EHF Distributed Antenna System Using Optical Modulation 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 channel capacity, leading to substantial degradation in video quality.
Innovation Solution
The implementation of extremely high frequency (EHF) distributed antenna systems operating in the 30-300 GHz band, specifically using 60 GHz with 7 GHz bandwidth channels, which enables the transmission of more data-intensive signals like uncompressed HD video without significant quality degradation, by converting electrical data signals into optical signals and modulating them with an EHF carrier signal for distribution to remote antenna units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If WiFi or WLAN-based distributed antenna systems are used, 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 unlicensed 60 GHz EHF band, changing the fundamental frequency parameter to access wider bandwidth channels (7 GHz channel bandwidth) that can carry uncompressed or minimally compressed HD video signals
Solution Approach 2:
The patent introduces a new dimensional approach by utilizing the EHF spectrum dimension (30-300 GHz, specifically 60 GHz) that was previously underutilized for indoor wireless communications, providing an additional bandwidth dimension beyond traditional 2.4 GHz and 5 GHz WiFi bands
2Quantity of substance
If conventional distributed antenna systems operate in traditional frequency bands, then system complexity remains manageable, but the channel bandwidth is limited
Solution Approach 1:
The patent employs optical fiber as an intermediary transmission medium to carry 60 GHz RF signals from remote antenna units to the head end, enabling long-distance signal distribution with minimal loss and allowing the system to scale to multiple floors and buildings without proportionally increasing complexity
Solution Approach 2:
The patent replaces traditional coaxial cable or wireless backhaul mechanisms with optical fiber transmission, substituting a more advanced transmission medium that provides superior bandwidth, lower attenuation, and higher scalability for distributing EHF signals
3Quantity of substance
If EHF signals are transmitted through optical fiber, then bandwidth is significantly increased, but signal conversion complexity increases
Solution Approach 1:
The patent extracts the RF modulation and demodulation functions from the optical fiber transmission path, using direct modulation of the 60 GHz carrier signal onto optical carriers at the remote antenna units, thereby simplifying the overall system by removing complex intermediate frequency conversions
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 approach supports the provision of high-bandwidth digital data services within indoor environments, effectively delivering HD video and other data-intensive content without substantial quality loss, outperforming traditional systems in terms of bandwidth and signal integrity.
Implementation Method 1
an electrical-to-optical (E-O) converter configured to convert the downlink electrical data signal into a downlink optical data signal
Implementation Method 2
a modulator 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
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).