Cyclic-Shift Filtering for Overlapping Terminal Interference
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Solution Overview
Problem
High peak to average power ratio (PAPR) in radio signals leads to signal distortion and inefficiencies in power amplification, particularly in high-frequency communication systems, necessitating effective signal filtering methods.
Innovation Solution
Implementing cyclic shift on filter coefficients and data with coefficients, along with configuring filter types and precoding, to reduce interference and PAPR, using DFT-s-OFDM and SC-OQAM technologies to separate real and imaginary parts of signals and apply frequency domain filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal filtering is performed to reduce peak to average power ratio, then signal distortion is reduced, but device complexity increases
Solution Approach 1:
The patent applies cyclic shift to filter coefficients and data with coefficients, changing the temporal parameters of the signal processing. This transforms the filtering approach from static to dynamic, reducing PAPR through parameter modification rather than complex filtering structures. The cyclic shift operation modifies the time-domain characteristics of the filtered signal, achieving distortion reduction with simpler implementation.
Solution Approach 2:
The patent introduces dynamic elements by applying cyclic shift operations that vary the filter coefficients and data positioning in time. This dynamic approach allows the system to adaptively reduce PAPR without requiring complex static filtering structures, resolving the contradiction between signal quality and device complexity.
2Object-generated harmful factors
If cyclic shift is performed on filter coefficient and data, then interference between terminals is reduced, but computational complexity increases
Solution Approach 1:
The patent modifies the temporal parameters of filter coefficients and data by applying cyclic shift operations. This parameter transformation reduces interference between terminals occupying overlapping frequency resources by desynchronizing their signals in time, while maintaining computational efficiency through simple shift operations rather than complex processing.
Solution Approach 2:
The cyclic shift operation implements a periodic transformation on the filter coefficients and data, creating time-varying signal characteristics that reduce terminal interference. This periodic action achieves interference reduction through regular, predictable transformations that are computationally efficient to implement.
3Object-generated harmful factors
If M subcarriers are reserved for zero value signal transmission, then edge signal interference is reduced, but frequency resource utilization decreases
Solution Approach 1:
The patent extracts or removes M subcarriers from the active frequency resources, dedicating them to zero value signal transmission. This extraction creates protective guard bands at the frequency edges, isolating edge signals from interference while maintaining efficient utilization of the remaining frequency resources for data transmission.
Data Source
AI summary
A communication method and apparatus are provided. The method includes: receiving configuration information, where the configuration information includes one or both of the following indication information: whether cyclic shift is performed on a filter coefficient of a first communication apparatus, or whether cyclic shift is performed on data with the filter coefficient; and determining, based on the indication information, whether cyclic shift is performed on one or both of the filter coefficient of the first communication apparatus or the data with the filter coefficient. According to the method in embodiments of this application, in a scenario in which two terminals occupy completely overlapping or partially overlapping frequency domain resources, an access network device may configure cyclic shift of corresponding filter coefficients for different terminals, so that interference between the two terminals is reduced.