Showing papers on "SC-FDE published in 2014"
TL;DR: A novel hybrid time-frequency adaptive equalization algorithm based on a combination of frequency domain equalization (FDE) and decision-directed least mean square (DD-LMS) is proposed and experimentally demonstrated in a Nyquist single carrier visible light communication (VLC) system.
Abstract: In this paper, a novel hybrid time-frequency adaptive equalization algorithm based on a combination of frequency domain equalization (FDE) and decision-directed least mean square (DD-LMS) is proposed and experimentally demonstrated in a Nyquist single carrier visible light communication (VLC) system. Adopting this scheme, as well with 512-ary quadrature amplitude modulation (512-QAM) and wavelength multiplexing division (WDM), an aggregate data rate of 4.22-Gb/s is successfully achieved employing a single commercially available red-green-blue (RGB) light emitting diode (LED) with low bandwidth. The measured Q-factors for 3 wavelength channels are all above the Q-limit. To the best of our knowledge, this is the highest data rate ever achieved by employing a commercially available RGB-LED.
94 citations
TL;DR: In this article, single-carrier frequency-domain equalization (SC-FDE) is evaluated using data collected during the 2009 Cooperative Array Performance Experiment (CAPEx09) that took place near Seattle, WA, USA.
Abstract: Single-carrier frequency-domain equalization (SC-FDE) is a promising technique for coherent underwater acoustic communications. The method has a lower peak-to-average power ratio than orthogonal frequency-division multiplexing (OFDM) and is more resistant to frequency offset. In this work, SC-FDE performance is evaluated using data collected during the 2009 Cooperative Array Performance Experiment (CAPEx09) that took place near Seattle, WA, USA. CAPEx09 had two densely populated vertical receiving arrays and a highly refractive environment, features that make it suitable for examining issues related to sensor positioning in range and depth. Two-channel equalization results show only a weak dependence on the spacing between the two sensors. Communications performance is interpreted in terms of relevant propagation physics, including acoustic ducting and rough surface scattering. The implications for undersea acoustic networks are discussed.
30 citations
TL;DR: A modified IB-DFE is proposed which incorporates knowledge of the channel estimation error model and its performance becomes more robust against the presence of strong error components in the channel estimates.
Abstract: Single carrier transmissions with frequency domain equalization (SC-FDE) have gained widespread use in emergent broadband wireless systems becoming an attractive alternative to popular Orthogonal Frequency Division Multiplexing (OFDM) schemes, particularly at the uplink. Since coherent receivers are usually employed with SC-FDE, accurate channel estimates are required so as to avoid substantial performance degradation. Several channel estimation strategies have been proposed for SC-FDE, but a thoroughly evaluation of the degradation caused by channel estimation errors and a comparison against OFDM is still lacking. In this paper we study the impact of imperfect channel knowledge on SC transmission with focus on the linear frequency domain equalizer (FDE) and on the Iterative Block Decision Feedback Equalizer (IB-DFE). We propose a modified IB-DFE which incorporates knowledge of the channel estimation error model and show that its performance becomes more robust against the presence of strong error components in the channel estimates. We also evaluate, analytically and through simulations, the degradation caused by imperfect channel estimation in SC-FDE and compare it against OFDM schemes (Orthogonal Frequency Division Multiplexing). It is shown that the channel estimation requirements for SC-FDE are higher than for OFDM unless a channel estimation error aware receiver is employed.
27 citations
06 Oct 2014
TL;DR: This paper proposes a novel CP selection technique that conceals the cyclic features of the signal while maintaining the advantages in equalization without reducing spectral efficiency.
Abstract: Cyclic prefix (CP) utilizing techniques such as orthogonal frequency division multiplexing (OFDM) and single carrier frequency domain equalization (SC-FDE) offer significant advantages in equalizing the effect of time dispersive channels at the expense of a reasonable spectral redundancy. However, cyclic features introduced by CP to the signal can also be exploited for blind parameter estimation and synchronization which compromise the security and privacy of the signal against eavesdropping attacks. In this paper, we propose a novel CP selection technique that conceals the cyclic features of the signal while maintaining the advantages in equalization without reducing spectral efficiency. After presenting the proposed technique, its performance is discussed for OFDM and SCFDE in terms of bit-error rate and complexity as well as cyclic feature suppression.
21 citations
TL;DR: Simulation results show that together with the error performance gain, these SC-FDE systems have lower sensibility to the feedback filter length in systems using decision-feedback equalizers, and in Tomlinson-Harashima precoded systems, the performance gain is observed even with channel estimation/channel state information errors.
Abstract: 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.
14 citations
TL;DR: This work presents a blind fine synchronization scheme, which estimates and compensates residual carrier-frequency offset (RCFO) and symbol timing offset (STO) , for single-carrier frequency-domain equalization (SC-FDE) systems and is more effective than existing techniques, in terms of both performance and throughput.
Abstract: This work presents a blind fine synchronization scheme, which estimates and compensates residual carrier-frequency offset (RCFO) and symbol timing offset (STO) , for single-carrier frequency-domain equalization (SC-FDE) systems. Existing fine synchronization schemes for SC-FDE systems rely on time-domain unique words (UW) sequences as reference signals to assure the estimation accuracy, at the cost of decreased system throughput. The proposed technique, named simplified weighted least-square method for single-carrier systems (SWLS-SC), combines the decision feedback structure and SWLS estimator for OFDM systems. Together with specifically derived weighting factors, it has much better estimation accuracy than the well-known linear least-square (LLS) method for SC-FDE systems, and its BER performance can approach that of the ideal synchronization condition. The proposed technique is more effective than existing techniques, in terms of both performance and throughput. Theoretical estimation bounds are also derived to verify the effectiveness of the proposed method.
14 citations
Patent•
17 Dec 2014
9 citations
TL;DR: This paper proposes an efficient method for estimating the channel frequency response and CFO associated to each transmitter and proposes receiver structures able to compensate the equivalent channel variations due to different CFO for different transmitters.
Abstract: Single carrier frequency-domain equalization (SC-FDE) modulations are known to be suitable for broadband wireless communications due to their robustness against severe time-dispersion effects and the relatively low envelope fluctuations of the transmitted signals. In this paper, we consider the use of SC-FDE schemes in broadcasting systems. A single frequency network transmission is assumed, and we study the impact of distinct carrier frequency offset (CFO) between the local oscillator at each transmitter and the local oscillator at the receiver. We propose an efficient method for estimating the channel frequency response and CFO associated to each transmitter and propose receiver structures able to compensate the equivalent channel variations due to different CFO for different transmitters. Our performance results show that we can have excellent performance, even when transmitters have substantially different frequency offsets.
7 citations
01 Oct 2014
TL;DR: PAPR and BER performances when using the proposed TD-SLM are evaluated by computer simulation and are compared to conventional joint Tx/Rx SC-FDE and joint TX/RX SC-fDE with FD-SLm.
Abstract: Transmit filtering, transmit equalization, precoding, or power allocation increases the peak-to-average power ratio (PAPR) of transmit single-carrier (SC) signal due to change in frequency-domain spectrum. Recently, we proposed a frequency-domain based selected mapping (FD-SLM) for suppressing the increased PAPR introduced by the transmit frequency-domain equalization (Tx-FDE). However, FD-SLM provides minor contribution when computational complexity is considered. In this paper, we are motivated by the fact that a “bad” arrangement of modulated symbols in a transmission block leads to high peak power, and propose a time-domain phase rotation called time-domain SLM (TD-SLM). PAPR and BER performances when using the proposed TD-SLM are evaluated by computer simulation and are compared to conventional joint Tx/Rx SC-FDE and joint Tx/Rx SC-FDE with FD-SLM.
6 citations
10 Jun 2014
TL;DR: To further improve the performance of the FDPMT, an optimal PPS technique is proposed based on the minimization of the average bit error rate (BER) and exhibits better performance with similar complexity.
Abstract: In this paper, we investigate the pilot position selection (PPS) problem in the frequency domain pilot multiplexing technique (FDPMT) for channel estimation of single-carrier block transmission with frequency domain equalization (SC-FDE). Unlike the widely accepted point of view that the conventional PPS technique is the optimal one, this paper for the first time questions this viewpoint and demonstrates the suboptimal property of the conventional PPS technique. To further improve the performance of the FDPMT, an optimal PPS technique is proposed based on the minimization of the average bit error rate (BER). Compared with the conventioanl PPS technique, the proposed PPS technique exhibits better performance with similar complexity.
6 citations
01 Sep 2014
TL;DR: The simulations show that non-ideal turbo-coded OFDM has better performance with greater diversity than non-Ideal Turbo-coded SC-FDE system in HF channel.
Abstract: The purpose of this paper is to compare the turbo-coded Orthogonal Frequency Division Multiplexing (OFDM) and turbo-coded Single Carrier Frequency Domain Equalization (SC-FDE) systems under the effects of Carrier Frequency Offset (CFO), Symbol Timing Offset (STO) and phase noise in wide-band Vogler-Hoffmeyer HF channel model. In mobile communication systems multipath propagation occurs. Therefore channel estimation and equalization is additionally necessary. Furthermore a nonideal local oscillator generally is misaligned with the operating frequency at the receiver. This causes carrier frequency offset. Hence in coded SC-FDE and coded OFDM systems; a very efficient, low complex frequency domain channel estimation and equalization is implemented in this paper. Also Cyclic Prefix (CP) based synchronization synchronizes the clock and carrier frequency offset. The simulations show that non-ideal turbo-coded OFDM has better performance with greater diversity than non-ideal turbo-coded SC-FDE system in HF channel.
04 Dec 2014
TL;DR: Simulation results show a net power efficiency enhancement, particularly for systems with channel coding, confirming MM as a major asset for high performance communication systems.
Abstract: Polyphase magnitude modulation (MM) has been shown to be a robust and effortless mean to improve the efficiency of a transmitter's high power amplifier (HPA), due to the real-time reduction of the peak to average power ratio (PAPR). MM's technique flexibility allows us to include the MM system on any existing single-carrier (SC) based transmission system with clear benefits on the achieved bit error rate \emph{vs} overall signal power to noise ratio. This paper analyzes the efficiency of MM when added to a multi- input multi-output (MIMO) system, using a block-based SC transmission combined with iterative block decision feedback equalization (IB-DFE). To improve the IB-DFE performance for low power signals, we consider an additional scheme where low-density parity-check (LDPC) coding and turbo equalization are added. Simulation results show a net power efficiency enhancement, particularly for systems with channel coding, confirming MM as a major asset for high performance communication systems.
TL;DR: In this paper, a novel SC-FDE transmission scheme with length-adaptive CP is proposed, and the delay spread parameters are estimated by a low-complexity algorithm for adaptively adjusting the length of CP.
Abstract: To combat inter-symbol interference caused by multipath channels, single carrier frequency-domain equalization (SC-FDE) transmission adds cyclic prefix (CP) to the head of transmitted data. Nevertheless, the overhead of CP leads to drawback for high transmission efficiency in varying mutipath channels. To address this issue, a novel SC-FDE transmission scheme with length-adaptive CP is proposed in this paper. In the proposed scheme, the delay spread parameters are estimated by a low-complexity algorithm for adaptively adjusting the length of CP. Simulation results demonstrate that the proposed algorithm can obtain accurate delay spread estimate and determine appropriate CP length for transmission over multipath radio channels.
01 Oct 2014
TL;DR: By computer simulation, it is shown that analog SC-SSB-FDE achieves better normalized mean square error (NMSE) performance than conventional analog SSB transmission and keeps the performance quality similar to analogSC-DSB-fDE.
Abstract: In order to improve performance of analog signal transmission, we recently proposed a novel analog single-carrier transmission with frequency-domain equalization (analog SC-FDE). Analog SC-FDE adopts double sideband (DSB) technique (referred to as analog SC-DSB-FDE) to transmit signal. In this paper, in order to double the spectrum efficiency of analog SC-DSB-FDE, single sideband (SSB) technique is introduced. Analog SC-SSB-FDE applies discrete Fourier transform (DFT), frequency-domain spectrum shaping filter and mapping, inverse DFT (IDFT), and cyclic prefix (CP) insertion before transmission. At the receiver, one-tap FDE is applied to take advantage of frequency diversity and a spectrum copy for restoring spectrum is applied. By computer simulation, we show that analog SC-SSB-FDE achieves better normalized mean square error (NMSE) performance than conventional analog SSB transmission and keeps the performance quality similar to analog SC-DSB-FDE.
Journal Article•
01 Nov 2014
TL;DR: Various equalization algorithms are proposed with the aim of exploiting the prefix redundancy for data detection and channel estimation based on the linear minimum mean square error (LMMSE) principle.
Abstract: In communication systems, the transmitted signals often experience various forms of corruption, and a very destructive one is the inter-symbol interference (ISI), resulting from the signals travelling through multiple paths and arriving with different delays. To compensate for the multipath propagation effect, equalization is often required at the receiver and as a very powerful candidate, the turbo equalization technique iteratively exchanges soft information between the equalizer and the decoder, offering excellent performance. Meantime, single-carrier frequency domain equalization (SC-FDE) and orthogonal frequency division multiplexing (OFDM) have become two of the most important modulation schemes in communications. Both schemes are based on guard interval assisted block transmissions and both can be implemented by fast Fourier transform/inverse fast Fourier transform (FFT/IFFT) operations, featuring very low complexity. Cyclic prefix (CP), as a commonly used guard interval, is typically discarded at the receiver. However, the fact that it is a repetition of part of the data suggests that it contains useful information and can be exploited for enhancing the system performance. This thesis considers the application of turbo equalization in SC-FDE and OFDM systems and based on the linear minimum mean square error (LMMSE) principle, various equalization algorithms are proposed with the aim of exploiting the prefix redundancy for data detection and channel estimation. To facilitate the description
15 May 2014
TL;DR: This paper presents a new efficient key technology for space telemetry wireless data link: the low-complexity serially concatenated continuous phase modulation single carrier frequency domain equalization (SC-FDE) algorithm, which combines serial concatenation convolutional coding (SCCC) technology with Continuous phase modulation (CPM) technology, thus to effectively eliminate inter-symbol interference (ISI) and inter-channel interference (ICI).
Abstract: The technology for space telemetry wireless data link is a kind of key enabling technology in high-rate wireless special communication, whose performance directly affects the information transfer efficiency of the whole system. How to improve the space telemetry wireless data link technology, so as to increase the efficiency and reliability for data transmission, as well as to lower bit error rate (BER) has become a hot topic in the field of high-rate wireless special communication. Since the conventional methods have a relatively high computational complexity and a relatively low power and spectrum efficiency, in this paper, we present a new efficient key technology for space telemetry wireless data link: the low-complexity serially concatenated continuous phase modulation (SC-CPM) single carrier frequency domain equalization (SC-FDE) algorithm, which combines serial concatenated convolutional coding (SCCC) technology with continuous phase modulation (CPM) technology, thus to effectively eliminate inter-symbol interference (ISI) and inter-channel interference (ICI), and to achieve a more excellent performance than Turbo codes. What's more, the pilot frequency training word sequence is embedded in each data packet for rapid and accurate evaluation of the channel information parameters, and M-ary Laurent decomposition method is introduced for low complexity minimum mean square error (MMSE) frequency domain equalization (FDE). Simulation experiment results demonstrate that our method has a better robustness, bandwidth efficiency and data link performance than the conventional methods. Furthermore, the low-complexity SC-CPM SC-FDE algorithm also has an important guiding significance for researches on high-rate wireless special communication under the condition of dynamic and multipath.
04 May 2014
TL;DR: Results show that it is possible to turn off femtocells and still satisfy the user's requirements, with significant energy saving, and to dynamically adjust the network deployment and reduce the network total energy consumption.
Abstract: Femtocells were proposed as a solution to improve the performance in dense networks. They complement the macro base stations (eNB) with a dense set of low power micro base stations (HeNB). However, they also bring increased interference problems and consequently more collisions and lost packets. This paper considers the use of femtocells running the Single Carrier with Frequency Domain Equalization (SC-FDE) transmission technique. It evaluates the performance of an Iterative Block Decision-Feedback Equalizer (IB-DFE) receiver employing Interference Cancellation (IC) techniques in the downlink channel. Using the interference cancellation capability, it is possible to dynamically adjust the network deployment and reduce the network total energy consumption. This paper also proposes a HeNB control algorithm and evaluates the energy saving capabilities of the reception technique for different load levels. Results show that it is possible to turn off femtocells and still satisfy the user's requirements, with significant energy saving.
TL;DR: The rate-optimal transceiver design for a hybrid single-carrier frequency-domain equalization and orthogonal frequency-division multiplexing decode-and-forward (DF) multiple-input-multiple-output (MIMO) relay system is considered.
Abstract: In this paper, we consider the rate-optimal transceiver design for a hybrid single-carrier frequency-domain equalization and orthogonal frequency-division multiplexing decode-and-forward (DF) multiple-input–multiple-output (MIMO) relay system. Such hybrid systems can provide a high end-to-end bit rate and a low peak-to-average power ratio at one of the transmitting nodes. Assuming minimum mean-squared-error equalization at the receiving nodes, we optimize the transmit precoding matrices for maximization of the achievable bit rate (ABR) of the system subject to a joint node transmit power constraint. We provide a unified solution for the precoding matrices, which subsumes the solutions for pure single-carrier and pure multicarrier MIMO DF relay systems as special cases. Specifically, the optimal structure of the precoding matrices is obtained by exploiting the relation between our design and conventional point-to-point MIMO transceiver designs. With the optimal precoding structure, the optimization problem reduces to a convex power allocation problem, for which an efficient closed-form solution is derived. Numerical results are provided to confirm the excellent ABR performance of the proposed relaying schemes.
28 Jul 2014
TL;DR: This paper considers a low complexity pragmatic FDMA (Frequency Division Multiple Access) system employing OQPSK (Offset Quaternary Phase Shift Keying) modulations with quasi-constant envelope that increases the overall spectral efficiency by considering total spectral overlapping of two different users.
Abstract: It is widely accepted that SC-FDE (Single Carrier with Frequency Domain Equalization) schemes are preferable for the uplink of broadband wireless systems since these signals have lower PAPR (Peak to Average Power Ratio) than OFDM (Orthogonal Frequency Division Multiplexing) signals. However, when we want to employ power-efficient grossly nonlinear amplifiers, as in satellite communications, the SC signals must have quasi-constant envelopes which have a spectral occupation much higher than the minimum Nyquist band, resulting in low spectral efficiency. In this paper we consider a low complexity pragmatic FDMA (Frequency Division Multiple Access) system employing OQPSK (Offset Quaternary Phase Shift Keying) modulations with quasi-constant envelope that increases the overall spectral efficiency by considering total spectral overlapping of two different users. To mitigate the overall interference, we present an iterative frequency-domain receiver with parallel multiple user detection capable to cope with ISI (Inter-Symbol Interference), CCI (Co-Channel Interference) levels inherent to the spectral overlapping, and IQI (In-phase/Quadrature Interference), the interference between the in-phase (I) and quadrature (Q) components of the OQPSK signals, for severely time-dispersive channels.
18 May 2014
TL;DR: Simulation results reveal the proposed estimation algorithm of the single-carrier spatially multiplexed data streams is quite robust and very close to the perfect diversity estimation in dynamic MIMO systems.
Abstract: A dynamic multiple-input-multiple-output (MIMO) system with carrier selection (CS) at the transmitter side and single-carrier frequency domain equalization (SCFDE) at the receiver side over dispersive Nakagami-m fading channels is examined. The estimation algorithm of the single-carrier spatially multiplexed data streams is proposed. Estimate the number of transmit diversity as the input information of the SCFDE, and then process the received data adaptively. Operationally, a unique word embedded with pseudo-noise codes has been used not only for stopping error propagation but also for identifying how many transmit antennae at the receiver side at the expense of little complexity. Simulation results reveal our proposed scheme is quite robust and very close to the perfect diversity estimation in dynamic MIMO systems.
Dissertation•
01 Sep 2014
TL;DR: This thesis considers the use of FTN signaling for the uplink of broadband wireless systems employing SC-FDE based on the Iterative Block with Decision Feedback Equalization (IB-DFE) receiver with a simple scheduled access Hybrid Automatic Repeat reQuest (H-ARQ) specially designed taking into account the characteristics ofFTN signals.
Abstract: In a wireless broadband context, multi-path dispersive channels can severely affect data communication of Mobile Terminals (MTs) uplink. Single Carrier with Frequency-Domain Equalization (SC-FDE) has been proposed to deal with highly dispersive channels for the uplink of broadband wireless systems. However, current systems rely on older assumptions of the Nyquist theorem and assume that a system needs a minimum bandwidth 2W per MT. Faster-Than-Nyquist (FTN) assumes that it is possible to employ a bandwidth as low as 0.802 of the original Nyquist bandwidth with minimum loss despite this, the current literature has only proposed complex receivers for a simple characterization of the wireless channel. Furthermore, the uplink of SC-FDE can be severely affected by a deep-fade and or poor channel conditions; to cope with such difficulties Diversity Combining (DC) Hybrid ARQ (H-ARQ) is a viable technique, since it combines the several packet copies sent by a MT to create reliable packet symbols at the receiver. In this thesis we consider the use of FTN signaling for the uplink of broadband wireless systems employing SC-FDE based on the Iterative Block with Decision Feedback Equalization (IB-DFE) receiver with a simple scheduled access Hybrid Automatic Repeat reQuest (H-ARQ) specially designed taking into account the characteristics of FTN signals. This approach achieves a better performance than Nyquist signaling by taking advantage of the additional bandwidth employed of a root-raised cosine pulse for additional diversity. Alongside a Packet Error Rate (PER) analytical model, simulation results show that
01 Jan 2014
TL;DR: In this article, the diversity gain of Alamouti MIMO SC-FDE in frequency selective channels was analyzed under linear equalizers such as zero forcing (ZF) and MMSE equalizers.
Abstract: Single-Carrier Frequency Domain Equalizer (SC- FDE) scheme has several advantages than multi-carrier scheme OFDM. SC-FDE avoids all the drawbacks of OFDM. This paper analyzes the diversity gain of multi-input-multi-output (MIMO) SC- FDE in frequency selective channels. This paper fully analyzes the Alamouti signaling scheme under linear equalizers such as Zero- forcing (ZF) and MMSE equalizers. The diversity gain is function of channel memory v, data block length L, data rate R and antenna configuration. Below a threshold rate full diversity is achieved, while at higher rate diversity decreases. Our analysis shows that the diversity of Alamouti MIMO SC-FDE is improved at higher rates i.e twice the diversity of conventional SISO scheme.
01 Jan 2014
TL;DR: It is shown that these frequency-domain receivers can compensate the Doppler effects associated to different multipath components while performing the equalization procedure, and are suitable for SC-FDE broadband transmission in the presence of fastvarying channels.
Abstract: Conventional frequency-domain receivers require an invariant channel within the block duration and the performance is severely affected in presence of strong Doppler effects. In this paper we propose an iterative receiver for SC-FDE (Single-Carrier with Frequency Domain Equalization) schemes able to attenuate the impact of strong Doppler effects. It is shown that these frequency-domain receivers can compensate the Doppler effects associated to different multipath components while performing the equalization procedure. Our performance results show that the proposed receivers have good performance, even when the Doppler drifts are not identical for different multipath components (in fact, we can even cope with drifts that are substantially). Therefore, our receivers are suitable for SC-FDE broadband transmission in the presence of fastvarying channels.
01 Sep 2014
TL;DR: This paper takes a study on a dual-mode (DD-LMS+MCMA) blind equalization algorithm applied in a single-carrier system and builds the simulation model of image transmission in SC-FDE system and gets the direct and better result through the comparative analysis of image.
Abstract: The traditional equalization technologies expose some shortages while people put forward higher demand to quality of communication system and transmission rate. Single-carrier frequency-domain equalization SC-FDE is becoming a research hotspot in wideband wireless communication area because of its special predominance. In recent years, the research on SC-FDE develops quickly. We take a study on feasibility of building SC-FDE system by comparing performance with orthogonal frequency division multiplexing. This paper takes a study on a dual-mode direct decision-least mean square+modify constant modulus algorithm blind equalization algorithm applied in a single-carrier system. And then, we build the simulation model of image transmission in SC-FDE system and get the direct and better result through the comparative analysis of image. Copyright © 2012 John Wiley & Sons, Ltd.
23 Jul 2014
TL;DR: It is shown, by computer simulation, that CDP-CE keeps the normalized mean square error (NMSE) performance similar to that under the perfect knowledge of channel state information even in a very high mobility environment.
15 Dec 2014
TL;DR: A new dimension for treating the multipath propagation problems is explored by combining SC/FDE and multiusers transmission technique IFDMA, a broadband technique that is effective and robust in frequency selective fading channels.
Abstract: The Interleaved frequency division multiple access (IFDMA), a multicarrier modulation is treated in this paper as an orthogonal multiple access technique and hence applied to the single carrier with frequency domain equalization (SC/FDE) technique. A new dimension for treating the multipath propagation problems is therefore explored by combining SC/FDE and multiusers transmission technique IFDMA. SC/FDE, a broadband technique is effective and robust in frequency selective fading channels. Further, a kind of constant envelope signals that reduce the impact of power stages non-linearity effects, become obtainable and outperform OFDM technique. SC/FDE proposes block transmission and naturally suits the IFDMA that also implies the block transmission. The combined techniques can apply the equalization in frequency domain which advantageously replaces the time domain equalization.
Journal Article•
TL;DR: In this article, the authors proposed a novel analog single-carrier transmission with frequency-domain equalization (analog SC-FDE) for radio broadcasting, and showed that a joint use of space-time transmit diversity (STTD) and receive antenna diversity significantly improves performance of their proposed analog SC-FCDE under a perfect knowledge of channel state information at the receiver.
Abstract: In order to improve performance of analog signal transmission, we recently proposed a novel analog single-carrier transmission with frequency-domain equalization (analog SC-FDE). Additionally, we showed that a joint use of space-time transmit diversity (STTD) and receive antenna diversity significantly improves performance of our proposed analog SC-FDE under a perfect knowledge of channel state information at the receiver. In this paper, the well-known cyclic delay pilot channel estimation (CDP-CE) is considered and the impact of channel estimation error is studied for an application of analog SC-FDE to, as an example, radio broadcasting. It is shown, by computer simulation, that CDP-CE keeps the normalized mean square error (NMSE) performance similar to that under the perfect knowledge of channel state information even in a very high mobility environment. Keyword Analog signal transmission,Frequency-domain equalization,Single-carrier transmission,STTD, Receive antenna diversity, Cyclic delay pilot, Channel estimation