Layered Division Multiplexing Pilot Signal Overhead Reduction
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Solution Overview
Problem
Current terrestrial digital television broadcasting systems, such as ISDB-T, DVB-T, and ATSC 3.0, face inefficiencies in data transmission due to the need for pilot signals, which do not carry data and thus reduce overall transmission efficiency.
Innovation Solution
The implementation of layered division multiplexing (LDM) in both reception and transmission apparatuses, where the pilot signal is included in a core layer and transmission data is included in an enhanced layer, allowing for efficient data transmission by optimizing the use of transmission power and minimizing the influence of noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pilot signals are transmitted for channel estimation, then channel estimation accuracy is improved, but transmission efficiency deteriorates
Solution Approach 1:
The patent merges the pilot signal transmission with data transmission by superimposing the pilot signal onto the data signal in the frequency domain. This allows both channel estimation and data transmission to occur simultaneously using the same time-frequency resources, eliminating the need for separate pilot-only transmission periods and thereby improving transmission efficiency while maintaining channel estimation accuracy.
2Reliability
If pilot signals are transmitted for channel estimation, then reception reliability is improved, but data transmission capacity deteriorates
Solution Approach 1:
The patent combines pilot signal transmission with data transmission by superimposing them in the frequency domain. This merging approach allows the system to maintain reception reliability through accurate channel estimation while simultaneously transmitting data, thereby maximizing data transmission capacity without sacrificing reception reliability.
Solution Approach 2:
The transmitted signal serves multiple functions simultaneously: it acts as both a data-carrying signal and a pilot signal for channel estimation. By making the transmission signal multi-functional, the system achieves both reliable reception and high data capacity without requiring separate dedicated pilot transmission resources.
Data Source
AI summary
The present technology relates to a reception apparatus, a reception method, a transmission apparatus, and a transmission method that enable efficient data transmission. When a reception apparatus including a processing unit that, when a transmission signal including transmission data is received, processes the transmission signal including a pilot signal on which layered division multiplexing (LDM) has been performed, and demodulates a part of the transmission data included in a second layer which is different from a first layer including the pilot signal, it is possible to efficiently perform data transmission using the pilot signal. The present technology can be applied to, for example, a broadcasting system compatible with a broadcasting method such as ISDB-T, ATSC, and the like.