Coherent Receiver DSP for Main and AMCC Signal Separation
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Solution Overview
Problem
The application of an auxiliary management and control channel (AMCC) scheme to a continuous phase frequency shift keying (CPFSK) scheme in digital coherent transmission schemes complicates the device configuration of the receiver due to the separation of main and AMCC signals at the optical stage.
Innovation Solution
A receiving apparatus and method that includes a reception unit to convert signal light into an analog electric signal, and a processing unit to acquire and determine a code sequence based on a frequency offset amount, using a frequency offset amount acquisition unit and a determination unit to simplify the configuration by performing DSP processing on the electric signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the main signal and the AMCC signal are separated at the optical stage, then the signals can be independently processed, but the device configuration of the receiver becomes complicated
Solution Approach 1:
The patent merges the main signal and AMCC signal processing into a unified receiver configuration. Instead of separating the signals optically and requiring independent processing paths, the invention combines both signal types into a single reception path that processes the composite signal together, thereby simplifying the receiver device configuration while maintaining the ability to independently extract and process each signal type through digital signal processing techniques.
2Adaptability or versatility
If an AMCC scheme is applied to the CPFSK scheme, then auxiliary control functions are enhanced, but the receiver configuration becomes more complex due to signal separation requirements
Solution Approach 1:
The patent implements a universal receiver structure that can handle both main signal and AMCC signal processing through a single integrated path. The receiver is designed to perform multiple functions - receiving the composite CPFSK signal with embedded AMCC information, extracting the frequency offset, and simultaneously recovering both the main data signal and the auxiliary control signal, thereby achieving multi-functionality without increasing structural complexity.
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 simplifies the configuration of the receiving apparatus by improving noise characteristics and eliminating the need for additional devices, thereby enhancing the separation of main and AMCC signals.
Implementation Method 1
a reception unit (hereinafter also referred to as 'receiver') that receives signal light frequency-modulated by a signal obtained by adding a main signal and a control signal having a lower frequency than the main signal, and converts the signal light into an analog electric signal
Data Source
AI summary
One aspect of the present invention is a receiving apparatus including a reception unit that receives signal light frequency-modulated by a signal obtained by adding a main signal and a control signal having a lower frequency than the main signal, and converts the signal light into an analog electric signal, and a processing unit that acquires a code sequence corresponding to the control signal on the basis of the analog electric signal, in which the processing unit includes a frequency offset amount acquisition unit that acquires a frequency offset amount of the signal light acquired on the basis of the analog electric signal, and a determination unit that determines the code sequence corresponding to the control signal on the basis of the frequency offset amount acquired by the frequency offset amount acquisition unit.