WLAN Orthogonal Multiplexing Without Channel State Information
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Solution Overview
Problem
Current wireless local area networks (WLANs) face inefficiencies in transmitting data to multiple client devices simultaneously, as they require channel state information (CSI) for multiplexing, which increases overhead and limits data throughput.
Innovation Solution
The implementation of orthogonal multiplexing techniques, such as space-time block coding and quadrature amplitude modulation (QAM), allows for the transmission of independent data streams to multiple devices on a single symbol stream without using CSI, reducing overhead and enabling simultaneous data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If channel state information (CSI) is used for multiplexing multiple data streams, then data transmission to multiple devices can be achieved, but overhead increases and data throughput is limited
Solution Approach 1:
The patent extracts and removes the requirement for channel state information (CSI) from the multiplexing process. By using orthogonal multiplexing techniques such as space-time block codes and QAM constellation mapping, the system achieves multiple data stream transmission without extracting or utilizing CSI, thereby eliminating the overhead associated with CSI acquisition, feedback, and processing while maintaining productive data throughput
2Productivity
If multiple individual symbol streams are multiplexed onto a single combined symbol stream without CSI, then overhead is reduced and simultaneous transmission is enabled, but interference management becomes more challenging
Solution Approach 1:
The patent changes the parameters of the multiplexing process by using orthogonal multiplexing techniques (space-time block codes and QAM constellation mapping) that inherently provide interference management properties. These parameter changes enable multiple data streams to be combined into a single symbol stream while maintaining orthogonality, thus reducing interference between streams without requiring CSI for interference coordination
Data Source
AI summary
In a method for transmitting information in a wireless local area network (WLAN), a plurality of different data streams corresponding to a plurality of different devices are orthogonally multiplexed onto a single symbol stream without using channel state information corresponding to a plurality of channels between a transmitting device and the plurality of different devices. One or more transmit streams are generated using the single symbol stream.