Low Voltage Broadband Power Line Carrier Communication Preamble Segmentation
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Solution Overview
Problem
The existing low voltage broadband power line carrier communication systems face significant resource and time overheads due to the large bandwidth and processing requirements for long preambles used in frequency offset compensation, automatic gain control, symbol synchronization, and channel estimation.
Innovation Solution
The method involves transmitting a physical layer protocol frame that includes both short and long preambles, with short preambles performing initial automatic gain control, channel estimation, and coarse-grained frequency offset compensation, followed by long preambles for fine-grained processing, reducing resource and time overheads while maintaining precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If long preambles are used for frequency offset compensation, automatic gain control, symbol synchronization and channel estimation, then receiver performance is improved, but resource overhead and time overhead increase
Solution Approach 1:
The preamble is segmented into two types: short preamble and long preamble. The short preamble is used for initial quick processing (coarse-grained frequency offset compensation, automatic gain control, symbol synchronization), while the long preamble is used for refined processing (fine-grained frequency offset compensation, channel estimation). This segmentation allows the system to achieve both quick convergence and high precision without requiring all processing to use the full long preamble, thereby reducing time overhead.
2Measurement precision
If long preambles are used for frequency offset compensation and channel estimation, then measurement precision is improved, but resource overhead increases
Solution Approach 1:
The processing tasks are segmented and distributed between short and long preambles. Coarse-grained frequency offset compensation and automatic gain control are performed using the short preamble, which reduces the processing burden. The long preamble is then used only for fine-grained frequency offset compensation and channel estimation, which are the tasks requiring high measurement precision. This segmentation allows the system to achieve high precision where needed while reducing overall resource overhead.
Solution Approach 2:
Instead of using the full long preamble for all processing tasks (which would be excessive action), the system uses the short preamble for initial processing tasks that don't require full precision, and only applies the long preamble for tasks that do require high precision. This partial action approach optimizes resource utilization by avoiding unnecessary processing overhead for tasks where the short preamble suffices.
3Device complexity
If only short preambles are used, then resource overhead is reduced, but frequency offset compensation and symbol synchronization accuracy deteriorate
Solution Approach 1:
The system segments the preamble into short and long versions with different functional assignments. The short preamble provides sufficient accuracy for coarse-grained frequency offset compensation and automatic gain control, while the long preamble provides the additional precision needed for fine-grained frequency offset compensation and channel estimation. This segmentation allows the system to achieve both low resource overhead (by using short preambles for most tasks) and high measurement precision (by using long preambles for critical tasks).
Data Source
AI summary
Disclosed is a method for low voltage broadband power line carrier communication; when transmitting a physical layer protocol frame, short preambles are first transmitted to undergo automatic gain control, channel estimation, coarse-grained frequency offset compensation, and symbol synchronization; and then long preambles are transmitted to undergo automatic gain control, channel estimation, fine-grained frequency offset compensation, and symbol synchronization. Compared with the scheme of only transmitting long preambles, the present disclosure combines transmissions of short preambles and long preambles, which thus may quickly and accurately implement frequency offset compensation, automatic gain control, symbol synchronization, and channel estimation without sacrifice of precision, thereby achieving quick convergence, reducing resource overheads and time overheads, and enhancing system performance.