OFDM Frame Guard Interval Insertion for Extra Payload Distribution
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Solution Overview
Problem
Current broadcasting communication systems face challenges in efficiently utilizing extra payload regions, leading to suboptimal data processing efficiency and service performance, especially in high-quality digital television and multimedia services.
Innovation Solution
The proposed solution involves a transmitting apparatus and method that generates frames with orthogonal frequency-division multiplexing (OFDM) symbols, where guard intervals (GIs) and a cyclic postfix (CP) are strategically inserted to optimize the distribution of the extra payload region, improving data processing efficiency by utilizing the remaining region effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the extra payload region is not utilized, then the frame structure remains simple, but data processing efficiency is reduced
Solution Approach 1:
The extra payload region is divided into multiple segments and distributed across different OFDM symbols. Each segment is inserted into specific positions (front end of OFDM symbols, front end of GIs, or rear end of final OFDM symbol) based on the disposition reference, allowing efficient utilization of previously wasted space without creating a monolithic complex structure
Solution Approach 2:
The frame structure is made dynamic and adaptable through the disposition reference parameter, which can take different values to determine how the extra payload region is distributed. This allows the system to flexibly adjust the frame structure based on specific service requirements while maintaining a standardized base structure
2Productivity
If the extra payload region is distributed according to multiple disposition references, then data processing efficiency is improved, but service adaptability is reduced
Solution Approach 1:
The disposition reference mechanism is designed to be universal and multi-functional, supporting multiple distribution modes (first disposition reference for distributing to front end of OFDM symbols, second disposition reference for distributing to front end of GIs, third disposition reference for inserting in rear end of final OFDM symbol). This single mechanism can adapt to different service types and requirements, making the system versatile rather than limiting it
3Reliability
If guard intervals are inserted into all OFDM symbols, then signal reliability is improved, but data processing efficiency is reduced
Solution Approach 1:
Different parts of the frame receive different treatments regarding GI insertion. The extra payload region is selectively inserted into front ends of GIs in certain OFDM symbols, while other symbols maintain their standard structure. This localized optimization maintains signal reliability where needed while maximizing data efficiency in other regions
Solution Approach 2:
The guard intervals themselves are utilized to carry additional payload data, making the GI structure serve dual purposes: maintaining signal reliability through noise protection and increasing data throughput by carrying useful information in what would otherwise be redundant samples
Data Source
AI summary
A transmitting apparatus is provided. The transmitting apparatus includes: a frame generator configured to generate a frame including a plurality of orthogonal frequency-division multiplexing (OFDM) symbols; and a guard interval (GI) inserter configured to insert GIs into the generated frame, wherein the plurality of OFDM symbols are divided into a bootstrap, a preamble, and a payload, and the GI inserter inserts first GIs having a size corresponding to a fast Fourier transform (FFT) size of each of OFDM symbols configuring the payload into front ends of each of the OFDM symbols, inserts second GIs having a size corresponding to a quotient obtained by dividing an extra region of the payload calculated based on the FFT size of the OFDM symbols configuring the payload, the number of OFDM symbols, and the size of the first GIs by the number of OFDM symbols into front ends of each of the first GIs, and inserts a cyclic postfix (CP) having a size corresponding to the remainder remaining after dividing the extra region of the payload by the number of OFDM symbols into a rear end of a final OFDM symbol configuring the payload.