a signal detector device and a communication system adapted to estimated transmitted signals in a communication system by generating trial sequences and determining the generated trial sequences minimizing the channel response between adjacent received signals. The present invention is particularly adapted for OFDM communication systems.