IEEE Communications Letters
IEEE Communications Letters > 2008 > 12 > 9 > 624 - 626
IEEE Communications Letters > 2008 > 12 > 9 > 648 - 650
IEEE Communications Letters > 2008 > 12 > 9 > 624 - 626
IEEE Communications Letters > 2008 > 12 > 9 > 648 - 650