Single-carrier frequency domain equalization

Pancaldi, Fabrizio; Vitetta, G.M.; Kalbasi, Reza; Al-Dhahir, Naofal; Uysal, Murat; Mheidat, H.

doi:10.1109/msp.2008.926657

Cited by 319 publications

(172 citation statements)

References 43 publications

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“…The problem in the channel with deep null is that it requires relatively long equalizer tap coefficients. Frequency domain equalizer [1,2] is a good candidate since it works well even when the channel has deep nulls, even though it still suffers from the noise enhancement. In this sense, decision feedback equalizers (DFE) [3][4][5] can be considered to combat the channels with deep null since it not only can mitigate the noise enhancement, but also can reduce the equalizer length by utilizing the feedback filters which is effectively an IIR filter.…”

Section: Introductionmentioning

confidence: 99%

“…Based on this observations, we, in this paper, consider to use turbo equalization techniques using the decision feedback equalizer in time-domain [2,3] and in frequency domain [10,11] by replacing the immediate hard-decision with the soft-decisions fed-back from channel decoder. Using log-likelihood ratio (LLR) feedback from channel decoder, we extract the soft decision as a posteriori mean and the reliability information as a posteriori variance, which are then used to cancel the residual interference.…”

Section: Introductionmentioning

confidence: 99%

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Performance of Iterative Soft Decision Feedback Equalizers for Single-Carrier Transmission

Jeon¹,

Yoon²

2017

Journal of Electrical Engineering and Technology

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-In this paper, we consider iterative soft-decision feedback equalizers (sDFE), a.k.a. turbo equalizers for single-carrier transmission. Turbo equalizer takes log-likelihood ratio (LLR) feedback from channel decoder and convert the LLR into symbol estimates and variances to be used for the LLR update at the sDFE. Specifically, we consider both time domain and frequency-domain sDFE and compare their performances. The results shows that frequency-domain sDFE performs better than time-domain one and also that considerable gain can be obtained especially when the channel has deep nulls.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance of Iterative Soft Decision Feedback Equalizers for Single-Carrier Transmission

Jeon¹,

Yoon²

2017

Journal of Electrical Engineering and Technology

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“…Even though the OFDM presents clear advantages regarding the implementation aspect, since the received signal is free from intersymbol interference (ISI), if we assume that no channel information is known at the transmitter side, the OFDM highly depends on the coding scheme to properly exploit the frequency domain diversity [4], [5]. In contrast, the SCCP can be an interesting alternative to OFDM, since it naturally exploit the channel frequency diversity spreading the information throughout the used spectrum.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, the SCCP can be an interesting alternative to OFDM, since it naturally exploit the channel frequency diversity spreading the information throughout the used spectrum. Several papers compare these two transmission schemes regarding the biterror rate (BER) performance [1], [2], [4], [6]. Most of them are limited to quadrature phase-shift keying (QPSK) modulations, with a few exceptions that use M-ary quadrature amplitude modulation (QAM).…”

Section: Introductionmentioning

confidence: 99%

An uncoded BER comparison between DFE-SCCP and OFDM using a convex analysis framework

Paula

Panazio

2011

2011 IEEE International Symposium of Circuits and Systems (ISCAS)

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Abstract-This article aims to establish a theoretical performance comparison between the Single Carrier with Cyclic Prefix (SCCP) equalized with a Decision Feedback Equalizer (DFE) and the Orthogonal Frequency Division Multiplexing (OFDM) systems. We consider an uncoded scenario and we derive analytical relations between these systems's bit error rate (BER). The comparison is accomplished for different modulation schemes.

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“…These equalizers are required to produce instantaneous decisions. When incorrect decisions are made, DFEs behave poorly due to error propagation [6], particularly for coded modulation.…”

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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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Single-carrier frequency domain equalization

Cited by 319 publications

References 43 publications

Performance of Iterative Soft Decision Feedback Equalizers for Single-Carrier Transmission

Performance of Iterative Soft Decision Feedback Equalizers for Single-Carrier Transmission

An uncoded BER comparison between DFE-SCCP and OFDM using a convex analysis framework

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

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