OFDM Null Sub-Carrier Interference Detection Without Throughput Loss
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in detecting interference signals, leading to degradation of data transmitting efficiency due to low tracking with varying transmission lines.
Innovation Solution
A wireless communication system that employs error correction coding and selects null sub-carriers with zero amplitude for data transmission, allowing the receiver to detect interference signals without degrading data efficiency, by dynamically allocating and adjusting null sub-carriers based on interference detection and transmission path characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If null sub-carriers are deliberately added to transmitting data for interference detection, then interference signal detection capability is improved, but data transmitting efficiency is degraded
Solution Approach 1:
The patent makes transmitting data serve dual purposes: carrying information and enabling interference detection. By processing existing transmitting data to generate null sub-carriers rather than adding separate detection signals, the system achieves interference detection without sacrificing data transmission efficiency.
Solution Approach 2:
The transmitting data itself is used to generate the null sub-carriers needed for interference detection. The system serves its own detection needs through self-processing of its transmission signals, eliminating the requirement for additional dedicated detection resources.
2Measurement precision
If measurement signals are deliberately added for interference detection, then interference signal detection capability is improved, but data transmitting efficiency is degraded
Solution Approach 1:
The patent extracts null sub-carriers from the transmitting data through processing (FFT transformation and threshold comparison) rather than adding separate measurement signals. This extraction approach allows interference detection to be performed using existing transmission resources.
Solution Approach 2:
The transmitting data serves multiple functions simultaneously: information transmission and interference detection. By making the data serve dual purposes, the system avoids the efficiency loss that would result from adding dedicated measurement signals.
3Device complexity
If null sub-carriers are fixed in position, then system complexity is reduced, but adaptability to varying transmission lines is degraded
Solution Approach 1:
The patent makes the null sub-carrier positions dynamic by changing them in each time slot according to transmission line conditions. This dynamic adjustment allows the system to adapt to varying transmission environments while maintaining relatively simple implementation through systematic position variation.
Solution Approach 2:
The null sub-carrier positions are changed periodically in each time slot, providing regular updates that improve tracking capability with varying transmission lines while maintaining a predictable, manageable pattern rather than completely random changes.
Data Source
AI summary
In a wireless communication system including a transmitter device and a receiver device used for transmission of wireless signals having a plurality of sub-carriers, the transmitter device performs error correction coding on transmitting data and selects at least one of the plurality of sub-carriers used for transmission of error-correction coded data as a null sub-carrier having zero amplitude, thus transmitting the error-correction coded data, while the receiver device receives signals having the plurality of sub-carriers from the transmitter device so as to retrieve original transmitted data by implementing error correction decoding on received signals, thus determining whether an interference wave occurs in the sub-carrier upon detecting reception power exceeding a predetermined threshold in the sub-carrier serving as the null sub-carrier.