Dynamic Reference Signal Sequences for Multipath Delay
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Solution Overview
Problem
Current wireless communication technologies face challenges in maintaining data transmission rates due to cyclic prefix (CP) and guard interval (GI) overhead, which increase energy consumption and reduce spectral efficiency, while struggling to effectively handle multipath delay and channel estimation accuracy.
Innovation Solution
The proposed solution involves generating a transmit waveform organized in subframes with data and reference portions, where the reference portion includes a part of a reference signal, and adjusting the lengths of these portions based on control information to adapt to changing wireless channel environments, thereby minimizing CP and GI overhead and maintaining low Peak Average Power Ratio (PAPR) and channel estimation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cyclic prefix (CP) and guard interval (GI) are used to handle multipath delay, then multipath delay problem is solved, but data transmission rate decreases due to overhead
Solution Approach 1:
The patent applies dynamics by making the reference signal sequence length adjustable based on channel conditions. The system dynamically configures the length of reference signal sequences (e.g., 2, 4, 6, or 8 symbols) according to the multipath delay characteristics, allowing the guard interval to adapt to varying channel environments rather than using a fixed CP/GI structure. This resolves the contradiction by optimizing the balance between multipath protection and data transmission efficiency in real-time.
Solution Approach 2:
The patent changes the parameter of reference signal sequence length to resolve the contradiction. By adjusting the length parameter of reference signals (configurable as 2, 4, 6, or 8 symbols), the system optimizes the trade-off between overhead and multipath delay handling capability. This parameter adjustment allows the system to maintain lower overhead while providing sufficient protection against multipath effects, thereby improving data transmission rate without sacrificing reliability.
2Measurement precision
If reference signal length is increased to improve channel estimation accuracy, then channel estimation accuracy improves, but spectral efficiency decreases
Solution Approach 1:
The system dynamically adjusts reference signal length based on channel conditions and estimation requirements. When channel estimation accuracy is critical (e.g., in high mobility or complex multipath environments), the system increases reference signal length. When spectral efficiency is the priority (e.g., in good channel conditions), the system reduces reference signal length. This dynamic adaptation resolves the contradiction by optimizing the balance between estimation accuracy and spectral efficiency according to actual operating conditions.
Solution Approach 2:
The patent employs parameter changes by configuring the reference signal sequence length (2, 4, 6, or 8 symbols) based on channel estimation requirements and spectral efficiency considerations. This parameter adjustment mechanism allows the system to flexibly trade off between channel estimation accuracy and spectral efficiency, resolving the contradiction by selecting the optimal reference signal length for each specific operating scenario.
3Device complexity
If fixed length CP and GI are used, then implementation is simple, but adaptability to changing wireless channel environments is poor
Solution Approach 1:
The patent implements dynamics by enabling flexible configuration of reference signal sequence lengths (2, 4, 6, or 8 symbols) based on channel conditions. This allows the system to adapt to changing wireless environments (different multipath delay characteristics, mobility conditions, etc.) while maintaining a relatively simple implementation framework. The base station configures appropriate reference signal lengths through signaling, and both base station and terminal follow the configured structure, achieving adaptability without excessive complexity.
Data Source
AI summary
This patent document discloses techniques that can be implemented in various embodiments to prevent the data transmission rate from decreasing due to the CP and GI while solving the multipath delay problem and maintaining low PAPR and channel estimation accuracy. In some embodiments of the disclosed technology, a wireless communication method can be implemented to generate a transmit waveform that is organized in transmission subframes, wherein a given transmission subframe includes one or more data block each including a data portion and a reference portion, wherein the reference portion includes a part of a reference signal that is included in at least one of the transmission subframes.