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DHT-Based OFDM System for Passband Transmission Over Frequency-Selective Channel

In this letter, a multicarrier modulation transceiver based on discrete Hartley transform (DHT) is investigated. The diagonalization of channel matrix is an important feature for the DFT-OFDM system. However, the conventional DHT-OFDM system cannot directly diagonalize the multipath fading channel so that the intercarrier coupling (ICC) effects will occur. To deal with this problem, we devise a new DHT-based OFDM architecture that can perfectly diagonalize the channel matrix by using the complementary property of DHT matrix. In addition, two-dimensional complex signaling, such as quadrature amplitude modulations (QAM), can also be applied to the proposed structure for bandwidth efficient transmission. The compatibility of DFT-OFDM and DHT-OFDM systems is also considered. Finally, numerical simulations shows the validity of the proposed DHT-based OFDM system.