3gpp组织，lte下行链路，预编码。与检测！预编码的过程，非常的详细！

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

Designing energy efficient mobile communication system is the main challenge for the LTE researchers due to increasing of users and their demands in accessing broadband services on mobile phones. High data rate, reduced Bit Error Rate (BER) and l