Digital Signal Summer for Distributed Antenna Systems
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Solution Overview
Problem
In distributed antenna systems (DAS), there is a need for an efficient method to sum downlink digital signals from different sub-bands within the same service band, particularly when these signals are transmitted from multiple main units to a hub unit.
Innovation Solution
The proposed solution involves a hub apparatus and a method for summing digital downlink signals in a DAS. This method includes a signal input unit, a band extractor, a signal summer, and a reformatter, which work together to extract sub-band signals and digitally sum them within the same service band, improving transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple MUs transmit different sub-band signals to a single HUB, then signal coverage and system capacity are improved, but signal summing complexity and transmission efficiency deteriorate
Solution Approach 1:
The patent segments the service band into multiple sub-bands and processes each sub-band signal separately through dedicated extraction units. This segmentation allows complex multi-MU signal summing to be decomposed into simpler, independent sub-band processing tasks, reducing overall signal summing complexity while maintaining coverage from multiple MUs.
Solution Approach 2:
The patent introduces a HUB as an intermediary device that receives sub-band signals from multiple MUs, performs coordinated summing operations, and forwards the combined signals to RUs. This intermediary structure manages the complexity of multi-MU signal integration centrally, improving both coverage coordination and transmission efficiency.
2Adaptability or versatility
If multiple MUs transmit different sub-band signals to a single HUB, then system capacity is improved, but digital transmission efficiency deteriorates
Solution Approach 1:
By segmenting signals into sub-bands and processing them independently, the system can efficiently handle multiple MUs' transmissions without overwhelming the digital transmission channel. Each sub-band signal is extracted and summed separately, optimizing transmission efficiency while maintaining high system capacity.
Solution Approach 2:
The patent changes the frequency domain parameters by dividing the service band into sub-bands. This parameter transformation allows efficient digital signal processing and summing operations, improving digital transmission efficiency while supporting multiple MUs and maintaining high system capacity.
3Ease of operation
If a HUB is introduced to connect multiple MUs and RUs, then installation flexibility is improved, but signal transmission complexity worsens
Solution Approach 1:
The HUB serves as a centralized intermediary that simplifies installation by providing a single connection point for multiple MUs and RUs. While the HUB introduces signal processing complexity, this is managed through automated sub-band extraction and summing algorithms, maintaining installation flexibility while controlling transmission complexity.
Solution Approach 2:
The HUB is designed as a multi-functional device that performs signal reception, sub-band extraction, signal summing, and transmission to multiple RUs. This universal design consolidates multiple functions into a single device, improving installation flexibility while managing signal transmission complexity through integrated processing.
Data Source
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AI summary
There is provided a distributed antenna system includes a plurality of head-end units for receiving mobile communication signals from different base stations, a hub unit connected to each of the plurality of head-end units through a transport medium, the hub unit distributing mobile communication signals respectively received from the plurality of head-end units to a plurality of remote units branch-connected thereto through a transport medium, and the plurality of remote units remotely positioned to transmit the mobile communication signals to a terminal in a service coverage, wherein the hub unit includes a signal summer configured to digitally sum different sub-band signals in the same mobile communication service band, received from the plurality of head-end units.