IEEE Communications Letters
IEEE Communications Letters > 2009 > 13 > 3 > 193 - 195
IEEE Communications Letters > 2009 > 13 > 9 > 682 - 684
IEEE Communications Letters > 2009 > 13 > 3 > 193 - 195
IEEE Communications Letters > 2009 > 13 > 9 > 682 - 684