Base Station Phase Error Compensation for High-Speed Wireless Reception
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Solution Overview
Problem
Wireless communication systems face challenges in maintaining signal quality, particularly in extreme channel conditions such as high-speed travel, where mobile devices experience poor reception and inadequate signal strength due to rapid channel variations.
Innovation Solution
A computer-implemented method that involves detecting the angular position of symbols in a constellation, determining phase errors, and compensating the phase of symbols at a base station to enhance signal reception. This method includes receiving signals, detecting angular positions, determining phase errors, and compensating phases using components at Layer 1 of the base station, with the option to provide compensated phase information to Layer 2 for decoding, and repeating this process for each symbol to generate a cumulative angular difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If mobile devices travel at high speeds through extreme channel conditions, then coverage area and mobility are improved, but signal reception quality and phase stability deteriorate
Solution Approach 1:
The system performs preliminary phase error detection and compensation before decoding the received signal. By detecting angular positions of symbols in a constellation and determining phase errors in advance, the system prepares compensation values that are applied to correct the signal, ensuring reliable reception even under high-speed conditions
Solution Approach 2:
The system implements a feedback mechanism where phase errors are continuously detected by comparing actual symbol angular positions with expected reference positions, and compensation values are generated and applied iteratively. This closed-loop approach maintains signal quality despite rapid channel variations during high-speed travel
2Reliability
If phase compensation is performed for each symbol to improve reception quality, then signal quality improves, but processing complexity increases
Solution Approach 1:
The base station processes symbols individually or in small groups, detecting angular positions and determining phase errors for each symbol segment. This segmentation allows the complex compensation task to be broken down into manageable units, processing one symbol at a time while maintaining overall signal quality
Solution Approach 2:
The system changes the parameter being processed from raw signal values to angular positions in a constellation diagram. By transforming the problem into angular domain and using reference symbols for comparison, the processing becomes more systematic and manageable while achieving accurate phase error detection and compensation
Data Source
AI summary
A method, an apparatus and a computer program product for enhancing reception of signals in a wireless communication system. A signal containing a frame including a plurality of symbols is received on an uplink communication channel. An angular position of at least one symbol in the plurality of symbols in a constellation of symbols is detected. The plurality of symbols include equalized symbols. An angular difference corresponding a phase error between the detected angular position of the symbol and an expected reference angular position in the constellation of symbols corresponding to an expected reference symbol corresponding to the received frame is determined. Using the determined phase error, a phase of the symbol is compensated.