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Filter Bank Multicarrier Transmission Based on the Discrete Hartley Transform

This paper presents a new filter bank multicarrier (FBMC) transmission scheme that uses the real-valued discrete Hartley transform (DHT) for both multicarrier modulation and demodulation, rather than the complex-valued inverse discrete Fourier transform (IDFT) and DFT for multicarrier modulation and demodulation respectively in conventional FBMC systems. The DHT-FBMC scheme is with quadrature amplitude modulation (QAM) and adopts a pair of orthogonal or nearly orthogonal pulse shaping filters, one for even-numbered subcarriers and the other for odd-numbered subcarriers, to mitigate self-interference. The proposed method potentially has advantages in terms of performance and implementation, due to the fact that it possesses some distinct channel diversity on mirror-symmetrical subcarriers and involves identical real-valued transform operations at the transmitter and receiver. In contrast to existing DFT-FBMC systems using QAM or offset QAM (OQAM), the DHT-FBMC scheme using QAM achieves better bit-error-rate performance with comparable or reduced computational complexity.