Transceiver PHY Ethernet Link Eliminates Coaxial Filters
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Solution Overview
Problem
In microwave radio systems, the coupling of indoor units (IDU) and outdoor units (ODU) over coaxial cables leads to complex filter requirements and self-interference due to triple transit influences, degrading performance.
Innovation Solution
The use of PHY Ethernet communication over Ethernet cables, which eliminates the need for complex filters and reduces self-interference by employing adaptive cancellation and I/Q module transformations to convert complex signals into bit words and framewords for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coaxial cable coupling is used between IDU and ODU, then signal transmission is achieved, but complex filters are required and self-interference occurs due to triple transit influences
Solution Approach 1:
The patent extracts and removes the complex filtering requirements from the system by transitioning from coaxial cable coupling to Ethernet cable coupling with digital signal processing. The I/Q modules and PHY devices process signals in the digital domain, eliminating the need for complex analog filters that were required in the coaxial cable system to handle frequency separation and triple transit influences.
Solution Approach 2:
The patent replaces the mechanical/analog coaxial cable coupling system with a digital Ethernet cable coupling system. Instead of using analog frequency division and physical filtering, the system uses digital bit word processing, framewords, and adaptive cancellation algorithms to achieve signal separation and interference reduction, substituting mechanical filtering with digital signal processing.
2Reliability
If coaxial cable coupling is used between IDU and ODU, then signal transmission is achieved, but self-interference degrades performance due to triple transit influences
Solution Approach 1:
The patent converts the harmful triple transit self-interference into a manageable digital signal processing problem. By using adaptive cancellation in the PHY devices and digital processing in the I/Q modules, the system takes the reflected and re-transmitted signals that cause interference and actively cancels them through digital algorithms, turning a physical layer problem into a solvable digital processing task.
Solution Approach 2:
The patent introduces digital intermediaries (I/Q modules and PHY devices) that process signals in the digital domain between the analog wireless interface and the digital baseband. These intermediary digital processing stages allow for precise control and cancellation of self-interference through adaptive algorithms, acting as a buffer that eliminates the direct harmful interaction present in analog coaxial cable systems.
3Reliability
If complex filters are used in IDU and ODU, then signal separation is achieved, but circuit complexity and cost increase
Solution Approach 1:
The patent replaces complex analog filter circuits with digital signal processing implemented in I/Q modules and PHY devices. Instead of using multiple analog filters with different frequency characteristics to separate signals, the system uses digital processing of bit words and framewords to achieve signal separation, dramatically reducing circuit complexity while maintaining or improving separation capability.
4Reliability
If complex filters and coaxial cables are used, then signal transmission is achieved, but system cost increases
Solution Approach 1:
The patent replaces expensive, precision-matched coaxial cables and complex filters with standard Ethernet cables and digital processing components. Ethernet cables are a commodity product with standardized specifications, eliminating the need for expensive custom cable matching and precision filter manufacturing, thereby significantly reducing system cost while maintaining transmission reliability through digital error handling and adaptive processing.
Data Source
AI summary
Systems and methods for transceiver communication are discussed herein. An exemplary system comprises a first transceiver and a second transceiver. The first transceiver may comprise an I/Q module and a PHY device. The I/Q module may receive a first complex signal and transform the first complex signal into bit words of a predetermined size and framewords. The PHY device may receive the bit words, transmit the bit words and framewords over a cable, and perform adaptive cancellation. The second transceiver may comprise a PHY device, an I/Q module, an I/Q modulator, and an antenna. The PHY device may receive the bit words and the framewords from over the cable. The I/Q module may transform the bit words to a second complex signal based on the framewords. The I/Q modulator may modulate the complex signal to generate a transmit signal. The antenna may transmit the signal.