Microwave Backhaul System Quadruple Capacity Design
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Solution Overview
Problem
Conventional microwave backhaul architectures face limitations in capacity and bandwidth due to the use of single channel coaxial interconnects, which are expensive and prone to signal loss, making it difficult to meet increasing demands for high-capacity IP/Ethernet connections, especially with the transition to 4G and LTE networks.
Innovation Solution
A quadruple capacity microwave backhaul system is implemented using dual channel processing modules and transmitter/receiver modules that enable the transmission and reception of four channels over two coaxial cables, each carrying two channels, with adaptive coding and modulation to manage channel changes and improve reliability in adverse weather conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single channel coaxial interconnect is used to transmit analog signals between IDU and ODU, then the system structure is simple, but the bandwidth is limited and signal loss occurs under certain conditions
Solution Approach 1:
The patent divides the single coaxial interconnect into multiple coaxial interconnects (first and second coaxial interconnects), allowing separate transmission paths for different channels. This segmentation increases total bandwidth capacity and reduces signal loss by distributing traffic across multiple physical paths rather than overloading a single channel.
2Productivity
If conventional split ODU configuration with single channel coaxial interconnect is used, then device complexity is low, but capacity is insufficient to meet growing demand for high capacity IP/Ethernet connections
Solution Approach 1:
The ODU is divided into multiple transmitter modules (first and second transmitter modules), each handling specific channels. This modular segmentation allows the system to scale capacity by adding more modules while maintaining manageable complexity through standardized interface designs and independent module operation.
Solution Approach 2:
The patent implements a universal ODU architecture where multiple transmitter modules can handle different channel configurations (e.g., first and second channels on one coaxial interconnect, third and fourth channels on another). This multi-functionality allows the same hardware platform to adapt to various capacity requirements without redesigning the entire system.
3Productivity
If single channel coaxial interconnect is used, then implementation cost is reduced, but the system cannot meet the shift from voice services to data services requiring high capacity connections
Solution Approach 1:
The patent combines multiple channels onto single coaxial interconnects using the same physical infrastructure. By merging channel transmission paths and sharing common components (power amplifiers, signal processing units), the system achieves quadruple capacity without proportionally increasing capital expenditure on cables and basic hardware.
4Reliability
If conventional microwave backhaul architecture is used, then system reliability is acceptable under normal conditions, but reliability deteriorates in adverse weather conditions
Solution Approach 1:
The patent implements adaptive coding and modulation that uses feedback mechanisms to monitor channel conditions and adjust transmission parameters accordingly. In adverse weather conditions, the system can detect signal degradation and dynamically adapt modulation schemes or coding rates to maintain reliable communication, thereby improving robustness against environmental factors.
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 enhances capacity without significant capital expenditure, supports higher bandwidth demands, and improves reliability by enabling efficient transmission and reception of multiple channels, addressing the limitations of conventional systems.
Implementation Method 1
a first transmitter module that is configured to receive first analog baseband signals from the first dual channel processing module, the first analog baseband signals including the first channel and the second channel
Implementation Method 2
a first modem that is configured to modulate a first radio frequency signal carried over a first microwave channel to a first modulated radio frequency signal
Implementation Method 3
a first receiver module that is configured to receive fourth modulated radio frequency signals from a fourth channel, the fourth modulated radio frequency signals including the third channel and the fourth channel
Data Source
AI summary
A microwave backhaul system having quadruple capacity. In one embodiment, an outdoor communication unit in a microwave backhaul system is provided, which includes a first and second dual channel processing modules that are each configured to process two transmission/reception channels. The outdoor communication unit also includes two transmitter modules that are each configured to upconvert two channels for transmission at vertical polarization and a horizontal polarization.