Transmit diversity in 3G CDMA systems

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【文件名】:0677@52RD_Transmit diversity in 3G CDMA systems.rar
【格　式】:rar
【大　小】:100K
【简　介】:Transmit diversity (TD) is one of the key
contributing technologies to defining the ITU
endorsed 3G systems W-CDMA and cdma2000.
Spatial diversity is introduced into the signal by
transmitting through multiple antennas. The
antennas are spaced far enough apart that the
signals emanating from them can be assumed to
undergo independent fading. In addition to
diversity gain, antenna gain can also be incorporated
through channel state feedback. This leads
to the categorization of TD methods into open
loop and closed loop methods. Several methods
of transmit diversity in the forward link have
been either under consideration or adopted for
the various 3G standards. This article describes
the concept of transmit diversity and explains
the features of selected TD techniques.
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