These paper describe a technology of precoding in SDMA (space division multi access) and muti-hop is applied in LTE

Precoding in SDMA\A Limited Feedback Joint Precoding for AF relay networks TSP10.pdf
.................\Joint Precoding Optimization for Multiuser Multi-Antenna Relay DL channels using Quadratic Progra TCOM11.pdf
.................\Joint Source and Relay Precoding Designs for MIMO 2-way relay com TWC11.pdf
.................\Multiuser Multi-Hop MIMO Relay Systems with TV channels TWC11.pdf
.................\Optimized Constellations for Two–Way Wireless Coop with Physical NetCoding JSAC09 Tarokh.pdf
Precoding in SDMA

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