Distributed Antenna System Wavelet Signal Processing
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Solution Overview
Problem
Existing distributed antenna systems face inefficiencies in transmission due to data redundancy and difficulties in analyzing individual digital radio frequency signals, leading to poor transmission efficiency and stability issues.
Innovation Solution
A distributed antenna system that employs a master unit and remote units performing bidirectional digital radio frequency signal distribution in a wavelet transform domain, allowing for signal normalization, merging, and compression, with a hub unit relaying signals to improve efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If digital radio frequency signals are transmitted through optical fiber network in time domain, then signal distribution is achieved, but transmission efficiency deteriorates due to data redundancy
Solution Approach 1:
The patent transforms digital radio frequency signals from time domain to wavelet transform domain, changing the parameter representation from temporal sequences to wavelet coefficients. This transformation eliminates data redundancy by representing signals in a more compact form where only significant coefficients need to be transmitted, thereby improving transmission efficiency while reducing redundant data transmission.
2Ease of operation
If digital radio frequency signals are transmitted through optical fiber network, then signal distribution is achieved, but analysis of individual digital radio frequency signals becomes difficult
Solution Approach 1:
By transforming signals to wavelet domain, the patent changes the analysis parameters from time-domain waveforms to frequency-time localized wavelet coefficients. This makes it easier to analyze individual digital radio frequency signals because wavelet coefficients provide both frequency and temporal information, enabling better signal characterization and fault detection without excessive processing complexity.
3Productivity
If wavelet transform is applied to digital radio frequency signals, then transmission efficiency is improved, but latency increases due to additional calculations
Solution Approach 1:
The patent applies wavelet transform with selective thresholding, performing the transformation only to the extent necessary for compression. By using threshold-based coefficient selection, the system performs partial wavelet transform operations, keeping only the most significant coefficients for transmission. This reduces the computational burden and associated latency while still achieving the transmission efficiency benefits of wavelet domain processing.
4Reliability
If master unit determines normality of digital radio frequency signals from multiple remote units, then signal quality is improved, but processing complexity increases
Solution Approach 1:
The master unit determines signal normality by analyzing wavelet coefficients rather than complete time-domain signals. This parameter change from analyzing full signals to analyzing transformed coefficients reduces the data volume requiring processing while maintaining or improving signal quality assessment accuracy. The wavelet domain representation allows for more efficient comparison and anomaly detection across multiple remote units.
Data Source
AI summary
A technology related to a distributed antenna system is disclosed. In an exemplary embodiment, a distributed antenna system may include a master unit and a plurality of remote units. The master unit may be interfaced with a wireless communications network and perform a bidirectional simultaneous digital radio frequency distribution of a wireless signal. The plurality of remote units may be each coupled to the master unit, and each perform a wireless transmission or reception of a split radio frequency signal to or from terminals located within a coverage. The master unit and the plurality of remote units may transmit or receive digital radio frequency signals in a wavelet transform domain. The master unit may determine whether the digital radio frequency signal, transmitted by each of the remote units, is normal, and merge the digital radio frequency signals.