Adaptive Reference Signal Base Sequence for π/2 BPSK
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Solution Overview
Problem
Current wireless communication systems, particularly in 4G LTE, face challenges in adapting to new modulation schemes like π/2 BPSK, leading to suboptimal channel estimation and communication performance due to fixed reference signal sequence configurations that do not account for modulation scheme changes.
Innovation Solution
The method involves determining specific base sequence configurations for reference signals based on the modulation scheme of uplink data transmission, allowing for adaptive generation of dedicated demodulation reference signals, particularly for π/2 BPSK and other schemes, to improve channel estimation and communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed reference signal sequence configurations are used, then device complexity is reduced, but channel estimation precision deteriorates when new modulation schemes like π/2 BPSK are introduced
Solution Approach 1:
The patent applies dynamics by making the reference signal sequence configuration adaptive to the modulation scheme. Instead of using a fixed configuration, the system dynamically selects or generates reference signal sequences based on the detected modulation scheme (e.g., π/2 BPSK, QPSK, 16QAM), allowing the reference signal properties to change according to the data modulation requirements.
Solution Approach 2:
The patent changes key parameters of the reference signal sequence (such as sequence length, root index, or generation polynomial) based on the modulation scheme being used. For example, different root indices or sequence lengths are selected for π/2 BPSK compared to QPSK or 16QAM, optimizing channel estimation for each modulation type while maintaining manageable system complexity through standardized parameter sets.
2Measurement precision
If adaptive reference signal configurations are implemented for different modulation schemes, then channel estimation precision is improved, but device complexity increases
Solution Approach 1:
The patent manages complexity by defining specific parameter sets for different modulation schemes. Rather than allowing arbitrary configurations, the system uses predetermined parameter combinations (e.g., specific root indices, sequence lengths) that are optimized for each modulation type, making the adaptive process systematic and manageable.
Solution Approach 2:
The patent creates a universal reference signal generation framework that can handle multiple modulation schemes through a unified procedure. The same basic reference signal generation mechanism is used across different modulation types, with only specific parameters changing, allowing one system to serve multiple functions without requiring separate specialized mechanisms for each modulation scheme.
3Reliability
If reference signals are optimized for specific modulation schemes, then communication performance is improved, but adaptability to new modulation schemes deteriorates
Solution Approach 1:
The patent ensures the system remains dynamic and adaptable by implementing a detection mechanism that identifies the modulation scheme being used and automatically adjusts the reference signal configuration accordingly. This allows the system to maintain optimized performance for known schemes while being ready to adapt to new modulation types as they are detected.
Solution Approach 2:
The patent segments the reference signal configuration space into distinct parameter sets corresponding to different modulation schemes. This segmentation allows each scheme to have its own optimized parameters while maintaining an organized structure that facilitates adding new schemes without overwhelming complexity.
Data Source
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AI summary
This application discloses a wireless communication method, a wireless communications apparatus, and a wireless communications system. The wireless communication method includes: receiving, by a terminal, indication information of uplink data transmission from a base station, where the indication information is used to indicate a modulation scheme of the uplink data transmission; determining, by the terminal, a base sequence configuration of a reference signal sequence corresponding to the modulation scheme of the uplink data transmission, and generating a dedicated demodulation reference signal based on the determined base sequence configuration of the reference signal sequence, where the modulation scheme of the uplink data transmission is one of a plurality of modulation schemes supported by the terminal, the plurality of modulation schemes include at least π/2 binary phase shift keying BPSK, and a base sequence configuration of a reference signal sequence corresponding to the π/2 BPSK is different from a base sequence configuration of a reference signal sequence corresponding to another modulation scheme in the plurality of modulation schemes.