Section: 6.3.4.3 Precoding for transmit diversity
Content: Precoding for transmit diversity is only used in combination with layer mapping for transmit diversity as described in clause 6.3.3.3. The precoding operation for transmit diversity is defined for two and four antenna ports. For transmission on two antenna ports, , the output , of the precoding operation is defined by for with . For rank=1 transmission on two antenna ports, , the output , of the precoding operation is defined by where . For transmission on four antenna ports,, the output , of the precoding operation is defined by for with .