FDSS Spectrum Extension With Tone Reservation for PAPR Reduction
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Solution Overview
Problem
Existing communication technologies lack integration of frequency domain spectral shaping (FDSS) with spectrum extension and tone reservation, leading to suboptimal MPR/PAPR reduction and inefficient utilization of radio resources.
Innovation Solution
A communication apparatus and method that determines frequency components for spectrum-extension and non-spectrum-extension parts of a signal, generates a compensating signal, and transmits a reduced peak signal using FDSS with spectrum extension and tone reservation, optimizing resource allocation and reducing MPR/PAPR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If FDSS is applied without spectrum extension, then MPR/PAPR is reduced, but spectral efficiency is limited
Solution Approach 1:
The signal spectrum is segmented into multiple parts: the original signal spectrum, spectrum extension parts (copied and shifted versions of the original spectrum), and tone reservation parts. This segmentation allows independent optimization of each part - the original part maintains data transmission while the extension parts provide MPR/PAPR reduction and reserved tones enable peak clipping, thereby resolving the contradiction between MPR/PAPR reduction and spectral efficiency
Solution Approach 2:
The patent implements a nested structure where spectrum extension parts are created by copying and shifting the original signal spectrum, and tone reservation is nested within the extended spectrum. The compensating signal generated from reserved tones is then nested with the original and extended signals to produce the final transmitted signal. This nested architecture enables multiple functions (data transmission, MPR reduction, peak control) to coexist efficiently
2Object-generated harmful factors
If spectrum extension is added to FDSS, then MPR/PAPR reduction is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary actions by pre-copying the original signal spectrum to create spectrum extension parts before modulation and transmission. The compensating signal is also generated in advance based on reserved tones. These preliminary preparations simplify the overall processing by organizing the signal structure beforehand, reducing the complexity of real-time processing while achieving improved MPR/PAPR reduction
Solution Approach 2:
The patent changes key signal parameters including spectrum allocation (dividing into original, extension, and reserved parts), frequency shifting (copying and shifting spectrum to create extension parts), and amplitude control (using compensating signals to adjust peak levels). These parameter changes enable systematic control of MPR/PAPR while maintaining manageable processing complexity through structured transformations
3Object-generated harmful factors
If tone reservation is integrated with FDSS, then peak-to-average power ratio is reduced, but radio resource utilization decreases
Solution Approach 1:
The patent applies local quality by reserving specific tones (local frequency resources) for compensating signal generation while maintaining data transmission in other frequency regions. The spectrum extension parts are selectively created in specific frequency bands, and tone reservation is applied locally rather than globally. This localized approach ensures that peak reduction is achieved where needed while minimizing the impact on overall radio resource utilization
Solution Approach 2:
The patent introduces spectrum extension parts as an intermediary between the original signal and the final transmitted signal. These extension parts serve as a bridge that allows tone reservation to be implemented without directly consuming data transmission resources. The compensating signal generated from reserved tones acts as another intermediary that modifies the combined signal to reduce peaks, thereby achieving peak reduction while preserving radio resource efficiency for data transmission
Data Source
AI summary
The present disclosure provides communication apparatuses and communication methods for integrating frequency domain spectral shaping (FDSS) with spectrum extension and tone reservation. The communication apparatuses include a communication apparatus comprising: circuitry, which in operation: determines one or more frequency components for a spectrum-10 extension (SE) part and one or more other frequency components for a non-SE part of a signal based on control information relating to the SE part and the non-SE part; generates a compensating signal based on the one or more frequency components of the SE part; and generates a reduced peak signal based on the compensating signal; and a transmitter, which in operation, transmits the 15 reduced peak signal.