Noise Interference Power Estimation in Ranging Channels
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Solution Overview
Problem
In communication systems, the existing methods for estimating Noise and Interference (NI) power lead to an increase in false alarms as the Signal-to-Noise Ratio (SNR) increases, making it difficult to maintain a target false alarm probability, especially in environments with varying SNR conditions.
Innovation Solution
An apparatus and method that calculate and set the NI power by multiplying the average value of the impulse response corresponding to the (x+1)th peak value among arranged impulse responses by a specific threshold, where 'x' represents the number of simultaneously receivable ranging codes, to accurately estimate the NI power and reduce false alarms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing methods for estimating NI power are used, then the estimation process is simple, but the false alarm probability increases as SNR increases
Solution Approach 1:
The patent segments the impulse responses by sorting them in descending order and dividing into two groups: the first x impulse responses (corresponding to valid ranging codes) and the remaining N-x impulse responses. The NI power is estimated using only the (x+1)th impulse response, which belongs to the noise/interference group. This segmentation allows the system to exclude valid signal components from the NI estimation, thereby maintaining low false alarm probability even at high SNR conditions without significantly increasing computational complexity.
2Measurement precision
If the NI power estimation includes all impulse responses, then the estimation uses all available data, but the false alarm rate increases due to inclusion of valid ranging code signals
Solution Approach 1:
The patent extracts and excludes the first x impulse responses (which correspond to valid ranging codes) from the NI power estimation process. By taking out these valid signal components and estimating NI power only from the remaining N-x impulse responses (starting with the (x+1)th), the method ensures that the NI estimation is not contaminated by actual ranging signals, thereby maintaining measurement precision and reducing false alarm probability.
3Ease of operation
If a fixed threshold is used for NI power, then the detection is simple, but the system cannot adapt to varying SNR conditions
Solution Approach 1:
The patent implements a dynamic NI power estimation that automatically adapts to varying SNR conditions. Instead of using a fixed threshold, the system dynamically determines the NI power by identifying the (x+1)th impulse response in the sorted sequence and multiplying by a threshold factor. This dynamic approach allows the NI estimation to automatically adjust to the current channel conditions and SNR level, maintaining detection performance across different operating environments while preserving operational simplicity.
Data Source
AI summary
An apparatus and a method for estimating a Noise and Interference (NI) power in a communication system are provided. The method includes, calculating average values of impulse responses according to ranging codes, through use of a ranging signal sequence received through a resource allocated to a ranging channel, arranging the average values of the impulse responses according to ranging codes in order of the highest value to the lowest value, and multiplying a ranging code, which corresponds to an impulse response having an (x+1)th peak value among the arranged average values of the impulse responses, by a specific threshold value, and estimating the NI power, wherein “x” represents a number of ranging codes which can be simultaneously received by one ranging channel.