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In the March 2007 paper named above (pp. 14-23), the authors found the following error. The optimality of the detector is only valid for c = 2, which is a Gaussian distribution. The performance and results of the detector when c ≠ 2 as presented in the paper are still valid. However, in this case the detector is suboptimal. Equations (21)??(26) and (28) should be modified as described and the computational complexity of the detector is the same as the detector developed in reference .