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.

WCDMA标准在下行信道传输中采用了称作STTD的开环发射分集方案和两种反馈模式的闭环发射分集方案。

youdao

According to space time block coding based transmitting antenna diversity (STTD) in the WCDMA system, this paper presents a reception scheme based on maximal ratio combining (MRC).

针对WCDMA下行链路空时编码发送分集(STTD)确定了基于最大比合并(mrc)的分集接收方案，并对其进行了性能分析。

youdao

Orthogonal transmit diversity (OTD) and space-time spreading (STS) have been included in the 3gpp2 standard, while space-time transmit diversity (STTD) is one part of the 3gpp standard.

包括应用在3gpp 2标准中正交传输分集(otd)和空时扩频(STS)，另外空时传书分集作为3gpp传输标准的一部分。

youdao