Time-Frequency Slicing Signal Frame PLP Arrangement
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Solution Overview
Problem
Digital broadcasting technologies face challenges in improving data transmission efficiency and error correction capabilities, particularly with the increasing demand for high-definition services and multiple broadcasting channels, where existing methods struggle to efficiently transmit and receive signals with high reliability.
Innovation Solution
A method and apparatus that convert service streams into physical layer pipes, arrange them in time-frequency slicing signal frames, insert layer-1 information into the preamble, modulate using orthogonal frequency division multiplexing (OFDM), and transmit via radio frequency bands, enabling efficient error correction and channel identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If service streams are transmitted directly without conversion to physical layer pipes, then the transmission process is simpler, but data transmission efficiency and error correction capability are reduced
Solution Approach 1:
The service stream is segmented into multiple physical layer pipes (PLPs), allowing parallel transmission and improving efficiency. Each PLP can be independently processed, arranged in time-frequency slicing frames, and transmitted via OFDM, enabling flexible resource allocation and enhanced error correction through diverse transmission paths
Solution Approach 2:
Physical layer pipes serve as intermediary structures between the service stream and the physical transmission medium. These PLPs enable systematic error correction coding, time-frequency slicing arrangement, and OFDM modulation, resolving the contradiction by introducing structured intermediate layers that improve efficiency without requiring complete process redesign
2Reliability
If error correction coding is applied to service streams, then error correction capability is improved, but data transmission efficiency decreases due to added redundancy
Solution Approach 1:
Error correction capability is enhanced by changing the parameter of code rate and applying different coding schemes to different PLPs. The system can adjust coding strength dynamically, applying stronger correction where needed and lighter coding where bandwidth is critical, thus balancing reliability and transmission efficiency through parameter optimization
3Adaptability or versatility
If multiple broadcasting channels are transmitted simultaneously, then service diversity is increased, but signal interference and reception reliability are worsened
Solution Approach 1:
Multiple broadcasting channels are transmitted by utilizing different time-frequency dimensions through time-frequency slicing. PLPs are arranged in different signal frames and frequency bands, spreading transmissions across multiple dimensions to reduce interference. OFDM modulation further divides the spectrum into orthogonal subcarriers, allowing simultaneous channel transmission with minimal interference while maintaining reception reliability
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 enhances data transmission efficiency, reduces error detection probabilities, and allows for seamless channel identification and service recovery, even in delay spread channels and interference conditions, thereby improving overall signal reception and transmission performance.
Implementation Method 1
modulating the TFS signal frame by an orthogonal frequency division multiplexing (OFDM) scheme and outputting a modulated signal
Data Source
AI summary
A method of transmitting and receiving a signal and an apparatus for transmitting and receiving a signal are provided. The method includes receiving the signal of a first frequency band, obtaining Layer-1 (L1) information from a preamble of a first time-frequency slicing (TFS) signal frame of the received signal, the layer-1 information including a radio frequency (RF) channel identifier of the first TFS signal frame including a physical layer pipe (PLP) in a super frame of TFS structure and including an identifier of a starting radio RF channel that can receive the PLP in the first TFS signal frame, parsing the first TFS signal frame using the L1 information and obtaining a PLP of the first TFS signal frame, and converting the PLP to a service stream.