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Unformatted text preview: different users based on the channel gains they perceive at any given time. Let c k,n represent the corresponding element of a K by N matrix of indicator variables. c k,n is 1 if subcarrier n is assigned to user k and 0 otherwise.  proved that the total data rate of the multi-user OFDMA system is maximized when a subcarrier is allocated to exactly one user during a given OFDM symbol period. To ensure that each subcarrier is allocated to exactly one user at a given time, c k,n is subject to the following constraints: c m , n = 1, ∀ n ∀ m ∑ and c m , n = N ∀ n ∑ ∀ m ∑ …(E15) Now that I have described the setup for the multi-user scenario, let us move onto the detailed discussion of MA and RA approaches....
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This note was uploaded on 09/27/2009 for the course ECE 399 taught by Professor Prof during the Spring '09 term at University of Texas at Austin.
- Spring '09