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IEEE Communications Letters > 2014 > 18 > 5 > 877 - 880
IEEE Transactions on Communications > 2013 > 61 > 4 > 1231 - 1241
IEEE Communications Letters > 2009 > 13 > 4 > 265 - 267
IEEE Transactions on Communications > 2009 > 57 > 2 > 388 - 403