OFDMA Uplink Transmission via Subchannel Segmentation and Phase Rotation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless local area network (WLAN) technologies face challenges in efficiently transmitting data in congested environments, particularly in achieving high throughput and reducing Peak-to-Average Power Ratio (PAPR) while maintaining compatibility with legacy systems.
Innovation Solution
The method involves determining whether to transmit medium access control protocol data units (MPDUs) via a single channel or multiple subchannels, using a larger Fast Fourier Transform (FFT) size to increase the number of OFDM subcarriers per unit frequency, and implementing phase rotation techniques to decrease PAPR, while ensuring backward compatibility with existing IEEE standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data is transmitted via multiple subchannels using OFDMA, then transmission efficiency and throughput are improved, but device complexity and system design difficulty increase
Solution Approach 1:
The patent divides the wireless transmission channel into multiple orthogonal subchannels using OFDMA technology. Each subchannel can independently transmit data to different receiving stations, enabling parallel transmission and improving overall system throughput while maintaining manageable complexity through modular channel structure
Solution Approach 2:
The patent introduces frequency domain division by utilizing multiple orthogonal subchannels across different frequency resources. This dimensional expansion from single-channel to multi-channel transmission enables simultaneous data flows to multiple stations, significantly enhancing transmission efficiency without requiring additional spatial dimensions
2Productivity
If larger FFT size is used to increase OFDM subcarriers, then data throughput is improved, but Peak-to-Average Power Ratio (PAPR) increases
Solution Approach 1:
The patent applies phase rotation techniques that modify the phase parameters of OFDM subcarriers. By rotating the phase of individual subcarriers before transmission, the patent reduces the peak power amplitude while preserving the data-carrying capacity, thereby lowering PAPR without sacrificing throughput achieved through large FFT sizes
3Productivity
If new WLAN technologies are implemented to increase throughput, then transmission capacity is improved, but compatibility with legacy systems deteriorates
Solution Approach 1:
The patent designs the OFDMA transmission system to serve multiple functions: it can simultaneously support legacy single-channel transmissions and new multi-channel OFDMA transmissions. The system maintains universal compatibility by allowing legacy stations to operate on single channels while new stations can utilize multiple subchannels, enabling coexistence across different WLAN standards and capability levels
Data Source
AI summary
A method for transmitting data in a wireless local area network and the device using the same are provided. A device transmits a plurality of data units via one or more subchannels. The plurality of data units have same access categories.