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Unformatted text preview: n (E28) where p n P max n (E29) and p n 0, n (E30) In the above equations, the noise power per subcarrier is given by 2 and h n is the channel gain seen by the user for subcarrier n . is defined as the SNR gap, i.e. the difference between the SNR needed to obtain a certain data rate and the SNR needed to reach the theoretical limit. P max is the maximum power that can be transmitted. Now consider the multiuser cellular system of section 4.1.1 that uses OFDMA for the downlink. For the purpose of this subsection, the system of Figure 11 employs some RA resource allocation algorithm/approach that will maximize the total data rate while using a fixed amount of power. The employed RA algorithm will also allocate a nonnegative power p n for each subcarrier n such that the total power is less than P max [26]: p n 0, n and p n P max n (E31)...
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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
 Prof

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