Title :
DHT-Based OFDM System for Passband Transmission Over Frequency-Selective Channel
Author :
Jao, Chin-Kuo ; Long, Syu-Siang ; Shiue, Muh-Tian
Author_Institution :
Dept. of Electr. Eng., Nat. Central Univ., Chungli, Taiwan
Abstract :
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.
Keywords :
OFDM modulation; discrete Hartley transforms; fading channels; matrix algebra; multipath channels; quadrature amplitude modulation; transceivers; DFT-OFDM system; DHT-based OFDM system; QAM; bandwidth efficient transmission; channel matrix diagonalization; discrete Hartley transform; frequency-selective channel; intercarrier coupling effect; multipath fading channel; numerical simulations; passband transmission; quadrature amplitude modulations; two-dimensional complex signaling; Couplings; Discrete Fourier transforms; Discrete transforms; Fading; Frequency division multiplexing; OFDM modulation; Passband; Pulse modulation; Quadrature amplitude modulation; Symmetric matrices; Circulant matrix; discrete Hartley transform (DHT); intercarrier coupling (ICC); orthogonal frequency-division multiplexing (OFDM); trigonometric transform;
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2010.2051618
