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IEEE Transactions on Wireless Communications > 2009 > 8 > 6 > 2737 - 2741
IEEE Communications Surveys & Tutorials > 2009 > 11 > 2 > 87 - 105
IEEE Transactions on Wireless Communications > 2008 > 7 > 9 > 3323 - 3328
IEEE Transactions on Signal Processing > 2007 > 55 > 12 > 5873 - 5879