Helper Nodes Create High-Rank Channels for Blocked mmWave Multiplexing
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Solution Overview
Problem
Existing wireless communication systems face challenges in achieving high effective rank channels due to blockage and severe pathloss, particularly in millimeter wave frequencies, limiting simultaneous spatially multiplexed transmissions to multiple receivers.
Innovation Solution
Creating a high effective rank channel between a transmitter and an anchor node using a combination of helper nodes, including helper RISs and/or helper repeaters, which amplify signals and mitigate pathloss through spatial domain multiplexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spatial domain multiplexing is used to transmit multiple layers to multiple receivers, then system throughput and spectral efficiency are improved, but channel blockage and severe pathloss occur particularly in millimeter wave frequencies
Solution Approach 1:
The patent introduces intermediate nodes (relay nodes, reflectors, or lens elements) between the transmitter and receivers to establish indirect transmission paths. These intermediaries reflect, refract, or relay signals around blockages, enabling spatial domain multiplexing to function reliably in millimeter wave frequencies where direct line-of-sight is frequently blocked.
2Productivity
If more transmission layers are multiplexed simultaneously to increase data rate, then spectral efficiency is improved, but the complexity of channel management and signal processing increases
Solution Approach 1:
The patent segments the overall communication system into independent transmission paths, each carrying a separate data layer through different spatial routes. This segmentation allows each path to be managed independently, reducing the complexity of coordinating multiple multiplexed layers while maintaining high spectral efficiency through parallel transmission.
3Reliability
If helper nodes are introduced to create high effective rank channels, then channel capacity is improved, but the device complexity and network topology complexity increase
Solution Approach 1:
The patent designs helper nodes with multi-functionality, enabling them to perform multiple roles such as signal relaying, reflection, beamforming, and channel state feedback. This universality reduces the overall network complexity by using a single type of node for multiple purposes rather than requiring specialized nodes for each function.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a transmitter may transmit, to a first receiver and via an anchor node, a first layer of data. The transmitter may transmit, to a second receiver and via one or more helper nodes and the anchor node, a second layer of data, wherein the second layer of data is spatial domain multiplexed with the first layer of data, and a high effective rank channel is created between the transmitter and the anchor node using a combination of the one or more helper nodes. Numerous other aspects are described.