Gaussian White Noise Power Estimation in WCDMA Channels
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Solution Overview
Problem
Existing systems fail to accurately estimate Gaussian white noise power in channels due to inter-path interference, leading to performance loss in LMMSE equalization.
Innovation Solution
A method and device that perform multi-path search, noise estimation, and inter-path interference noise estimation to subtract inter-path interference noise from total noise power, thereby obtaining accurate Gaussian white noise power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the existing method derives Gaussian white noise power by removing signal from subtraction result of former and latter symbols, then the estimation process is simple, but the obtained noise power contains inter-path interference noise power instead of pure Gaussian white noise power
Solution Approach 1:
The patent segments the total noise power into two distinct components: inter-path interference noise power and pure Gaussian white noise power. By performing separate estimations for each component and then subtracting the inter-path interference noise power from the total noise power, the method isolates the pure Gaussian white noise power, thereby resolving the contradiction between simple process and accurate measurement.
Solution Approach 2:
The patent extracts the inter-path interference noise power component from the total noise power by estimating it separately through channel estimation on paths spaced by integral number of chips. This extracted component is then removed from the total noise power to obtain the pure Gaussian white noise power, addressing the accuracy issue while maintaining reasonable complexity.
2Measurement precision
If channel estimation is performed on paths spaced apart by integral number of chips to estimate inter-path interference noise power, then the Gaussian white noise power accuracy is improved, but the computational complexity increases
Solution Approach 1:
The patent applies local quality by performing channel estimation only on specific paths spaced apart by integral number of chips, rather than all paths. This selective approach estimates the inter-path interference noise power with sufficient accuracy while minimizing the computational burden, thus balancing accuracy and complexity.
Solution Approach 2:
The patent performs partial action by estimating inter-path interference noise power using only a subset of paths (those spaced by integral number of chips) rather than analyzing all available paths. This partial estimation provides adequate accuracy for the Gaussian white noise power calculation while significantly reducing computational complexity compared to a complete analysis.
Data Source
AI summary
A method and device for estimating a Gaussian white noise power in a channel and a receiver are provided. The method includes performing a multi-path search on a received signal to find out paths of the signal; performing a noise estimation on one of the paths to acquire a total noise power of the path; performing an inter-path interference noise estimation on N paths spaced apart from the path by an integral number of chips to obtain an inter-path interference noise power of a single path of the signal, where N is an integer greater than or equal to 1; and subtracting the inter-path interference noise power from the total noise power to obtain the Gaussian white noise power. Through the technical solution of the disclosure, the Gaussian white noise power in a channel is obtained with a higher accuracy, so that the performance of equalization is enhanced.