WLAN Index Modulation Using DRU Tone Selection and Energy Detection
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Solution Overview
Problem
The application of index modulation in standardized systems such as Wi-Fi™ 8 and systems utilizing DRU tone plans has not been sufficiently developed, necessitating methods and systems for improved index modulation in wireless local area networks (WLANs).
Innovation Solution
A method involving parsing a bit sequence into two sequences, selecting tones from distributed resource units (DRUs) based on the first sequence, and generating and transmitting modulation symbols using these tones, while refraining from transmitting on non-selected DRU tones, is employed. A receiver determines the used tones and combines recovered sequences to decode the transmitted information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If index modulation is applied to DRU tone plans in Wi-Fi 8 systems, then communication efficiency and data rate are improved, but system complexity and implementation difficulty increase
Solution Approach 1:
The bit sequence is divided into two separate sequences: a first sequence used for tone selection and a second sequence used for modulation symbol generation. This segmentation allows the system to handle index modulation and conventional modulation independently, improving communication efficiency while managing system complexity through modular processing
Solution Approach 2:
The system maintains compatibility with existing Wi-Fi 8 DRU tone plan structures while adding index modulation functionality. The same tone selection mechanism serves both traditional modulation purposes and index modulation purposes, allowing the system to achieve improved productivity without requiring completely separate infrastructure
2Loss of information
If multiple DRUs are used for index modulation, then information embedding capacity is improved, but tone selection and resource allocation complexity increase
Solution Approach 1:
The patent extends index modulation from single-DRU to multi-DRU scenarios by adding a dimensional aspect of tone selection across multiple DRUs. The first sequence selects specific tones from multiple DRUs, while the second sequence generates modulation symbols, creating a two-dimensional information embedding space that increases capacity while structured selection processes manage complexity
3Use of energy by moving object
If non-selected DRU tones are refrained from transmitting, then energy efficiency is improved, but signal distribution and resource management complexity increase
Solution Approach 1:
The system extracts and activates only the specific tones selected by the first sequence from the available DRU tones, while deactivating or refraining from transmitting on non-selected tones. This extraction approach improves energy efficiency by concentrating transmission power on selected tones, while the structured tone selection process based on the bit sequence manages the complexity of resource allocation
Data Source
AI summary
Methods, systems and apparatus related to index modulation for WLAN (IEEE 802.11) are provided. An information-carrying bit sequence to be transmitted is separated into two parts. The first part is used as the basis for selecting tones from distributed resource units (DRUs) which are defined for use in transmission of a frame. The second part is used as the basis for generating modulation symbols for transmission. The modulation symbols are then transmitted using the selected tones. At the receiver, the tones which are used are determined by an energy detection method, and the modulation symbols are also decoded. A recovered bit sequence is generated based on the determined tones and the modulation symbols. Where there are N DRUs, each having T tones, T groups of tones can be defined. From each group of tones, one tone is selected based on a sub-part of the bit sequence's first part.