IEEE Communications Letters
IEEE Communications Letters > 2008 > 12 > 9 > 615 - 617
IEEE Communications Letters > 2008 > 12 > 9 > 684 - 686
IEEE Communications Letters > 2008 > 12 > 9 > 636 - 638
IEEE Communications Letters > 2008 > 12 > 9 > 690 - 692
IEEE Communications Letters > 2008 > 12 > 9 > 681 - 683