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what means this Kind of subcarrier mapping?

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Big.Head

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The logical frequency subcarriers 1 to 61 are mapped to the same numbered IFFT inputs while the logical frequency subcarriers –61 to –1(How can i mapping the complex Data into logical frequency -60 to -1: what's means the logical frequency -61 to -1 ) are mapped into IFFT inputs 67 to 127 respectively. The rest of the inputs, 62 to 66 and the 0 (DC) input, are set to zero?
regards,
 

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