Frequency-domain precoding for single carrier frequency-division multiple access

Noune, MB; Nix, Andrew R

doi:10.1109/mcom.2009.5116802

Cited by 50 publications

(20 citation statements)

References 11 publications

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“…In [16], we have proposed a frequency-domain implementation of the THP filter by removing the modulo device and converting the timedomain cyclical convolution between the transmitted signal and the THP filter into a point-by-point multiplication in the frequency-domain; If the precoder's input is the SC-FDMA modulated signal, x after CP insertion, then by ignoring the first P samples the precoder's output y n can be related to the precoder's input x, expressed as y = B x, where B is a circulant matrix. The precoder's output is therefore…”

Section: ∂J Thp-fde ∂Bmentioning

confidence: 99%

Joint Tomlinson-Harashima Precoding and Optimum Transmit Power Allocation for SC-FDMA

Noune

Nix

2010

2010 IEEE Wireless Communication and Networking Conference

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Abstract-Single-Carrier Frequency Division Multiple Access (SC-FDMA) has been selected as the uplink transmission scheme in the 3GPP Long Term Evolution standard. SC-FDMA has reduced sensitivity to phase noise and a lower Peak-to-Average Power Ratio (PAPR) compared to Orthogonal Frequency Division Multiple Access. In this paper we propose joint TomlinsonHarashima Precoding and transmit power allocation for SC-FDMA. We derive the optimum power allocation for SC-FDMA transmission for both Zero-Forcing (ZF) and Minimum MeanSquare Error (MMSE) LE receivers in order to maximize the achievable data rate subject to constant transmit power. Although this improves the system's performance and offers a 1-2 dB improvement over Frequency-Domain Decision Feedback Equalization (FD-DFE), when the proposed transmit power allocation scheme is combined with decision feedback equalization the system incurs a performance degradation due to error propagation. In this paper we propose a joint implementation of the derived power allocation scheme with THP. Here we show that the system's performance is further improved over both FD-LE and FD-DFE when transmit power allocation is applied.

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Section: ∂J Thp-fde ∂Bmentioning

confidence: 99%

Joint Tomlinson-Harashima Precoding and Optimum Transmit Power Allocation for SC-FDMA

Noune

Nix

2010

2010 IEEE Wireless Communication and Networking Conference

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“…As a downside, Tomlinson-Harashima precoding requires full channel state information (CSI) at the transmitter, which may be hard to obtain precisely in wireless systems. SC-FDE systems using TomlinsonHarashima precoding were proposed in [7,8].…”

Section: Introductionmentioning

confidence: 99%

Widely linear MMSE precoding and equalization techniques for SC-FDE systems

Chang

Rocha

Ruyet

et al. 2014

EURASIP J. Adv. Signal Process.

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Single-carrier systems using frequency-domain equalization (SC-FDE) systems were proposed to overcome the low robustness to carrier frequency offset (CFO) and high peak-to-average-power ratio (PAPR) inherent to regular orthogonal frequency-division multiplexing (OFDM) systems. Usually, linear minimum mean square error (MMSE) equalization is used to compensate the channel effect, since maximum likelihood (ML) detection is computationally impractical. However, if the transmitted signal comes from an improper constellation, widely linear processing can be used to take advantage of all the available second-order statistics from this transmitted signal, obtaining this way a performance gain when compared to the strictly linear case. In this paper, a SC-FDE system employing widely linear MMSE equalization is proposed in its regular and decision-feedback (DFE) versions. A SC-FDE system employing widely linear MMSE Tomlinson-Harashima precoding (THP) and equalization is also proposed. With Tomlinson-Harashima precoding, the error propagation problem observed in systems using a decision-feedback equalizer vanishes, because the feedback processing is done at the transmitter. Simulation results show that together with the error performance gain, these systems have lower sensibility to the feedback filter length in systems using decision-feedback equalizers. In Tomlinson-Harashima precoded systems, the performance gain is observed even with channel estimation/channel state information errors.

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“…In OFDMA system, the entire channel is divided into many narrow sub channels, which are transmitted in parallel, thereby increasing the symbol duration and reducing the inter-symbol-interference (ISI). OFDMA is highly suitable for broadband wireless access networks (particularly the downlink) since it combines scalability, multipath robustness, and multiple-input multiple-output (MIMO) compatibility [2]. OFDMA is sensitive to frequency offset and phase noise, and thus requires accurate frequency and phase synchronization.…”

Section: Introductionmentioning

confidence: 99%

SC-FDMA based systems to Reduce PAPR by using a Modified Companding Scheme

Singh¹,

Pardeep²,

Prasad³

2014

IJCA

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The 3rd generation partnership project (3GPP) long term evolution (LTE) standard uses single carrier frequency division multiple access (SCFDMA), scheme for the uplink transmissions and orthogonal frequency division multiplexing access (OFDMA) in downlink. SCFDMA makes use of single carrier modulation and frequency domain equalization, it is a technique that has similar performance and essentially the same overall complexity as those of OFDM, But in OFDMA high peak-to-average power ratio (PAPR) is a major drawback. An outstanding advantage of SC-FDMA is its lower PAPR due to its single carrier structure. In this paper, we analyze the PAPR of SC-FDMA signals with pulse shaping. We analytically derive the time domain SC-FDMA signals and numerically compare PAPR characteristics using the complementary cumulative distribution function (CCDF) of PAPR. The results show that SC-FDMA signals indeed have lower PAPR compared to those of OFDMA. Comparing the two forms of SC-FDMA, we find that localized FDMA (LFDMA) has higher PAPR than interleaved FDMA (IFDMA) but somewhat lower PAPR than OFDMA. Also noticeable is the fact that pulse shaping increases PAPR. To reduce the PAPR, we propose an efficient Kalman filter based PAPR reduction algorithm.

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Frequency-domain precoding for single carrier frequency-division multiple access

Cited by 50 publications

References 11 publications

Joint Tomlinson-Harashima Precoding and Optimum Transmit Power Allocation for SC-FDMA

Joint Tomlinson-Harashima Precoding and Optimum Transmit Power Allocation for SC-FDMA

Widely linear MMSE precoding and equalization techniques for SC-FDE systems

SC-FDMA based systems to Reduce PAPR by using a Modified Companding Scheme

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