Interference Detector for Wireless Systems Using Partial Frequency Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current LTE systems face challenges in accurately determining interference type in unlicensed bands, leading to inefficient coexistence with WiFi due to mismatches in long-term statistics and preamble detection methods, which result in inaccurate channel condition assessment and increased complexity.
Innovation Solution
An interference detector that analyzes a partial frequency resource of the received signal to derive the interference type using a predetermined sequence of modulation symbols or zero-power resource elements, allowing for accurate detection without requiring time-domain analysis and minimizing transmission impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If long term statistics (e.g., RSRP measurement) are used to identify interference type, then the detection method is simple, but the accuracy of interference type identification is poor due to mismatch between long term statistics and practical interference type
Solution Approach 1:
The patent applies preliminary action by transmitting a preamble signal before the actual data transmission. This preamble serves as a pre-configured reference that enables the receiving node to accurately identify the interference type in advance, resolving the mismatch between long-term statistics and actual interference conditions.
Solution Approach 2:
The patent introduces an intermediary approach by using a dedicated preamble signal as a mediator between the transmitting node and the receiving node. This preamble acts as a reference marker that facilitates accurate interference type identification without requiring complex long-term statistical analysis.
2Measurement precision
If WiFi preamble detection is used to identify interference type, then the accuracy improves, but the complexity increases due to need for preamble transmission and detection support
Solution Approach 1:
The patent applies segmentation by separating the interference type identification function into a dedicated preamble signal portion. This allows the main data transmission to remain simple while the preamble handles the complex identification task, reducing overall system complexity.
Solution Approach 2:
The patent uses a simplified copy approach by creating a preamble signal that replicates the essential identification function without requiring full WiFi protocol support. This enables interference type detection with reduced complexity compared to complete WiFi preamble detection.
3Measurement precision
If WiFi-like preamble is transmitted and detected to identify interference type, then interference type can be determined, but the transmission time is increased and CCA accuracy is affected
Solution Approach 1:
The patent applies partial action by transmitting only the necessary preamble information needed for interference type identification, rather than complete WiFi preambles. This reduces transmission time while maintaining sufficient accuracy for CCA decisions.
Solution Approach 2:
The patent uses the skipping principle by rapidly transmitting the interference type identification information through a condensed preamble signal. This allows quick determination of interference type without the time-consuming procedures of full WiFi preamble transmission and detection.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to an interference detector for a wireless communication system, wherein the interference detector is configured to receive a signal of the wireless communication system; and derive an interference type from an interference label in a partial frequency resource of the received signal.