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IEEE/ICACT20220275 Slide.17        [Big Slide]	Oral Presentation
	The L1-ball projection has the feature of sparse representation where many weights are zero. The advantage of this is that estimation is fast, and interpretability is improved because the number of extra explanatory variables is reduced. However, there is a disadvantage that the number of explanatory variables is reduced too much. Therefore, it is used when only some features are important and fast calculation is required. The L2-ball projection does not have sparse representation, so it is used when all features 𝐰 are important and overtraining is to be prevented. Assuming that the user side cannot be equipped with many antenna elements, the number of OAM modes will be small. Therefore, the weights for all the OAM modes are important, and L2 is adopted.

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