A Novel Low-Complexity Precoded OFDM System With Reduced PAPR

Wang, Sen-Hung; Li, Chih-Peng; Lee, Kuan-Chou; Su, Hsuan-Jung

doi:10.1109/tsp.2015.2389751

Cited by 65 publications

(40 citation statements)

References 22 publications

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“…Moreover, precoding is considered an efficient way to reduce the PAPR, by which the frequency diversity can be provided as well [13]. Since only simple linear computation is required, great promise in OFDM based VLC system has 2 Advances in Condensed Matter Physics been shown.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Zadoff-Chu Matrix Precoding for Visible Light Communication System with OFDM Modulation

Guo

2018

Advances in Condensed Matter Physics

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Light-emitting diode-(LED-) based visible light communication (VLC) has become a potential candidate for next generation high-speed indoor wireless communication. Due to the limited modulation bandwidth of the LED, orthogonal frequency division multiplexing (OFDM) modulation is particularly preferred in the VLC system to overcome the ISI, which suffers from the high peak-to-average power ratio (PAPR) and leads to severe performance loss. In this paper, we propose and experimentally demonstrate a novel Zadoff-Chu matrix (ZCM) precoding scheme, which can not only reduce the PAPR, but also provide uniform signal-to-noise ratio (SNR) profile. The theoretical analysis and simulation show that the proposed scheme achieves better PAPR performance compared with the traditional precoding schemes. The experimental demonstration further validates the bit error rate (BER) performance improvement, where the measured BERs are all below the 7% pre-forward error correction (pre-FEC) limit of 3.8 × 10 −3 when the transmitted data rate is 50 Mb/s.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Zadoff-Chu Matrix Precoding for Visible Light Communication System with OFDM Modulation

Guo

2018

Advances in Condensed Matter Physics

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“…This technique effectively combats frequency selective fading, mitigates inter-symbol interference (ISI), and achieves high spectral efficiency [10][11][12][13][14]. To further enhance system performance, cooperative strategies, such as beamforming [15] or distributed space-frequency coding (DSFC) [16], have been proposed in the content of OFDM cooperative network so as to attain full spatial and multipath diversity gains [17][18][19][20]. Most of existing cooperative strategies assume that CSI is perfectly known at the destination to perform message detection.…”

Section: Introductionmentioning

confidence: 99%

Semiblind Channel Estimation and Precoding Scheme in Two-Way Multirelay Networks

Wang

Huang

2017

IEEE Trans. Signal Process.

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Consider amplify-and-forward two-way relay networks with multiple relays and frequency selective fading channels, a low-complexity precoding scheme and semi-blind channel estimation method are proposed in this dissertation. Precoding is performed using a rotation-based matrix and decoding is low-complexity and easily scalable to the number of relays and/or the channel length since the decoding process requires only a circulant shifting of the received blocks. The composite channel impulse response of each source-relay-destination link is estimated based on the second-order statistics of the received signals. The ambiguity in the proposed channel estimates caused by the channel information of the direct link is eliminated using a small number of training blocks. The accuracy of the proposed semi-blind channel estimates is examined by deriving the mean square error of the channel estimates for two asymptotic cases, namely an infinite number of data blocks and a high signal-to-noise ratio (SNR) regime. The two cases thus provide a useful insight into the effects on the estimation performance of imperfect direct link information and statistical errors of the ensemble correlations, respectively. The asymptotic analyses are confirmed by the simulation results, which show that the normalized mean square error of the channel estimates varies inversely with the SNR and the number of data blocks. Keywords ─ ─ ─ ─ Two-way relay networks, semi-blind channel estimation, frequency-selective fading channels, low-complexity, precoding design, asymptotic analysis.iv

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“…On the other hand, SC‐FDE does not provide the same flexibility as OFDM in the management of bandwidth and power resources both in single and multi‐user cases . Recently, a low‐complexity pre‐coded OFDM based on the Walsh–Hadamard matrix is also designed to reduce the peak‐to‐average power ratio problem . Besides, the pre‐coding for OFDM schemes is used in relay multiple‐input multiple‐output systems as a jointly optimized pre‐coding design to improve bit error rate performance .…”

Section: Introductionmentioning

confidence: 99%

SINR analysis of FFH/OFDM over frequency selective Rayleigh fading channel

Oturak

Öztürk

2016

Wireless Communications

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Fast frequency hopping/orthogonal frequency division multiplexing (FFH/OFDM) has been previously proposed to achieve frequency diversity over frequency selective channels. However, the performances of the FFH/OFDM scheme have been usually calculated using simulations over empirical channel models in earlier works. The main aim of this paper is to theoretically expose the diversity of the FFH/OFDM signal over statistical models, specifically Rayleigh distributed, for frequency selective fading channels. In order to achieve this aim, we first derive the decision variables and the signal-tointerference noise ratios of the FFH/OFDM signal at the output of minimum mean square error and zero forcing receivers. For various levels of quadrature amplitude modulation used in FFH/OFDM, the performances are calculated and validated via simulations. The results show that FFH/OFDM in case of zero forcing equalization does not provide any diversity gain even over a frequency selective channel. However, in case of minimum mean square error equalization, it brings significant diversity gain at high signal-to-noise ratio (SNR) values with the rise of number of sub-carriers. Moreover, the FFH/OFDM with four quadrature amplitude modulation scheme provides better performance than that of the conventional OFDM even at low SNR values, as well as a significant diversity gain at high SNR values.

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A Novel Low-Complexity Precoded OFDM System With Reduced PAPR

Cited by 65 publications

References 22 publications

Experimental Investigation of Zadoff-Chu Matrix Precoding for Visible Light Communication System with OFDM Modulation

Experimental Investigation of Zadoff-Chu Matrix Precoding for Visible Light Communication System with OFDM Modulation

Semiblind Channel Estimation and Precoding Scheme in Two-Way Multirelay Networks

SINR analysis of FFH/OFDM over frequency selective Rayleigh fading channel

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