GMMSEGroup Minimum Mean Square Error
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Given that the data in [[THETA].sub.B] is less reliable, more powerful GMMSE method can be utilized [20].
On the other hand, when noise impact is relatively large, the difference between MMSE and GMMSE becomes dominant.
The Combination of MMSE and GMMSE is adopted and good results are obtained with significantly reduced effort compared to pure GMMSE scheme.