WLAN MRU Subcarrier Duplication and Shuffling for Frequency Diversity
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Solution Overview
Problem
Current Wi-Fi technologies, particularly in the 6 GHz band, face limitations in frequency diversity and spectrum usage efficiency due to the lack of effective methods for duplicating and shuffling dual carrier modulation (DCM)-encoded data subcarriers across multiple resource units (MRUs), which restricts coverage range and spectral efficiency.
Innovation Solution
The proposed solution involves an apparatus and method that encode data bits for transmission over MRUs in a WLAN, using an encoder, segment parser, constellation mapper, and transmitter to duplicate and shuffle DCM-encoded data subcarriers across RUs, along with LDPC tone mapping to enhance frequency diversity and spectrum usage efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If transmit bandwidth is increased to boost transmitter power and extend coverage range, then coverage range is improved, but noise power increases and link performance deteriorates
Solution Approach 1:
The patent applies signal duplication by transmitting multiple copies of the same encoded data subcarriers across different resource units. The encoder generates duplicate copies of the modulated signal, and these copies are transmitted over multiple RUs within the MRU structure. This copying approach increases the effective signal energy without proportionally increasing noise, thereby improving link performance while maintaining extended coverage range.
Solution Approach 2:
The patent segments the transmitted signal into multiple encoded data subcarriers that are distributed across different resource units within the MRU. Instead of transmitting a single wideband signal, the signal is divided and replicated across multiple narrower bandwidth segments (RUs), which helps manage noise power while maintaining overall coverage range.
2Reliability
If DCM-encoded data subcarriers are duplicated within single RU, then frequency diversity is improved, but spectrum usage efficiency deteriorates
Solution Approach 1:
The patent extends the duplication strategy from the single-dimension approach (within one RU) to a multi-dimensional approach by distributing duplicate encoded data subcarriers across multiple resource units in the frequency domain. This dimensional expansion allows the system to achieve frequency diversity benefits while more efficiently utilizing the available spectrum resources across the MRU.
Solution Approach 2:
The patent merges the duplication function with the multi-resource-unit transmission structure. Instead of duplicating signals separately within each RU and then combining them, the system integrates the duplication process across the MRU structure, where encoders generate copies that are naturally distributed across multiple RUs, thereby improving spectrum usage efficiency while maintaining frequency diversity.
3Device complexity
If duplicate mode is implemented for single RU only, then implementation complexity is reduced, but adaptability to multiple resource units deteriorates
Solution Approach 1:
The patent creates a universal duplication mechanism that functions across both single RU and multiple RU scenarios. The encoder is designed to generate duplicate encoded data subcarriers that can be distributed across any number of resource units within an MRU structure. This universal approach maintains relatively simple implementation complexity while achieving high adaptability to support MRU operations, as the same basic duplication principle applies regardless of whether one or multiple RUs are used.
Data Source
AI summary
The disclosed systems and methods for wireless communication directed are towards (i) encoding data bits to be transmitted over a multiple resource unit (MRU) in a wireless local area network (WLAN), (ii) creating a group of the encoded data bits based on a predetermined criterion, (iii) parsing the encoded bits in the group based on a proportional ratio associated with the MRU, (iv) modulating the parsed encoded data bits to generate modulated encoded data symbols, (v) mapping the modulated encoded data symbols to data subcarriers to generate encoded data subcarriers, the data subcarriers being associated with respective resource units (RUs) of the MRU, (vi) duplicating the encoded data subcarriers within the respective RUs, (vii) shuffling the duplicate encoded data subcarriers across the respective RUs of the MRU, and (viii) transmitting the encoded data subcarriers, and the duplicate encoded data subcarriers over the MRU in the WLAN.