Bell Laboratories Layered Space Time

German: Bell Laboratories Layered Space Time
Japanese: ベル研階層化時空間

Communications engineering. A transmission technique for mobile radio and WLANs, developed by Bell Laboratories, which achieves a higher data rate using a lower bandwidth as other commonly used methods like WCDMA.
BLAST is based on the unavoidable effect in RF transmission, that waves have different delays due to reflection and obstacles in the propagation direction. That means a carrier send from point A reaches point B multiple times with different delays and differing amplitudes. Multiple antennas are deployed on the transmitter as well as on the receiver side. The user data stream is split into sub-streams which are sent concurrently in the same bandwidth over multiple antennas. On the receiver side each antennas sees a superposition of all sub-streams and their reflections. As the sub-streams are scattered slightly different the receiver can identify and recover them with mathematical methods.

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