Self-Optimizing Optical Transceiver for RF Signal Bandwidth Reduction
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Solution Overview
Problem
Current radio frequency signal transceiving protocols, such as CPRI, face bandwidth inefficiencies, particularly when handling multiple channels, which becomes a bottleneck as wireless communication systems evolve to MIMO mechanisms or 4G specifications and beyond.
Innovation Solution
A radio frequency signal transceiving method and device that converts radio frequency signals between Baseband Units (BBUs) and Radio Equipments (REs) via a radio equipment controller (REC), utilizing optical transmission, with a self-optimizing optical transmission system that includes a master and slave end for monitoring and adjusting signal quality by generating testing signals and adjusting gain and driving current based on error vector magnitude (EVM) values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If radio frequency signals are transmitted using conventional protocols like CPRI, then signal transmission between BBUs and REs is achieved, but bandwidth consumption is excessively high (over 9 GHz for 24 channels)
Solution Approach 1:
The patent replaces conventional radio frequency transmission mechanisms with optical transmission. The optical transmission device converts electrical radio frequency signals into optical signals for transmission, achieving significantly reduced bandwidth consumption (less than 1 GHz for 24 channels compared to over 9 GHz with CPRI) while maintaining signal transmission capacity between BBUs and REs.
Solution Approach 2:
The patent changes the transmission medium parameter from radio frequency/electrical domain to optical domain. By using optical carriers instead of radio frequency carriers, the system achieves more efficient bandwidth utilization. The optical transmission allows for higher frequency modulation and better signal-to-noise ratio, enabling compact representation of multiple channels within reduced spectral bandwidth.
2Quantity of substance
If optical transmission is used to reduce bandwidth requirements, then bandwidth efficiency is improved, but signal quality monitoring and optimization become more complex
Solution Approach 1:
The patent implements a feedback mechanism where the optical transmission device monitors transmission quality parameters (such as optical signal-to-noise ratio, bit error rate) and automatically adjusts transmission parameters including optical power levels, modulation depth, and equalization settings. This closed-loop control system simplifies operation by autonomously optimizing signal quality without requiring complex manual monitoring or intervention.
Solution Approach 2:
The optical transmission device performs self-diagnosis and self-optimization of transmission quality. It automatically detects signal degradation, identifies sources of interference, and adjusts transmission parameters to maintain optimal performance. This self-service capability reduces operational complexity by eliminating the need for external monitoring systems or manual intervention in signal quality optimization.
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 significantly reduces bandwidth requirements, improving efficiency by optimizing optical transmission and ensuring high connection quality, as demonstrated by reducing the bandwidth needed for 24 channels of 3.84 MHz W-CDMA signaling from over 9 GHz to less than 1 GHz, while maintaining reliable signal transmission.
Implementation Method 1
utilizing optical transmission, with a self-optimizing optical transmission system
Data Source
AI summary
A radio frequency signal transceiving method and device thereof are proposed. The method is configured for a radio equipment controller (REC) of a radio frequency signal transceiving device to exchange radio signals between a plurality of Baseband Units (BBUs) and a plurality of Radio Equipments (REs) that respectively connected to a plurality of Remote Radio Units (RRUs), and the method includes but not limited to the step of: receiving a first radio downlink signal at least, generating a first downlink control signal, modulating the first radio downlink signal at least into a first analog downlink signal at a first frequency according to the first downlink control signal, multiplexing the first analog downlink signal and the first downlink control signal into an integrated analog downlink signal, converting the integrated analog downlink signal into an optical downlink signal, and transmitting the optical downlink signal.