Distributed Antenna Host-Radio Link for Indoor Shadowing and Traffic
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Solution Overview
Problem
In indoor environments, such as buildings, radio signals are often blocked by objects, leading to shadowing areas where wireless communication is impossible or degraded, and existing distributed antenna systems face challenges in providing reliable and efficient wireless services due to traffic capacity issues.
Innovation Solution
A distributed antenna system comprising a host unit connected to a remote radio head and a radio unit, which includes digital and analog optical transceivers, digital signal processors, and analog front-end controllers to convert and adjust signals for optimal transmission and reception, minimizing shadowing areas by using point-to-point or point-to-multipoint configurations and optical cables for efficient wireless service delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single antenna covers a wide area, then the coverage area is large, but shadowing areas appear where communication is impossible
Solution Approach 1:
The patent divides a single large-area antenna system into multiple small distributed antennas. Each distributed antenna covers a limited local area, eliminating shadowing effects while collectively providing wide-area coverage. The host unit coordinates multiple radio units with small antennas to achieve both extensive coverage and reliable communication without dead zones.
2Reliability
If antennas are distributed at multiple locations to remove shadowing areas, then shadowing is minimized, but traffic capacity problems arise
Solution Approach 1:
The patent combines multiple distributed radio units with a centralized host unit to create a coordinated system. The host unit aggregates traffic from multiple radio units, enabling load balancing and efficient resource allocation. This merging approach allows the system to handle large wireless traffic while maintaining the benefits of distributed antenna coverage.
3Area of stationary object
If distributed antennas are installed to provide indoor coverage, then shadowing areas are removed, but device complexity increases
Solution Approach 1:
The host unit serves multiple functions: signal processing, coordination of radio units, traffic management, and system control. The radio units perform both transmission and reception functions. This multi-functionality reduces the need for separate dedicated components, simplifying the overall system architecture while providing comprehensive indoor coverage.
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
The system effectively supports large wireless transmission in indoor environments by minimizing shadowing areas and enhancing wireless service quality through efficient signal conversion and transmission, reducing network construction and operation costs while maintaining low latency.
Implementation Method 1
a digital optical transceiver configured to convert, to a digital electrical signal, a digital optical signal that is received through a downlink from the remote radio head to the host unit
Implementation Method 2
a digital-to-analog converter (DAC) configured to convert the baseband digital electrical signal to an analog electrical signal
Implementation Method 3
an analog optical transceiver configured to convert the combined analog electrical signal to an analog optical signal to transmit the combined analog electrical signal through a downlink from the host unit to the radio unit
Implementation Method 4
The analog optical transceiver may include a laser diode configured to directly convert the analog electrical signal to the analog optical signal based on an intermediate frequency
Data Source
AI summary
A host unit is provided between a remote radio head and a radio unit. The host unit performs a conversion between a digital optical signal used by the remote radio head and an analog optical signal used by the radio unit. A frequency of the analog optical signal converted by the host unit may be an intermediate frequency. The radio unit performs a conversion between an analog optical signal used by the host unit and an analog radio signal used by a user terminal. A frequency of the analog radio signal may be included in a millimeter wave band or radio frequency band.