Duplicated PPDU Subblocks With Phase Rotation for WLAN Range
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Solution Overview
Problem
Current wireless local area network (WLAN) systems face challenges in extending the transmission range and reliability of Extremely High Throughput (EHT) Physical Protocol Data Units (PPDUs, particularly in indoor environments using low power over a 6 GHz bandwidth, due to limitations in existing signaling techniques.
Innovation Solution
The proposed method involves duplicating and transmitting data in subblocks within the frequency domain for EHT PPDUs, using a structure that includes a preamble and data field with phase rotation, to enhance transmission reliability and range, specifically supporting the IEEE 802.11be standard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is transmitted using conventional signaling techniques in EHT WLAN system, then transmission speed and throughput are maintained, but transmission range and reliability deteriorate in indoor environments with low power usage
Solution Approach 1:
The frequency domain is divided into multiple subblocks, and data is segmented and transmitted in each subblock. This segmentation allows the transmission to be more robust against frequency-selective fading and improves reliability without requiring complex adaptive signaling techniques.
Solution Approach 2:
Data is duplicated and transmitted multiple times across different subblocks in the frequency domain. This copying approach provides redundancy that enhances transmission reliability and enables the receiver to recover data even if some transmissions are degraded, without complex error correction signaling.
2Use of energy by moving object
If low power is used for transmission in indoor environments, then energy consumption is reduced, but transmission range deteriorates
Solution Approach 1:
Data is transmitted periodically across multiple subblocks in the frequency domain. This periodic transmission structure allows low power usage while extending effective transmission range through frequency diversity, as the receiver can accumulate energy from multiple transmissions across different frequency subblocks.
Solution Approach 2:
The transmission is extended from a single frequency channel to multiple frequency subblocks, adding a frequency dimension to the transmission. This allows low power transmissions to achieve extended range by distributing energy across the frequency domain rather than concentrating it in a single channel.
3Reliability
If data is duplicated and transmitted in subblocks with phase rotation, then transmission range and reliability are improved, but device complexity increases
Solution Approach 1:
Different phase rotations are applied to different subblocks, creating local quality variations that improve reliability through diversity. This local differentiation is simple to implement and process, avoiding the need for complex global optimization algorithms.
Solution Approach 2:
Phase rotation parameters are changed across different subblocks to create diversity in the transmitted signals. This parameter variation improves reliability without requiring complex modulation schemes, as the phase changes are applied in a systematic and computationally efficient manner.
Data Source
AI summary
Proposed are a method and apparatus for receiving a PPDU in a wireless LAN system. In detail, a reception STA receives a PPDU from a transmission STA through a first band and decodes the PPDU. The PPDU includes a preamble and a data field. The first band includes first and second subblocks. The data field includes first data for the first subblock and second data for the second subblock. The first data is generated on the basis of data in which constellation mapping is performed on encoded data bits. The second data is generated on the basis of data obtaining by duplicating the first data and applying phase rotation thereto.