Multicarrier Signal Overhead Repurposing for Interference Reduction
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Solution Overview
Problem
Radio communication systems face performance degradation due to time dispersion and inter-symbol interference (ISI) in wireless channels, especially in high-Doppler environments, which is exacerbated by the overhead introduced by guard periods and additional reference symbols.
Innovation Solution
The introduction of a new signal form where a second part of the multicarrier signal, initially considered as overhead, is used to carry useful information, allowing dynamic adjustment of tail duration based on channel characteristics, thereby reducing interference and maintaining robustness to delay spread.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guard periods and additional reference symbols are introduced to handle time dispersion and ISI, then channel robustness is improved, but system overhead increases
Solution Approach 1:
The patent converts the harmful overhead (guard periods and reference symbols that reduce system efficiency) into a beneficial resource by embedding useful information within these previously wasted resources. Specifically, the second part of the multicarrier signal, originally designated as overhead, is repurposed to carry additional data, thereby maintaining channel robustness while improving spectral efficiency and reducing the net overhead burden on the system.
2Productivity
If the second part of the multicarrier signal is used to carry useful information, then spectral efficiency is improved, but signal complexity increases
Solution Approach 1:
The patent segments the multicarrier signal into two distinct parts: the first part carries conventional data, while the second part (originally overhead) is allocated to carry additional useful information. This segmentation allows the system to utilize the full bandwidth more efficiently without requiring a complete redesign of the signal structure, thereby improving spectral efficiency while managing complexity through modular organization.
Solution Approach 2:
The second part of the multicarrier signal serves multiple functions: it maintains its original role in providing channel robustness and time dispersion handling, while simultaneously serving as a data-carrying channel. This multi-functionality increases spectral efficiency by ensuring that no part of the transmitted signal is wasted, while the complexity increase is mitigated by reusing existing signal processing infrastructure.
3Object-generated harmful factors
If tail duration is dynamically adjusted based on channel characteristics, then interference reduction is achieved, but processing complexity increases
Solution Approach 1:
The patent implements dynamic adjustment of the tail duration in the multicarrier signal based on real-time channel characteristics. Instead of using a fixed guard period, the system adapts the tail length to match the actual time dispersion of the channel, thereby minimizing inter-symbol interference while optimizing spectral efficiency. This dynamic approach reduces interference but requires additional processing to estimate and adjust tail duration based on channel conditions.
Solution Approach 2:
The system employs feedback mechanisms to monitor channel characteristics and adjust the tail duration accordingly. By continuously estimating channel impulse response and adapting the guard period length based on this feedback, the system achieves optimal interference reduction while maintaining robust performance across varying channel conditions, at the cost of increased processing complexity for real-time adaptation.
Data Source
AI summary
There is provided a method comprising: obtaining, by an apparatus, a first data block, a second data block and a third data block; generating a first signal, wherein a first part of the first signal is generated based on a data of the first data block, and wherein a second part of the first signal is generated based on a data of the second data block, the second part being subsequent in time domain compared with the first part; generating a second signal, wherein a first part of the second signal is generated based on a data of the third data block, and wherein a second part of the second signal is generated based on the data of the second data block, the second part being subsequent in time domain compared with the first part; and transmitting the first and second signals.