Synchronization Signal Detection via Strong Interference Cancellation
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Solution Overview
Problem
In communication systems, especially in LTE, the synchronization process is hindered by interference from base stations with stronger signal transmission power, leading to performance deterioration in symbol and frame synchronization, and subsequent cell identification detection.
Innovation Solution
An electronic device receives signals from adjacent base stations, detects synchronization signals, estimates signals corresponding to these signals, and eliminates the strongest signal to detect synchronization signals from base stations with different symbol boundaries, thereby reducing interference and improving synchronization performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the synchronization system searches for symbol and frame synchronization by cell identification in a multi-base station environment, then the terminal can obtain cell ID information, but the search process is influenced by base stations with strong transmission power causing search failure and performance deterioration
Solution Approach 1:
The patent converts the harmful effect of strong interference signals into a beneficial detection mechanism. By using the strong signal's characteristics (cyclic prefix structure) to identify and eliminate it, the system turns the interference problem into a solution pathway where the strongest signal becomes the reference for cancellation rather than just a nuisance to be filtered.
Solution Approach 2:
The patent extracts and removes the dominant interference signal from the received signal mixture. Through detecting the strongest signal's parameters (cyclic prefix length, timing) and subtracting it from the total received signal, the system isolates and eliminates the harmful component, allowing weaker synchronization signals to be detected without interference.
2Adaptability or versatility
If the system detects synchronization signals from multiple base stations simultaneously, then comprehensive cell identification is achieved, but accurate symbol synchronization estimation cannot be achieved due to time difference of reception and cyclic prefix interference
Solution Approach 1:
The patent segments the synchronization detection process into distinct phases: first detecting and eliminating the strongest signal, then detecting the second strongest signal, and finally performing synchronization estimation. This segmentation allows the system to handle multiple base stations by processing them sequentially rather than simultaneously, preventing interference between detections.
Solution Approach 2:
The patent performs preliminary detection and elimination of strong interference signals before attempting symbol synchronization estimation. By identifying and removing the dominant signals in advance (through strongest and second strongest signal detection), the system prepares a cleaned signal environment that enables accurate subsequent synchronization measurements.
Data Source
AI summary
A method of an electronic device is provided. The method includes receiving signals from adjacent base stations comprising a first base station and a second base station, respectively, detecting a first synchronization signal and a second synchronization signal for the first base station among the received signals, estimating a first signal corresponding to the detected first synchronization signal and second synchronization signal, eliminating the first signal among the signals received from the adjacent base stations, and detecting a second signal for the second base station.