6G • RAN
SDMA 2.0
Near-Field Spatial Division Multiple Access
Spatial multiplexing taking advantage of near-field spherical wavefronts to separate users along both radial distance and angular azimuth simultaneously.
Technical Explanation
Traditional Spatial Division Multiple Access (SDMA) relied on angular beam separation: if two users were located along the exact same compass direction from the base station, they could not be separated spatially. SDMA 2.0 leverages near-field spherical wavefront curvature from XL-MIMO arrays. The base station focuses energy into distinct focal spots at different distances along the same line-of-sight angle, allowing concurrent transmission to multiple users without mutual interference.
Key Functions
- Simultaneous spatial multiplexing of users located along the exact same angular azimuth
- Radial depth-domain user separation enabled by spherical wavefront curvature
- Dramatic expansion of spatial multiplexing capacity in dense urban street canyons
- Zero inter-user interference achieved through focal distance energy containment
- Integration with 6G high-accuracy positioning to dynamically target user focal spots
Specifications
IEEE Transactions on Signal Processing, 6G Wireless Research
Interfaces
SDMA2-EngineDepth-Beam-PHY
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