Expansion-Factor Signaling for Low-PAPR Spectrum-Efficient Transmission
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Solution Overview
Problem
Existing communication systems face challenges in achieving low peak to average power ratio (PAPR) while maintaining transmission efficiency, as conventional methods like DFT-s-OFDM-FDSS expand bandwidth at the cost of spectrum utilization.
Innovation Solution
A communication method that utilizes an expansion factor to increase the quantity of information bits transmitted through a filter without increasing bandwidth, by incorporating an expansion factor in the spectrum replication process, which is indicated via signaling such as RRC, MAC CE, or DCI, and is calculated based on parameters like roll-off factor, bandwidth, and modulation and coding scheme.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DFT-s-OFDM-FDSS is used to achieve low PAPR through spectral shaping, then the peak to average power ratio is reduced, but the bandwidth is expanded at the expense of transmission efficiency
Solution Approach 1:
The patent changes the expansion factor parameter from a fixed value to a dynamically adjustable parameter. By indicating different expansion factor values through signaling (RRC, MAC CE, or DCI), the system can adapt the spectral expansion degree to different transmission scenarios, thereby balancing PAPR reduction and transmission efficiency based on channel conditions and service requirements
2Productivity
If the quantity of information bits is increased through spectrum replication, then spectrum utilization is improved, but the bandwidth would need to be expanded
Solution Approach 1:
The patent introduces the expansion factor as an additional dimension for controlling spectral replication. Instead of simply increasing bandwidth to transmit more bits, the system uses the expansion factor to control the degree of spectral replication in the frequency domain, allowing more information bits to be transmitted within the same bandwidth by efficiently utilizing the spectral dimension
Data Source
AI summary
Embodiments of this application provide a communication method and apparatus. In the method, the first communication apparatus may receive a first message, where the first message includes information about an expansion factor. The first communication apparatus determines a quantity of information bits based on the expansion factor, generates a to-be-sent signal based on the quantity of information bits; and transmits the to-be-sent signal. During communication, the communication apparatus uses the expansion factor in transmission, so that the quantity of information bits transmitted in a filter can be increased, to ensure high spectrum utilization and high data transmission efficiency.