IEEE Communications Letters
IEEE Communications Letters > 2008 > 12 > 3 > 216 - 218
IEEE Communications Letters > 2008 > 12 > 4 > 256 - 258
IEEE Communications Letters > 2008 > 12 > 3 > 216 - 218
IEEE Communications Letters > 2008 > 12 > 4 > 256 - 258