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IEEE Communications Letters > 2008 > 12 > 2 > 115 - 117
IEEE Transactions on Signal Processing > 2008 > 56 > 8-1 > 3638 - 3651
IEEE Transactions on Wireless Communications > 2007 > 6 > 10 > 3641 - 3647
IEEE Transactions on Wireless Communications > 2007 > 6 > 7 > 2438 - 2443