False Channel Detection in Wireless Acquisition
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Solution Overview
Problem
Wireless communication devices using crystal oscillators (XOs) face challenges in accurately detecting false channels due to large frequency errors, leading to inefficient resource utilization and prolonged processing times.
Innovation Solution
The technique involves generating LO signals and sampling clocks from an XO signal, with frequency acquisition and time tracking to determine if a detected peak corresponds to a desired or false channel, based on the movement of the peak, allowing for quick detection and correction of frequency errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a crystal oscillator (XO) is used to reduce complexity and cost, then device complexity and cost are reduced, but frequency error increases causing false channel acquisition
Solution Approach 1:
The patent applies preliminary action by performing false channel detection during the frequency acquisition phase before full signal processing begins. The system detects whether the acquired channel is false by monitoring peak movement characteristics during initial acquisition, allowing early rejection of false channels and preventing wasted processing resources on invalid acquisitions.
2Reliability
If frequency acquisition and time tracking are performed to correct frequency error, then frequency accuracy is improved, but processing time increases
Solution Approach 1:
The patent extracts the false channel detection function from the full signal processing pipeline, implementing it as a separate detection mechanism that operates during acquisition phase. By isolating this detection function, the system can quickly identify false channels without completing the entire processing sequence, thereby reducing overall processing time while maintaining frequency accuracy through targeted correction only when needed.
3Productivity
If the system processes false channels, then acquisition completeness is improved, but resource utilization deteriorates
Solution Approach 1:
The patent implements feedback by continuously monitoring peak movement characteristics during acquisition and using this information to determine whether the acquired channel is valid. The system feeds back the detection results to control further processing, allowing it to reject false channels early and allocate resources only to valid acquisitions, thereby improving resource utilization while maintaining acquisition completeness through systematic verification.
Data Source
AI summary
Techniques for detecting acquisition of a false channel in a wireless communication system are described. For false channel detection, a peak corresponding to a signal from a base station is initially detected. Frequency acquisition and time tracking of the peak are then performed. The frequency acquisition attempts to determine and correct downconversion frequency error. The time tracking attempts to follow the peak as it moves due to sample timing error and/or changes in channel conditions. Whether the signal is from a desired frequency channel or a false frequency channel is determined based on the time tracking. If a false channel is acquired, then the sampling timing will be either too slow or too fast, and the peak will move at a fast rate. A false channel may be detected based on the movement of the peak.