IEEE Communications Letters
IEEE Communications Letters > 2012 > 16 > 6 > 769 - 772
IEEE Communications Letters > 2012 > 16 > 9 > 1442 - 1445
IEEE Communications Letters > 2012 > 16 > 6 > 769 - 772
IEEE Communications Letters > 2012 > 16 > 9 > 1442 - 1445