Multi-Carrier Digital Power Control for GSM Base Stations
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Solution Overview
Problem
Existing multi-carrier GSM base station power control methods are complex and lack precision due to the need for separate processing of each carrier signal and the impact of analog devices on closed-loop power control.
Innovation Solution
A multi-carrier closed-loop power control device and method that performs digital up-conversions, analog channel gain flatness compensation, and combines signals digitally, avoiding separate carrier processing and analog limitations, using digital up-converters, multipliers, and A/D converters to enhance precision and reduce complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If each carrier signal is separated and subjected to closed-loop power control respectively, then power control precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple carrier signals into a single multi-carrier signal and performs unified closed-loop power control on the combined signal rather than separating and controlling each carrier individually. This merging approach maintains power control precision while significantly reducing processing complexity by eliminating the need for separate processing paths for each carrier.
2Speed
If feedback comparison and closed-loop power control are implemented in the analog part, then processing speed is improved, but measurement precision deteriorates due to analog device characteristics
Solution Approach 1:
The patent replaces the analog feedback comparison and closed-loop power control system with a digital implementation. By using digital signal processing for feedback comparison and power control adjustments, the system eliminates the precision limitations of analog devices while maintaining fast processing speeds through efficient digital algorithms.
3Area of stationary object
If static power level is set for the base station, then coverage area is determined, but adaptability deteriorates when transmission power needs adjustment
Solution Approach 1:
The patent implements dynamic power control that allows the base station transmission power to be continuously adjusted based on feedback from the multi-carrier signal quality. This dynamic approach enables the coverage area to be adaptively changed according to network conditions, replacing the fixed static power level setting with a flexible, real-time controllable system.
Data Source
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AI summary
A multi-carrier closed-loop power control device is disclosed. A downlink digital processing module is configured to obtain a first multi-carrier digital signal and perform closed-loop power compensation on the first multi-carrier digital signal by using a multi-carrier feedback digital signal to obtain a second multi-carrier digital signal. A feedback analog channel module is configured to obtain the multi-carrier feedback digital signal form a multi-carrier output signal which is obtained by processing the second multi-carrier digital signal in the analog domain. A corresponding method is also disclosed. According to the solutions, closed-loop power compensation may be directly applied to the obtained first multi-carrier digital signal at the digital part to obtain the second multi-carrier digital signal, without separating each carrier signal, which reduces complexity of the multi-carrier closed-loop power control. Disadvantages due to performing closed-loop power control at the analog part are avoided, thus improving precision of multi-carrier power control.