A low complexity real-valued kernel DHT-based OFDM modulator/demodulator design

Chen, Pei-Shin; Jao, Chin-Kuo; Shiue, Muh-Tian

doi:10.1109/iscas.2009.5118059

Cited by 2 publications

(4 citation statements)

References 11 publications

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“…This also falls in line with the previous results obtained in (13). It is also important to mention here that for k = 0 and k = N/2, the expression for the received signal in (15) reduces to…”

Section: Discussionsupporting

confidence: 92%

“…Similar results were also reported in [13] for optical DHT-OFDM with no improvement in system performance over DFT-OFDM. In [14][15][16], the inability of the DHT to diagonalize the channel matrix was taken into consideration, and a transmitter/receiver architecture was devised to diagonalize the channel matrix. The devised system requires modification of both the transmitter and the receiver and is applied to quadrature amplitude modulation (QAM) signals where the IDHT/DHT is performed on both the inphase and the quadrature components of the QAM signal separately.…”

Section: Introductionmentioning

confidence: 99%

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Frequency-domain subcarrier diversity receiver for discrete Hartley transform OFDM systems

Al-Gharabally

Almutairi

2019

J Wireless Com Network

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In recent years, there has been an increasing interest in the use of the discrete Hartley transform (DHT) for orthogonal frequency-division multiplexing (OFDM). Previous studies have not reported an improvement in bit error rate (BER) when using a DHT-based OFDM without substantial complexity increase due to the fact that the DHT cannot diagonalize a circulant channel matrix but rather produces a unique structured matrix that has only a main diagonal and anti-diagonal. In this paper, the coupling between symmetric carriers is exploited by introducing a frequency-domain subcarrier diversity receiver for DHT-based OFDM systems. The proposed simple receiver structure takes advantage of the coupling to enhance the BER performance of the DHT-OFDM system by increasing the diversity gain between subcarriers. A detailed statistical and performance analysis of the system is presented, in which closed-form expressions of the average BER were derived. The proposed system performance was compared to the conventional discrete Fourier transform OFDM (DFT-OFDM), the generalized DHT-OFDM, and the DHT-precoded OFDM systems in terms of average BER and peak-to-average power ratio (PAPR). The proposed DHT-OFDM system outperforms the generalized DHT-OFDM system by 12 dB and outperforms the conventional DFT-OFDM and the DHT-precoded OFDM systems by 17 dB at an average BER of 10 −5. In terms of PAPR, the proposed DHT-OFDM system suffers from an approximately 5.5, 2, and 1 dB increase in PAPR when compared to the DHT-precoded OFDM, the conventional DFT-OFDM, and the generalized DHT-OFDM systems, respectively.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Frequency-domain subcarrier diversity receiver for discrete Hartley transform OFDM systems

Al-Gharabally

Almutairi

2019

J Wireless Com Network

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“…However, from practical implementation aspects, the two systems are quite different. In [13], we have presented that the proposed 64-point DHT-OFDM (de)modulator could save about 59% multiplications and 28% additions compared with the radix-2 FFT. Thus, the proposed DHT-OFDM system may have the potential to be another choice to implement the multicarrier OFDM systems.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…The received signal of the mixed DFT-OFDM transmitter and DHT-OFDM receiver can be written as (13) In order to determine whether the DHT-OFDM receiver is compatible with DFT-OFDM transmitter, we should evaluate the diagonalization characteristics of the mixed system for the frequency-selective channel. Now, let .…”

Section: B Compatibility Considerationmentioning

confidence: 99%

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

Jao

Long

Shiue

2010

IEEE Signal Process. Lett.

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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. Index Terms-Circulant matrix, discrete Hartley transform (DHT), intercarrier coupling (ICC), orthogonal frequency-division multiplexing (OFDM), trigonometric transform.

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A low complexity real-valued kernel DHT-based OFDM modulator/demodulator design

Cited by 2 publications

References 11 publications

Frequency-domain subcarrier diversity receiver for discrete Hartley transform OFDM systems

Frequency-domain subcarrier diversity receiver for discrete Hartley transform OFDM systems

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

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