Cyclic Prefix Power Adjustment for Burst Frame Signal Magnification
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Solution Overview
Problem
In burst frame systems, the receiving end faces challenges in accurately adjusting signal power magnification due to limitations in Analog to Digital Converter (A/D) bit bandwidth, leading to significant power fluctuations and requirements for high precision in automatic gain control.
Innovation Solution
A power adjusting method and apparatus that detects and acquires the power of cyclic prefix signals through multiple sampling points, determining ratios to target power and adjusting signal power magnification accordingly to ensure the receiving power is within preset thresholds, thereby improving the accuracy of signal power adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If automatic gain control is performed on received signals in burst frame systems, then signal power magnification is achieved, but measurement precision deteriorates due to A/D converter bit bandwidth limitations
Solution Approach 1:
The patent applies preliminary action by measuring the power of the cyclic prefix signal before the actual data signal is received. This preliminary measurement allows the system to calculate the required gain in advance and adjust the A/D converter's sampling rate accordingly, ensuring accurate power magnification without waiting for the data signal to arrive.
Solution Approach 2:
The patent implements dynamics by dynamically adjusting the A/D converter's sampling rate based on the measured cyclic prefix signal power. When the signal power is strong, the sampling rate is reduced; when the signal power is weak, the sampling rate is increased. This dynamic adjustment optimizes the balance between measurement precision and processing efficiency.
2Measurement precision
If A/D converter sampling rate is increased to improve power measurement accuracy, then measurement precision improves, but device complexity and processing load increase
Solution Approach 1:
The system dynamically adjusts the A/D converter's sampling rate based on real-time power measurements of the cyclic prefix signal. This dynamic configuration allows the system to use higher sampling rates only when necessary (when signal power is weak), avoiding unnecessary complexity during normal operation.
Solution Approach 2:
The patent changes the sampling rate parameter of the A/D converter based on the measured signal power. By adjusting this key parameter dynamically, the system achieves high measurement precision when needed while maintaining simpler operation during normal conditions, effectively resolving the contradiction between precision and complexity.
Data Source
AI summary
A power adjusting method and apparatus provided by embodiments of the present invention relate to the field of communications. The power adjusting method of this embodiment includes: receiving a signal from a sending end, where the signal includes a cyclic prefix (CP) signal; detecting and acquiring first receiving power and second receiving power of the CP signal, where the first receiving power is average power of N sampling points of the CP signal, and the second receiving power is average power of M sampling points of the CP signal; after determining that a ratio of the first receiving power to target power is greater than a first preset threshold, adjusting signal power magnification; and after determining that the ratio of the second receiving power to the target power is greater than a second preset threshold, adjusting the signal power magnification again.