Multi-Carrier Receiver Combining for Channel Time Synchronization
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Solution Overview
Problem
Existing multiple carrier transmission systems face challenges in efficiently handling time differences between channels and converting variable-length packets into fixed-length transmission packets, leading to difficulties in reliable data absorption and synchronization.
Innovation Solution
The proposed solution involves a receiving system with a combiner add-on and sequential demodulator configuration that absorbs time differences and converts variable-length packets into fixed-length packets by using identification data and delay correction signals, ensuring reliable multiple carrier transmission and data synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple carrier transmission is implemented to increase transmission capacity, then data transmission efficiency is improved, but time synchronization between channels becomes difficult to maintain
Solution Approach 1:
The system performs preliminary actions by adding identification data to divided signals before transmission, and by pre-configuring the combiner with timing adjustment capabilities. This allows the receiving system to automatically synchronize channels based on the embedded identification data, resolving the time synchronization issue before it affects data reconstruction.
Solution Approach 2:
The combiner uses feedback mechanisms to detect timing differences between multiple carrier channels and dynamically adjusts the timing of each channel. By continuously monitoring and adjusting based on the identification data from each carrier, the system maintains synchronization while preserving the benefits of multiple carrier transmission.
2Adaptability or versatility
If variable-length packets are transmitted to improve data flexibility, then adaptability is improved, but conversion to fixed-length transmission packets becomes complex
Solution Approach 1:
The system segments the complex packet conversion process into distinct stages: identification data embedding in the transmitter, identification data detection in the receiver, and timing-adjusted combination. This segmentation simplifies each individual process while maintaining the ability to handle variable-length packets efficiently.
Solution Approach 2:
Identification data serve as an intermediary element between the variable-length source packets and the fixed-length transmission packets. These identification data markers enable the combiner to automatically determine how to allocate and combine variable-length packets into fixed-length transmission packets without complex conversion logic.
3Adaptability or versatility
If existing receiving systems are upgraded to support multiple carriers, then system adaptability is improved, but system complexity increases
Solution Approach 1:
The combiner is designed with multi-functionality to handle both single-carrier and multi-carrier reception. It can detect the presence of multiple carriers, automatically adjust timing for each carrier based on embedded identification data, and combine them appropriately. This universal design allows existing receiving systems to upgrade to multi-carrier support by simply adding the combiner without redesigning the entire system.
Data Source
AI summary
A receiving method for receiving a plurality of carriers and generating one or a plurality of streams. The method includes a first demodulating step of processing a first transmission signal and generating a first demodulation output; a second demodulating step of processing a second transmission signal different from the first transmission signal and generating a second demodulation output; a combining step of generating one stream based on the first demodulation output and the second demodulation output; a selecting step of selecting one among the first demodulation output and the one stream, and generating a selected stream; and a back-end processing step of generating an output for a display from the selected stream and the second demodulation output. In the selecting step, the first demodulation output is selected in a receiving mode in single channel transmission, and the one stream is selected in a receiving mode in multiple channel transmission.