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IEEE Communications Surveys & Tutorials > 2012 > 14 > 3 > 836 - 857
IEEE Signal Processing Letters > 2010 > 17 > 3 > 257 - 260
IEEE Communications Surveys & Tutorials > 2012 > 14 > 3 > 836 - 857
IEEE Signal Processing Letters > 2010 > 17 > 3 > 257 - 260