OFDM Pilot Signal Cyclic Prefix Suffix Frequency Shift
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Solution Overview
Problem
Digital broadcasting technologies face challenges in improving data transmission efficiency and error correction capabilities as the demand for high-definition video and audio signals increases, requiring more data and broadcasting channels.
Innovation Solution
A method and apparatus for transmitting and receiving signals using orthogonal frequency division multiplexing (OFDM) with a pilot signal structure that includes a cyclic prefix and suffix, frequency-shifted portions of the pilot signal, to enhance data transmission efficiency and error correction, particularly in multi-path channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional digital broadcasting is used, then basic video and audio transmission is achieved, but data transmission efficiency is insufficient for high-definition content
Solution Approach 1:
The patent changes the structure of the pilot signal by adding cyclic prefix and suffix, and applies frequency shifting to create a more robust pilot signal that improves channel estimation accuracy, thereby improving data transmission efficiency for high-definition content
2Adaptability or versatility
If more broadcasting channels are added to meet user demand, then service variety increases, but error correction capability becomes insufficient
Solution Approach 1:
The patent performs preliminary error correction by adding cyclic prefix and suffix to the pilot signal before transmission, which pre-establishes reference structures that enable more accurate channel estimation and subsequent error correction in multi-path environments
3Device complexity
If simple pilot signal structure is used, then transmission complexity is low, but preamble detection accuracy deteriorates in multi-path channels
Solution Approach 1:
The patent segments the pilot signal into distinct components by adding cyclic prefix and suffix portions, creating a structured signal that can be more easily detected and processed in multi-path channels, thereby improving preamble detection accuracy
Solution Approach 2:
The patent introduces asymmetry to the pilot signal structure by applying frequency shifting and creating unequal cyclic prefix and suffix portions, which enhances the signal's detectability and robustness against multi-path interference
Data Source
AI summary
A method for transmitting and receiving a signal and an apparatus for transmitting and receiving a signal are disclosed. The method for receiving the signal includes receiving (S210) the signal in a first frequency band, identifying (S220) a first pilot signal including, a cyclic prefix obtained by frequency-shifting a first portion of an useful portion of the first pilot signal and a cyclic suffix obtained by frequency-shifting a second portion of the useful portion of the first pilot signal from the received signal, demodulating (S220) a signal frame including a physical layer pipe (PLP) to which a service stream is converted, by an orthogonal frequency division multiplexing (OFDM) scheme, using information set in the first pilot signal, parsing (S230) the signal frame and obtaining the PLP and obtaining (S240) the service stream from the PLP.