EHF Distributed Antenna Base Unit for HD Video
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Solution Overview
Problem
Conventional distributed antenna systems, particularly those using WiFi or WLAN, struggle to provide sufficient bandwidth for high-definition video services due to limited bandwidth, leading to substantial degradation in video quality, especially in areas with poor cellular coverage.
Innovation Solution
The implementation of extremely high frequency (EHF) distributed antenna systems operating in the 30-300 GHz band, specifically at 60 GHz with 7 GHz bandwidth channels, to support digital data services by using a base unit that converts electrical data signals into modulated optical signals for transmission to remote antenna units, enabling higher bandwidth and reduced video quality degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If WiFi or WLAN technology is used for distributed antenna systems, then wireless digital data services can be provided within buildings, but the bandwidth is insufficient for high-definition video services
Solution Approach 1:
The patent transitions from conventional WiFi/WLAN frequency bands to the millimeter-wave band (30-300 GHz), specifically targeting 60 GHz with 7 GHz bandwidth channels. This parameter change in operating frequency enables significantly higher bandwidth capacity while maintaining reliable video quality transmission for HD services
2Ease of operation
If conventional distributed antenna systems are deployed in indoor environments, then wireless coverage is provided, but bandwidth limitations cause substantial degradation in video quality
Solution Approach 1:
The system deploys millimeter-wave frequency (60 GHz) with wide bandwidth channels (7 GHz) specifically optimized for indoor distributed antenna applications. This parameter change provides both comprehensive wireless coverage and sufficient bandwidth for high-definition video without quality degradation
3Productivity
If HD video is transmitted over current wireless standards, then digital data services can be provided, but substantial degradation occurs in video quality
Solution Approach 1:
The patent implements millimeter-wave communication at 60 GHz with 7 GHz bandwidth channels, enabling uncompressed high-definition video transmission. This parameter change provides both the data service capability and video quality reliability required for HD video applications
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution provides greater bandwidth for digital data services, allowing for the efficient transmission of uncompressed high-definition video without significant quality degradation, even in indoor environments with limited cellular coverage, outperforming directly-modulated mm-wave radio over fiber systems.
Implementation Method 1
The base unit comprises an electrical-to-optical (E-O) converter configured to convert the downlink electrical data signal into a downlink optical data signal
Implementation Method 2
The modulator is configured to combine the downlink optical data signal with the electrical carrier signal to form a downlink modulated optical signal comprising the downlink optical data signal modulated at the center frequency of the electrical carrier signal
Data Source
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AI summary
Extremely High Frequency (EHF) distributed antenna systems and related components and methods are disclosed. In one embodiment, a base unit for distributing EHF modulated data signals to a RAU(s) is provided. The base unit includes a downlink data source input configured to receive downlink electrical data signal(s) from a data source. The base unit also includes an E-O converter configured to convert downlink electrical data signal(s) into downlink optical data signal(s). The base unit also includes an oscillator configured to generate an electrical carrier signal at a center frequency in the EHF band. The base unit also includes a modulator configured to combine the downlink optical data signal(s) with the electrical carrier signal to form downlink modulated optical signal(s) comprising a downlink optical data signal(s) modulated at the center frequency of the electrical carrier signal. The modulator is further configured to send the downlink modulated optical signal to the RAU(s).