There are many key technologies about the single-user detection, such as synchronization between receiver and transmitter, channel estimation and diversity.
单用户检测中的关键技术很多，主要有接收端和发送端的同步，信道估计和分集等。
2
The open loop transmit diversity scheme, named as STTD, and two feedback close loop transmit diversity schemas in downlink channel communication was defined in WCDMA standard.