Modems White Papers

Frequency-Time Block Codes for OFDMA Uplink Applications

Overview Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier block modulation scheme primarily used in high bit rate systems to mitigate inter-symbol interference (ISI) due to delay spread in multipath wireless channels. The annoying effect of ISI is almost all removed by the insertion of a cyclic prefix (or postfix) extension. However, during the transmission, ISI may also provides a multipath diversity advantage if the path gains fade independently on the different subcarriers. In this case, diversity translates in frequency diversity when Discrete Fourier Transform (DFT) is performed at the receiver.

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PublisherUniversité Laval File FormatPDF, requires Acrobat Rdr 5
Date PublishedApril 2004 Downloads20
FormatWhite Papers   
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