Soft Modulation Symbol Quantization for RF Compliance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional data forwarding methods, such as decoding forwarding, degrade when a forwarding node incorrectly decodes data, and soft modulation signals often exceed the requirements of intermediate frequency/radio frequency devices due to high peak to average power ratio (PAPR) and error vector magnitude (EVM), making it difficult to transmit these signals.
Innovation Solution
The method involves quantizing soft modulation symbols to a limited number of constellation points before transmission, ensuring that the generated signal meets the requirements of intermediate frequency/radio frequency devices by reducing PAPR and EVM, thereby allowing successful transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soft modulation is used to enable forwarding when decoding is incorrect, then forwarding performance is improved, but the signal generates excessively large PAPR and EVM that exceed intermediate frequency/radio frequency device requirements
Solution Approach 1:
The patent applies parameter changes by quantizing the soft modulation symbols to map them onto a limited set of constellation points. This transforms the continuous soft modulation parameters into discrete values that conform to standard modulation schemes (such as QPSK, 16QAM, 64QAM), thereby reducing PAPR and EVM to levels acceptable for intermediate frequency and radio frequency devices while preserving the ability to forward data even when initial decoding fails
2Object-affected harmful factors
If conventional decoding forwarding is used, then intermediate frequency/radio frequency device requirements are met, but forwarding performance degrades when decoding is incorrect
Solution Approach 1:
The patent introduces an intermediary processing step between soft modulation and transmission. The quantization module acts as a mediator that transforms the problematic soft modulation symbols into compliant hard modulation symbols. This intermediary process enables the system to benefit from soft modulation's forwarding capability while eliminating its harmful effects on intermediate frequency and radio frequency devices
Data Source
Figure 1~3A
Figure 3B~3D
Figure 4
AI summary
This application provides a data sending method and apparatus. The method includes: A node generates a first modulation symbol corresponding to a first modulation scheme. The node quantizes the first modulation symbol to obtain a target symbol. The target symbol corresponds to one of a plurality of constellation points of a second modulation scheme. The node preprocesses the target symbol to obtain to-be-sent data. The preprocessing includes one or more of layer mapping, antenna port mapping, precoding, or transform precoding. The node maps the to-be-sent data to a physical resource, and sends the to-be-sent data by using the physical resource. According to the provided embodiments, a soft modulation symbol generated through soft modulation may be quantized to a limited quantity of constellation points before being sent, so as to meet a requirement of an intermediate frequency indicator/a radio frequency indicator.