| 摘要 |
A multicarrier Code Division Multiple Access (MC-CDMA) receiver forms an estimated interference signal <EMI ID=2.1 HE=6 WI=3 LX=583 LY=732 TI=UI> <PC>by estimating the transmitted signal <B>Z,</B> processing this (100-130) to give a hard or soft output value, reprocessing (140-170) this to give a new estimate <EMI ID=2.2 HE=6 WI=5 LX=1599 LY=847 TI=UI> <PC>and subtracting this from <B>Z.</B> The interference signal is then itself subtracted, after multiplication with channel estimate <EMI ID=2.4 HE=6 WI=5 LX=643 LY=1046 TI=UI> <PC>from the received signal <B>Y</B> to give <EMI ID=2.3 HE=6 WI=5 LX=1280 LY=1043 TI=UI> <PC>This is then combined at 60 according to a scheme such as Minimum Mean Square Error Combining (MMSEC). When enough iterations have occurred that little more improvement is possible, a different combination technique (eg. Maximal Ratio Combining, MRC) may be switched to via option selector 70. Such an iterative process can remove known and unknown interference, and support multimedia, multiuser service with multicode transmission as in Fig. 4.
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