Non-linear Precoding for Wireless Symbol Mapping
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Solution Overview
Problem
Existing wireless communication systems face limitations in handling non-linear data to redundant symbol mapping, particularly in managing larger delay spreads and peak-to-average-power ratio (PAPR) thresholds, which can lead to inter-symbol and inter-carrier interference.
Innovation Solution
The implementation of a non-linear precoding configuration for message transmission, where redundant and data symbols are precoded based on a selected configuration, and an indication of this configuration is transmitted to the receiving device, allowing for optimal mapping and decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If linear precoding configuration is used for message transmission, then the system maintains simplicity in implementation, but the system cannot effectively handle larger delay spreads and experiences inter-symbol and inter-carrier interference
Solution Approach 1:
The patent implements dynamic precoding configurations that can switch between linear and non-linear modes based on channel conditions. The system dynamically selects the appropriate precoding type (linear or non-linear) and adjusts the number of redundant symbols according to the measured delay spread, allowing the system to adapt to varying channel characteristics without being locked into a fixed complex configuration.
Solution Approach 2:
The patent changes the precoding parameter from fixed linear to variable non-linear configurations. By introducing a parameter that controls the degree of non-linearity and the number of redundant symbols, the system can adjust its behavior to match channel conditions, effectively handling larger delay spreads when needed while maintaining simplicity when channel conditions are good.
2Reliability
If non-linear precoding configuration is used for message transmission, then the system can handle larger delay spreads and reduce interference, but the system increases in complexity
Solution Approach 1:
The patent segments the precoding configuration into multiple selectable types (linear, non-linear with different numbers of redundant symbols). Instead of implementing a single complex non-linear precoding system, the patent divides the solution into discrete configuration options that can be selected based on channel conditions, reducing the overall system complexity while maintaining the ability to achieve high reliability when needed.
Solution Approach 2:
The patent applies non-linear precoding only partially - specifically, only when channel conditions require it (larger delay spreads). The system uses linear precoding for simple cases and introduces non-linear precoding with redundant symbols only when necessary to handle interference, avoiding the full complexity of non-linear precoding in all situations.
3Reliability
If the number of redundant symbols is increased to handle larger delay spreads, then the system improves data detection accuracy, but the transmission efficiency decreases
Solution Approach 1:
The patent dynamically adjusts the number of redundant symbols based on the measured delay spread and channel conditions. When delay spread is small, the system uses zero or few redundant symbols, maintaining high transmission efficiency. When delay spread increases and interference becomes problematic, the system increases the number of redundant symbols to improve data detection accuracy, optimizing the trade-off between reliability and productivity in real-time.
Solution Approach 2:
The patent treats the number of redundant symbols as a variable parameter that can be adjusted according to channel conditions. By changing this parameter dynamically rather than fixing it at a high value, the system achieves high reliability when needed while maintaining high transmission efficiency under normal conditions, effectively managing the trade-off between these two parameters.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A transmitting device may precode, according to a configuration, redundant symbols and data symbols to generate a message, the configuration comprising a non-linear precoding configuration. The transmitting device may transmit, to a receiving device, an indication of the configuration. The transmitting device may transmit the message to the receiving device according to the configuration.