Wireless Probabilistic Shaping with Independent Channel Coding
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Solution Overview
Problem
Existing probabilistic shaping frameworks in wireless communications systems often couple shaping and channel coding, limiting flexibility and reducing performance, especially in retransmissions and resource-specific shaping.
Innovation Solution
A probabilistic shaping framework where shaping and channel coding are independent, allowing for separate encoding and modulation of information and shaping bits, with shaping bits transmitted separately to enable selective resource-specific shaping and alignment with coding systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If shaping and channel coding are coupled in existing probabilistic shaping frameworks, then the structure is simplified, but flexibility for coding parameters is reduced
Solution Approach 1:
The patent segments the previously coupled shaping and channel coding operations into independent processes. Shaping bits are generated separately from information bits, and channel coding is applied independently to information bits. This segmentation allows each process to be optimized separately, maintaining structural simplicity while enabling flexible adjustment of coding parameters without affecting the shaping process.
2Reliability
If probabilistic shaping is performed prior to channel coding using systematic channel codes, then shaping is preserved after coding, but flexibility for coding parameters is limited
Solution Approach 1:
The patent extracts the shaping operation from the channel coding process by introducing separate shaping bits that are generated independently. The shaping process operates on information bits to produce shaped information bits, while channel coding operates separately on the original information bits. This extraction allows shaping preservation through the coding process while enabling flexible selection of channel coding parameters independent of the shaping mechanism.
3Adaptability or versatility
If shaping bits are transmitted separately from information bits, then selective resource-specific shaping is enabled, but device complexity increases
Solution Approach 1:
The patent introduces shaping bits as an intermediary element that carries shaping information separately from the main information bits. These shaping bits serve as a mediator between the shaping process and the channel decoding process, enabling the receiver to reconstruct the shaping distribution and apply appropriate despreading operations. This intermediary approach enables selective resource-specific shaping while managing complexity through structured bit separation and independent processing paths.
Data Source
AI summary
Methods, systems, and devices for a framework for probabilistic shaping and channel coding for wireless signals are described to support a probabilistic shaping framework for higher-order modulations in which shaping and channel coding may be independent. A transmitting device may shape a set of information bits using a set of masking bits. The transmitting device may encode, shape, modulate, and transmit information bits to a receiving device, and the receiving device may demodulate, deshape, and decode the received information bits. In addition to transmitting the information bits to the receiving device, the transmitting device may also transmit a set of shaping bits, which may be indicative of the set of masking bits used to shape the information bits. The receiving device may use the set of shaping bits to generate the set of masking bits, and may use the set of masking bits to deshape the received information bits.