OFDM Cyclic Suffix Configuration for Full-Duplex Interference
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Solution Overview
Problem
Existing full-duplex communication systems face challenges in estimating and suppressing self-interference (SI) and cross-link interference (CLI) signals, leading to inter-symbol interference (ISI), which limits system throughput.
Innovation Solution
Implementing a method and apparatus that dynamically adjust the OFDM cyclic suffix length based on interference power and timing advance to mitigate intra-network interference, using configuration information to add cyclic suffixes to OFDM symbols, thereby enhancing interference estimation and suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If co-frequency co-time full-duplex technology is used to double spectral efficiency, then spectral efficiency is improved, but self-interference and cross-link interference cause inter-symbol interference
Solution Approach 1:
The patent applies preliminary action by adding a cyclic suffix to OFDM symbols before transmission. This cyclic suffix is configured based on estimated interference characteristics (self-interference and cross-link interference) to preemptively protect against inter-symbol interference. The cyclic suffix length is determined in advance using configuration information that accounts for the full-duplex interference environment, thereby preventing ISI before it occurs during reception.
2Ease of operation
If a fixed OFDM cyclic suffix length is used, then implementation is simple, but it cannot adapt to varying interference conditions in full-duplex communication
Solution Approach 1:
The patent implements dynamics by making the OFDM cyclic suffix length configurable and adaptable to varying interference conditions. The cyclic suffix length is determined based on configuration information that reflects the current full-duplex interference environment, including self-interference and cross-link interference characteristics. This allows the system to dynamically adjust the cyclic suffix length to match changing interference conditions while maintaining reasonable implementation complexity through standardized configuration mechanisms.
3Reliability
If the cyclic suffix length is increased to suppress interference, then interference suppression effect is improved, but system throughput decreases due to longer symbol duration
Solution Approach 1:
The patent applies parameter changes by optimizing the cyclic suffix length based on configuration information that accounts for interference characteristics. Rather than using a fixed or uniformly large cyclic suffix, the system adjusts the cyclic suffix length parameter to match the actual interference conditions (self-interference and cross-link interference levels). This ensures sufficient interference suppression while minimizing the overhead impact on system throughput by using the minimum necessary cyclic suffix length for the given interference environment.
Data Source
AI summary
The present disclosure relates to signal sending methods and apparatuses. In one example method, after obtaining, at a first moment, first configuration information that includes information about a first orthogonal frequency division multiplexing (OFDM) cyclic suffix length, a terminal obtains the first OFDM cyclic suffix length from the first configuration information, and communicates with a network device at a second moment after the first moment by using the first OFDM cyclic suffix length.