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frequency-domain equalization for Single-Carrier Space-Time Block Coded Transmit Diversity in a High Mobility Environment

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IEICE TRANSACTIONS ON COMMUNICATIONS 2016年第5期E99B卷 1180-1188页

作者： Miyazaki, Hiroyuki Adachi, Fumiyuki Tohoku Univ Grad Sch Engn Dept Commun Engn Sendai Miyagi 9808579 Japan

Single-carrier (SC) transmission with space-time block coded (STBC) transmit diversity can achieve good bit error rate (BER) performance. However, in a high mobility environment, the STBC codeword orthogonality is distorted and as consequence, the BER performance is degraded by the interference caused by the orthogonality distortion of STBC codeword. In this paper, we proposed a novel frequency-domain equalization (FDE) for SC-STBC transmit diversity in doubly selective fading channel. Multiple FDE weight matrices, each associated with a different code block, are jointly optimized based on the minimum mean square error (MMSE) criterion taking into account not only channel frequency variation but also channel time variation over the STBC codeword. Computer simulations confirm that the proposed robust FDE achieves BER performance superior to conventional FDE, which was designed based on the assumption of a quasi-static fading.

关键词： space-time block coding frequency-domain equalization doubly selective fading

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frequency-domain equalization for space-time block-coded systems

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2005年第6期4卷 2907-2916页

作者： Pancaldi, F Vitetta, GM Univ Modena Dept Informat Engn I-41100 Modena Italy

In this paper, conventional and turbo-channel-equalization algorithms processing two samples of the received signal per channel symbol and operating in the frequency domain are proposed for space-time block-coded systems. In the class of conventional equalization techniques, minimum-mean-square-error (MAISE) linear and decision-feedback equalizers (DFE) are derived and a synthesis technique based on the well-known Levinson-Durbin algorithm is proposed for the latter. Similarly, iterative linear and decision-feedback-equalization algorithms for turbo receivers are devised. Performance results show the efficacy of the proposed equalization techniques and their superiority over other frequency-domain-equalization strategies.

关键词： decision-feedback equalization frequency-domain equalization multipath channel space-time coding

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frequency-domain equalization for Broadband Single-Carrier Multiple Access

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IEICE TRANSACTIONS ON COMMUNICATIONS 2009年第5期E92B卷 1441-1456页

作者： Adachi, Fumiyuki Tomeba, Hiromichi Takeda, Kazuki Tohoku Univ Grad Sch Engn Dept Elect & Commun Engn Sendai Miyagi 9808579 Japan

Single-carrier (SC) multiple access is a promising uplink multiple access technique because of it low peak-to-average power ratio (PAPR) property and high frequency diversity gain that is achievable through simple one-tap frequency-domain equalization (FDE) in a strong frequency-selective channel. The multiple access capability call be obtained by combining either frequency division multiple access (FDMA) or code division multiple access (CDMA) with SC transmission. In this article, we review the recent research on the SC Multiple access techniques with one-tap FDE. After introducing the principle of joint FDE/antenna diversity combining, we review various SC Multiple access techniques with one-tap FDE, i.e., SC-FDMA, SC-CDMA, block spread CDMA, and delay-time/CDMA.

关键词： single-carrier frequency-domain equalization frequency-selective channel wireless systems

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frequency-domain equalization for distributed terrestrial DTV transmission environments

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IEEE TRANSACTIONS ON CONSUMER ELECTRONICS 2006年第1期52卷 59-67页

作者： Son, SW Kim, JH Lee, YS Kim, HN Park, SI Pusan Natl Univ Dept Elect Engn Pusan 609735 South Korea ETRI DTV Syst Res Team Taejon 305350 South Korea

The 8-VSB modulation, the transmission standard for the terrestrial digital television (DTV), of the Advanced Television Systems Committee (ATSC), suffers from multipath fading because it conveys information on the amplitude. To solve this Problem, decision feedback equalizers (DFEs) have been commonly used in the terrestrial DTV receivers. However, under severe channels, such as a 0-dB ghost channel or a distributed transmission environment, the DFEs have shown unstable convergence due to the error propagation caused by decision errors. Instead of unstable time-domain DFE schemes, by proposing a frequency-domain direct-inversion equalization method, we achieve stable equalization and low symbol error rates. To secure the existence of a channel inverse, channel-matched filtering and noncausal filtering are carried out before equalization. Simulation results show that the proposed method performs much better than the existing DFE schemes in terms of both the stability and the symbol error rates.

关键词： DTV channel equalization noncausal filter frequency-domain equalization

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frequency-domain equalization for OFDMA-based multiuser MIMO systems with improper modulation schemes

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EURASIP JOURNAL ON ADVANCES IN SIGNAL PROCESSING 2011年第1期2011卷 1-8页

作者： Xiao, Pei Lin, Zihuai Fagan, Anthony Cowan, Colin Vucetic, Branka Wu, Yi Univ Surrey Ctr Commun Syst Res Guildford GU2 7XH Surrey England Univ Sydney Sch Elect & Informat Engn Sydney NSW 2006 Australia Univ Coll Dublin Dept Elect & Elect Engn Dublin 4 Ireland Queens Univ Belfast Inst Elect Commun & Informat Technol Belfast BT3 9DT Antrim North Ireland Fujian Normal Univ Dept Commun & Network Engn Fuzhou 350007 Fujian Peoples R China

In this paper, we propose a novel transceiver structure for orthogonal frequency division multiple access-based uplink multiuser multiple-input multiple-output systems. The numerical results show that the proposed frequency-domain equalization schemes significantly outperform conventional linear minimum mean square error-based equalizers in terms of bit error rate performance with moderate increase in computational complexity.

关键词： OFDMA multiple-input multiple output (MIMO) frequency-domain equalization

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frequency-domain equalization of Faster-than-Nyquist Signaling

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IEEE WIRELESS COMMUNICATIONS LETTERS 2013年第5期2卷 555-558页

作者： Sugiura, Shinya Tokyo Univ Agr & Technol Dept Comp & Informat Sci Koganei Tokyo 1848588 Japan

In this letter, motivated by the recent rediscovery of faster-than-Nyquist (FTN) signaling transmissions, we conceive a frequency-domain equalization (FDE)-assisted FTN receiver architecture, which is capable of attaining a low demodulating complexity. The proposed scheme is especially beneficial for a long channel tap FTN scenario. More specifically, in our scheme the resultant inter-symbol interference imposed by FTN signaling is approximated by a finite-tap circulant matrix structure, which allows us to employ an efficient fast Fourier transform operation and a low-complexity channel-inverse-based minimum mean-square error detection algorithm. Our simulation results demonstrate that the proposed scheme is capable of attaining a near-optimal error-rate performance without imposing any substantial demodulating complexity as well as power penalty.

关键词： Cyclic prefix faster-than-Nyquist signaling fast Fourier transform frequency-domain equalization minimum mean-square error

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frequency-domain equalization with Iterative Block Noise-Prediction for Single-Carrier Systems

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IEICE TRANSACTIONS ON COMMUNICATIONS 2009年第8期E92B卷 2747-2750页

作者： Feng, Ang Yin, Qinye Xi An Jiao Tong Univ Sch Elect & Informat Engn Xian 710049 Peoples R China

In this letter, we propose a novel frequency-domain equalizer (FDE) for single-carrier systems characterized by severe inter-symbol interference (ISI) channels;it consists of a linear FDE and an iterative block noise-predictor (LBNP). Unlike the FDE with time-domain noise predictor (FDE-NP), the proposed scheme allows the feedback equalizer being an uncausal filter. and performs the noise prediction in an iterative manner. For this reason, FDE-IBNP can remove both precursor and postcursor ISI, and alleviate the impact of error-propagation. Besides, our scheme has lower computational complexity than the present iterative block equalizers.

关键词： single-carrier frequency-domain equalization iterative noise prediction decision-feedback equalization

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frequency-domain equalization for E-band Transmission System 6

Frequency-domain Equalization for E-band Transmission System

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6th International Conference on Computational Intelligence and Communication Networks

作者： Zeng, Jianming Zhou, Zhigang Lu, Jiaxin Chen, Shengji Chinese Acad Sci Shanghai Inst Microsyst & Informat Technol Shanghai 200050 Peoples R China

ISBN: (纸本)9781479969296

In the single carrier block transmission based on E-band transmission system, the cyclic prefix (CP) was removed to increase transmission efficiency. However, the received signal suffers from inter-symbol interference (ISI) and inter-block interference (IBI) introduced by multipath fading channel, which cannot be efficiently suppressed directly by frequency-domain equalization (FDE). In this paper, based on the analysis of IBI distribution in the symbol block, we proposed a novel frequency-domain equalization technique by extracting the central symbols from the equalized symbol block to avoid IBI. Computer simulation results show that the proposed scheme can achieve a good BER performance in the E-band transmission system and provides higher transmission efficiency than conventional FDE, although at the expense of increased system complexity.

关键词： E-band frequency-domain equalization overlap inter-block interference

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frequency-domain equalization for Single-Carrier SFBC Diversity in a frequency-Selective Fading 82

Frequency-Domain Equalization for Single-Carrier SFBC Divers...

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IEEE 82nd Vehicular Technology Conference (VTC Fall)

作者： Miyazaki, Hiroyuki Adachi, Fumiyuki Tohoku Univ Grad Sch Engn Dept Commun Engn Aoba Ku 6-6-05 Aza Aoba Sendai Miyagi 9808579 Japan

ISBN: (纸本)9781479980918

In a high mobility environment, single-carrier (SC) space-frequency block coding (SFBC) diversity achieves better bit error rate (BER) performance than SC space-time block coding (STBC) diversity. However, in a strong frequency-selective fading channel, the BER performance degrades due to the ortho-gonality distortion of SFBC codeword. In this paper, we propose a frequency-domain equalization (called robust FDE) suitable for SC-SFBC diversity in a frequency-selective fading. The robust FDE weights are jointly optimized based on minimum mean square error (MMSE) criterion taking into account channel variation within a SFBC codeword caused by frequency-selective fading. It is shown by computer simulation that proposed robust FDE always achieves BER performance superior to conventional FDE whose weights are determined without considering the channel frequency variation within a SFBC codeword.

关键词： component Space-frequency block coding frequency-domain equalization single-carrier transmission

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frequency-domain equalization Aided Iterative Detection of Faster-than-Nyquist Signaling with Noise Whitening

Frequency-Domain Equalization Aided Iterative Detection of F...

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IEEE International Conference on Communications (ICC)

作者： Ishihara, Takumi Sugiura, Shinya Tokyo Univ Agr & Technol Dept Comp & Informat Sci Koganei Tokyo 1848588 Japan

ISBN: (纸本)9781479966646

In this paper, we propose a serially concatenated turbo-encoded faster-than-Nyquist signaling (FTNS) transceiver that takes into account FTNS-specific colored noise effects. The proposed low-complexity receiver carries out soft-decision frequency-domain equalization with the aid of the minimum-mean square error criterion while whitening the colored noise. Simulation results demonstrate that the proposed multi-stage-concatenated FTNS system achieves a better error-ratio performance than previous systems that do not consider colored noise effects in the high-symbol-packing FTNS regime. Furthermore, as an explicit benefit of the proposed iterative decoder, near-capacity performance is achieved with practical decoding complexity.

关键词： Faster-than-Nyquist signaling frequency-domain equalization soft-output detection turbo coding colored noise minimum-mean square error

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