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single-carrier frequency-domain equalization Based on frequency-domain Oversampling

IEEE COMMUNICATIONS LETTERS 2012年第1期16卷 24-26页

作者： Zhang, Xiaohui Chen, Enqing Mu, Xiaomin Zhengzhou Univ Sch Informat Engn Zhengzhou Peoples R China

A technique based on the frequency-domain oversampling in single-carrier frequency-domain equalization is proposed. Simulation results show that the proposed system based on frequency domain oversampling outperforms t... 详细信息

关键词： single-carrier frequency-domain equalization frequency-domain oversampling frequency-selective channel channel estimation

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Cooperative Beamforming for single-carrier frequency-domain equalization Systems with Multiple Relays

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2012年第6期11卷 2276-2286页

作者： Wu, Peiran Schober, Robert Univ British Columbia Dept Elect & Comp Engn Vancouver BC V6T 1Z4 Canada

We consider cooperative beamforming (BF) for block-based single-carrier frequency-domain equalization (SC-FDE) in a wireless network consisting of one single-antenna source, one single-antenna destination, and multiple multi-antenna relays. Adopting the minimum mean squared error as optimality criterion, the optimal frequency-domain linear equalization (LE) and decision-feedback equalization (DFE) receivers are derived and corresponding objective functions for relay BF matrix optimization are specified. For a sum relay power constraint, we obtain the structure of the optimal relay BF matrices in closed form. While the structure of the optimal relay BF matrices is identical for LE and DFE as well as for an idealized matched filter receiver, the solution of the remaining power allocation problem depends on the adopted receiver. The power allocation problem is shown to be convex for all considered receivers and an efficient numerical algorithm for finding the optimal power allocation is provided. Furthermore, to reduce complexity, two suboptimal power allocation schemes assigning identical powers to all relays and/or frequencies are proposed and shown to lead to only a small loss in performance and a remarkable robustness against imperfect channel state information.

关键词： Multiple-relay networks cooperative beam-forming single-carrier frequency-domain equalization

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Reconfigurable Intelligent Surface-Aided single-carrier frequency-domain equalization

Reconfigurable Intelligent Surface-Aided Single-Carrier Freq...

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IEEE Conference on Global Communications (IEEE GLOBECOM) - Intelligent Communications for Shared Prosperity

作者： Li, Qiang Wen, Miaowen Huang, Yu Wen, Jinming Li, Jun Basar, Ertugrul Jinan Univ Coll Informat Sci & Technol Guangzhou 510632 Peoples R China South China Univ Technol Sch Elect & Informat Engn Guangzhou 510640 Peoples R China Guangzhou Univ Sch Elect & Commun Engn Guangzhou 510006 Peoples R China Koc Univ Dept Elect & Elect Engn TR-34450 Istanbul Turkiye

ISBN: (纸本)9798350310900

In this paper, we employ a reconfigurable intelligent surface (RIS) to boost the single-carrier frequency-domain equalization (SC-FDE) transmission for both single- and multi-antenna broadband wireless communications. Different from the existing RIS-SC-FDE schemes that use an RIS to harvest cyclic delay diversity with a limited beamforming gain, our advanced schemes unlock the potential of the RIS in passive beamforming to maximize the receive signal-to-noise ratio. Concerning the high complexity issue, a low-complexity minorization-maximization (MM) method, which leads to a closed-form solution in each iteration, is developed for the RIS beamforming optimization problem. Finally, simulation results show that the proposed RIS-SC-FDE with the MM-based beamforming significantly outperforms the existing counterparts in terms of bit error rate.

关键词： single-carrier frequency-domain equalization reconfigurable intelligent surface beamforming design minorization-maximization

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Prefiltered single-carrier frequency-domain equalization for Binary CPM over Shallow Water Acoustic Channel

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SENSORS 2022年第10期22卷 3821-3821页

作者： Han, Ruigang Jia, Ning Guo, Zhongyuan Huang, Jianchun Xiao, Dong Guo, Shengming Chinese Acad Sci Inst Acoust Beijing 100190 Peoples R China Chinese Acad Sci Key Lab Underwater Acoust Environm Beijing 100190 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

The continuous phase modulation (CPM) technique is an excellent solution for underwater acoustic (UWA) channels with limited bandwidth and high propagation attenuation. However, the severe intersymbol interference is a big problem for the algorithm applying in shallow water. To solve this problem, an algorithm for prefiltered single-carrier frequency-domain equalization (PF-SCFDE) is presented in this paper. The regular whitening filter is replaced by a prefilter in the proposed algorithm. The output information sequence of this prefilter contains the forward information. To improve the performance, the output of the equalizer, combined with the forward information, is used to make the maximum likelihood estimation. The simulation results with minimum-shift keying and Gaussian-filtered minimum-shift keying signals over shallow water acoustic channels with low root mean square delay spread demonstrate that PF-SCFDE outperformed the traditional single-carrier frequency-domain equalization (SCFDE) by approximately 1 dB under a bit error rate (BER) of 10(-4). A shallow sea trial has demonstrated the effectiveness of PF-SCFDE;PF-SCFDE had a reduction in BER of 18.35% as compared to the traditional SCFDE.

关键词： UWA communication binary continuous phase modulation single-carrier frequency-domain equalization prefilter

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Nonredundant precoding-assisted blind channel estimation for single-carrier space-time block-coded transmission with frequency-domain equalization

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2007年第3期55卷 1062-1080页

作者： Wu, Jwo-Yuh Lee, Ta-Sung Natl Chiao Tung Univ Dept Commun Engn Hsinchu 300 Taiwan

Relying on nonredundant diagonal precoding and independent and identically distributed (i.i.d.) source assumption, this paper proposes a blind channel estimation scheme for single-carrier frequency-domain equalization-based space-time block coded systems. The proposed method exploits the precoding-induced linear signal structure in the conjugate cross correlation between the two temporal block received signals as well as the circulant channel matrix property and can yield exact solutions whenever the channel noise is circularly Gaussian and the receive data statistic is perfectly obtained. The channel estimation formulation builds on rearranging the set of linear equations relating the entries of conjugate cross-correlation matrix and products of channel impulse responses into one with a distinctive block-circulant with circulant-block (BCCB) structure. This allows a simple identiliability condition depending on precoder parameters alone and also provides a natural yet effective optimal precoder design framework for improving solution accuracy when imperfect data estimation occurs. We consider two models of data mismatch, from both deterministic and statistical points of view, and propose the associated design criteria. The optimization problems are formulated to take advantage of the BCCB system matrix property and are solved analytically. The proposed, optimal precoder aims to optimize solution robustness against deterministic error perturbation and also minimize the mean-square error when the data mismatch is modeled as a white noise. Pairwise error probability analysis is conducted for investigating the equalization performance. Numerical examples are used to illustrate the performance of the proposed method.

关键词： blind channel estimation block-circulant matrix with circulant blocks (BCCB) circulant matrix multiple input single output (MISO) nonredundant precoders single-carrier frequency-domain equalization space-time block code (STBC) transmit diversity

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frequency-domain Turbo equalization with Iterative Impulsive Noise Mitigation for single-carrier Power-Line Communications

Frequency-Domain Turbo Equalization with Iterative Impulsive...

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International Conference on Wireless Communications, Networking and Applications (WCNA)

作者： Liu, Ying Guo, Qinghua Tong, Sheng Tong, Jun Xi, Jiangtao Yu, Yanguang Univ Wollongong Northfields Ave Wollongong NSW 2522 Australia

ISBN: (纸本)9788132225805;9788132225799

Power-line communication (PLC) has been recognized as a promising alternative communication technology due to the universal existence of power lines. However, signal transmitted through PLC channel suffers from severe inter-symbol interference (ISI) and strong impulsive noise (IN), degrading the reliability of data transmission. Although multicarrier orthogonal frequency-division multiplexing (OFDM) has been investigated to combat ISI in PLC, the inherent large peak-to-average power ratio (PAPR) of OFDM signal makes IN detection very difficult, and the OFDM based PLC system may not be the best choice under hostile PLC channels. To combat both ISI and IN, we propose a low complexity scheme based on single-carrier frequency-domain turbo equalization (SC-FDTE) coupled with iterative IN mitigation. Simulation results indicate that, the proposed scheme is able to efficiently mitigate IN in the PLC channel and outperforms the joint clipping and blanking approach for IN mitigation.

关键词： Iterative impulsive noise mitigation single-carrier frequency-domain equalization Turbo equalization Power-line communications Impulsive noise

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Low-Complexity Iterative frequency domain Decision Feedback equalization

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2011年第3期60卷 1295-+页

作者： Zhang, Chao Wang, Zhaocheng Pan, Changyong Chen, Sheng Hanzo, Lajos Tsinghua Univ Dept Elect Engn Tsinghua Natl Lab Informat Sci & Technol State Key Lab Microwave & Digital Commun Beijing 100084 Peoples R China Univ Southampton Sch Elect & Comp Sci Southampton SO17 1BJ Hants England

single-carrier transmission with frequency-domain equalization (SC-FDE) offers a viable design alternative to the classic orthogonal frequency-division multiplexing (OFDM) technique. However, SC-FDE using a linear equalizer may suffer from serious performance deterioration for transmission over severely frequency-selective fading channels. An effective method of solving this problem is to introduce nonlinear decision feedback equalization (DFE) to SC-FDE. In this paper, a low-complexity iterative DFE operating in the frequency domain of single-carrier systems is proposed. Based on the minimum-mean-square-error (MMSE) criterion, a simplified parameter estimation method is introduced to calculate the coefficients of the feedforward and feedback filters, which significantly reduces the implementation complexity of the equalizer. Simulation results show that the performance of the proposed simplified design is similar to the traditional iterative block DFE under various multipath fading channels, but it imposes a much lower complexity than the latter.

关键词： Decision feedback equalizer (DFE) iterative block DFE (IBDFE) minimum mean square error (MMSE) single-carrier frequency-domain equalization

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frequency-domain Iterative Block DFE Using Erasure Zones and Improved Parameter Estimation

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IEICE TRANSACTIONS ON COMMUNICATIONS 2021年第9期E104B卷 1159-1171页

作者： Pan, Jian-Yu Lai, Kuei-Chiang Li, Yi-Ting Su, Szu-Lin Tainan City Police Dept Tainan Taiwan Natl Cheng Kung Univ Dept Elect Engn Tainan Taiwan HTC Corp New Taipei Taiwan

Iterative block decision feedback equalization with harddecision feedback (HD-IBDFE) was proposed for single-carrier transmission with frequency-domain equalization (SC-FDE). The detection performance hinges upon not only error propagation, but also the accuracy of estimating the parameters used to re-compute the equalizer coefficients at each iteration. In this paper, we use the erasure zone (EZ) to de-emphasize the feedback values when the hard decisions are not reliable. EZ use also enables a more accurate, and yet computationally more efficient, parameter estimation method than HD-IBDFE. We show that the resulting equalizer coefficients share the same mathematical form as that of the HD-IBDFE, thereby preserving the merit of not requiring matrix inverse operations in calculating the equalizer coefficients. Simulations show that, by using the EZ and the proposed parameter estimation method, a significant performance improvement over the conventional HD-IBDFE can be achieved, but with lower complexity.

关键词： single-carrier frequency-domain equalization decision feedback equalization inter-symbol interference erasure parameter estimation

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frequency-domain equalization for Orthogonal and Quasi-Orthogonal STBCs over frequency-Selective Wireless and Power-Line Channels

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WIRELESS PERSONAL COMMUNICATIONS 2013年第4期71卷 2445-2461页

作者： Sheikh-Hosseini, Mohsen Molavi-Kakhki, Mohammad Hodtani, Ghosheh Abed Ferdowsi Univ Mashhad Dept Elect Engn Program Commun Engn Mashhad Iran Ferdowsi Univ Mashhad Dept Elect Engn Mashhad Iran

In recent years, combination of single-carrier frequency-domain equalization (SC-FDE) and space-time block coding/code (STBC) techniques to exploit the advantages of both, has received a great attention. In this paper we propose new techniques for combining SC-FDE with orthogonal and Quasi-orthogonal STBCs applicable to any number of transmit antennas. For Quasi-orthogonal STBC we first propose a new structure for codes with four transmit antennas and then extend it to higher numbers. We convert Quasi-orthogonal system to two equivalent orthogonal subsystems and equalize and decode these subsystems based on our proposed procedure for orthogonal codes. Finally, we present our simulation results for different frequency-selective wireless and power-line channels and show that a significant SNR gain is achieved when SC-FDE is combined with diversity techniques.

关键词： frequency-selective fading channels Power line communication Space-time block coding single-carrier frequency-domain equalization

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A frequency-domain equalization architecture for space-time block coded MIMO-CDMA systems

A frequency-domain equalization architecture for space-time ...

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66th IEEE Vehicular Technology Conference

作者： Ruan, Zhifeng Wang, Qixing Li, Baojin Chang, Yongyu Yang, Dacheng Beijing Univ Posts & Telecommun Wireless Theories & Technol Lab Beijing 100876 Peoples R China

ISBN: (纸本)9781424402632

In this paper, a frequency-domain equalization architecture for the downlink over a space-time block coded MIMO-CDMA system is proposed. This architecture exploits transmit diversity by equally dividing the N-T (NT = 2Q, Q is a positive integer) transmit antennas into Q groups and implementing an Alamouti-like space-time block coding scheme for each group. At the receiver, the single-carrier minimum-mean-square-error frequency-domain equalization is combined with the successive interference cancellation to combat various interferences resulting from frequency-selective fading channels under multi-antenna and multi-user conditions. It is shown that our proposed architecture significantly outperforms the conventional MIMO-CDMA structures.

关键词： space-time block coded transmission MIMO-CDMA single-carrier frequency-domain equalization successive interference cancellation

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