【转载】本文注重分析目前MIMO多用户系统下行链路的三种预编码技术。

：多天线系统中发射端采用准正交空时编码（QOSTC）时，与正交空时编码（OSTC）相比，虽然前者可达到 全速率传输，-: multiple antenna systems used in the launch must orthogonal space-time coding (QOSTC), and the orthogonal space-time code than (OSTC), although the former can achieve The transmission r