Frequency domain equalization for single-carrier broadband wireless systems
TL;DR: This article surveys frequency domain equalization (FDE) applied to single-carrier (SC) modulation solutions and discusses similarities and differences of SC and OFDM systems and coexistence possibilities, and presents examples of SC-FDE performance capabilities.
Abstract: Broadband wireless access systems deployed in residential and business environments are likely to face hostile radio propagation environments, with multipath delay spread extending over tens or hundreds of bit intervals. Orthogonal frequency-division multiplex (OFDM) is a recognized multicarrier solution to combat the effects of such multipath conditions. This article surveys frequency domain equalization (FDE) applied to single-carrier (SC) modulation solutions. SC radio modems with frequency domain equalization have similar performance, efficiency, and low signal processing complexity advantages as OFDM, and in addition are less sensitive than OFDM to RF impairments such as power amplifier nonlinearities. We discuss similarities and differences of SC and OFDM systems and coexistence possibilities, and present examples of SC-FDE performance capabilities.
Citations
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TL;DR: A novel frequency-domain equalization (FDE) scheme for single-carrier multiple-input multiple-output (MIMO) systems over time-varying channels is proposed and two scenarios in the design of filters for MIMO systems are presented.
Abstract: In this letter, we propose a novel frequency-domain equalization (FDE) scheme for single-carrier multiple-input multiple-output (MIMO) systems over time-varying channels. Based on frequency-domain decision-feedback equalization (FD-DFE), we design a feedforward filter with constraint such that the equalization can be easily realized segment-by-segment with the help of the overlap-save (OLS) method. Since the segment length and block length can be designed independently, our proposal sets relatively short segment length to obtain good performance in time-varying environments, and very long block length to achieve high spectral efficiency. Furthermore, we present two scenarios in the design of filters for MIMO systems.
Journal Article•
TL;DR: A practical and efficient channel estimator is developed for CPSC-RIS and the mean square error of the channel estimation is expressed in closed-form and an upper bound on the BER is derived by assuming the maximumlikelihood detection.
Abstract: In this paper, a cyclic-prefixed single-carrier (CPSC) transmission scheme with phase shift keying (PSK) signaling is presented for broadband wireless communications systems empowered by a reconfigurable intelligent surface (RIS). In the proposed CPSC-RIS, the RIS is configured according to the transmitted PSK symbols such that different cyclically delayed versions of the incident signal are created by the RIS to achieve cyclic delay diversity. A practical and efficient channel estimator is developed for CPSC-RIS and the mean square error of the channel estimation is expressed in closed-form. We analyze the bit error rate (BER) performance of CPSC-RIS over frequency-selective Nakagami-m fading channels. An upper bound on the BER is derived by assuming the maximumlikelihood detection. Furthermore, by resorting to the concept of index modulation (IM), we propose an extension of CPSC-RIS, termed CPSC-RIS-IM, which enhances the spectral efficiency. In addition to conventional constellation information of PSK symbols, CPSC-RIS-IM uses the full permutations of Qiang Li is with the College of Information Science and Technology, Jinan University, Guangzhou 510632, China (e-mail: qiangli@jnu.edu.cn). Miaowen Wen is with the School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510640, China (e-mail: eemwwen@scut.edu.cn). Ertugrul Basar is with the Department of Electrical and Electronics Engineering, Koç University, Istanbul 34450, Turkey (e-mail: ebasar@ku.edu.tr). George C. Alexandropoulos is with the National and Kapodistrian University of Athens, Panepistimiopolis Ilissia, Greece (e-mail: alexandg@di.uoa.gr). Kyeong Jin Kim is with the Mitsubishi Electric Research Laboratories, Cambridge, MA 02139, USA (e-mail: kkim@merl.com). H. Vincent Poor is with the Department of Electrical and Computer Engineering, Princeton University, Princeton, USA (e-mail: poor@princeton.edu). ar X iv :2 20 1. 02 05 3v 1 [ cs .I T ] 6 J an 2 02 2
01 Jan 2004
TL;DR: Working in the DIT domain reveals immdiately that tcinporal whiteness of the additive noise is unessential, only spatial whiteness matters, and the blind channel identifiability conditions become extremely weak when Zero Padded systcms are considered.
Abstract: In this paper, we revisit a number of classical blind cstimation techniques for FIR multichannels when applied to communication systems that are based on the introduction of a cyclic prefix. These techniques include techniques based on deterministic modeling of the unknown symbols such as (signal and noise) subspace fitting methods, subchannel response matching (SRM), deterministic maximum likelihood (DML), and techniques based on a Gaussian white noise model for thc unknown symbols such as Gaussian ML (GML) methods and covariance matching. The presence of a cyclic prefix transforms spatiotemporal channels into a set of parallel spatial channels, coupled by the discrete Fourier transform (DFT) of the FIR channel impulse response. The associated blind channel estimation methods become computationally much more attractive and also become more straightforward to analyze and to compare in terms of performance. Working in the DIT domain reveals immdiately that tcinporal whiteness of the additive noise is unessential, only spatial whiteness matters. Furthermore, the blind channel identifiability conditions become extremely weak when Zero Padded (ZP) systcms are considered.
14 Jun 2011
TL;DR: In the 3rd generation partnership project (3GPP) long term evolution (LTE) multiple-input single-output (MISO) system, the carrier selection algorithm for single-carrier frequency domain decision feedback equalization receiver over dispersive Nakagami-m fading channels is proposed.
Abstract: In the 3rd generation partnership project (3GPP) long term evolution (LTE) multiple-input single-output (MISO) system, the carrier selection algorithm for single-carrier frequency domain decision feedback equalization receiver over dispersive Nakagami-m fading channels is proposed. Furthermore, a unique word has been used for stopping error propagation instead of utilizing the traditional cyclic prefix method. Simulation results reveal that our proposed scheme is much greater than conventional counterparts.
Cites background from "Frequency domain equalization for s..."
...Recently, the FDE scheme has been discussed for single-carrier (SC) [2], [3] and multi-carrier (MC) signal transmissions (e....
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17 Jan 2021
TL;DR: In this article, the authors proposed distortion compensation method on SC-FDE modulation using for the mm-wave UHDTV wireless camera, which can transmit video at approximately 185 Mbps using a single-carrier transmission with frequency-domain equalization (SC-fDE) modulation scheme with a 125MHz channel bandwidth.
Abstract: This study examines the research and development of ultrahigh-definition television (UHDTV) wireless cameras that transmits 4K and 8K videos using 42-GHz band of millimeter wave (mmWave). Our developed wireless camera can transmit video at approximately 185 Mbps using a single-carrier transmission with frequency-domain equalization (SC-FDE) modulation scheme with a 125-MHz channel bandwidth. A single-carrier modulation can offer a high level of power efficiency as it is robust to power-amplifier (PA) distortion. We additionally aim to obtain higher output power in mmWave, therefore it is important that PA operates at closer saturation point with high power efficiency. In this study, we propose distortion compensation method on SC-FDE modulation using for the mmWave UHDTV wireless camera. The performance of our method is evaluated by computer simulations.
References
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Book•
01 Jan 1986
TL;DR: In this paper, the authors propose a recursive least square adaptive filter (RLF) based on the Kalman filter, which is used as the unifying base for RLS Filters.
Abstract: Background and Overview. 1. Stochastic Processes and Models. 2. Wiener Filters. 3. Linear Prediction. 4. Method of Steepest Descent. 5. Least-Mean-Square Adaptive Filters. 6. Normalized Least-Mean-Square Adaptive Filters. 7. Transform-Domain and Sub-Band Adaptive Filters. 8. Method of Least Squares. 9. Recursive Least-Square Adaptive Filters. 10. Kalman Filters as the Unifying Bases for RLS Filters. 11. Square-Root Adaptive Filters. 12. Order-Recursive Adaptive Filters. 13. Finite-Precision Effects. 14. Tracking of Time-Varying Systems. 15. Adaptive Filters Using Infinite-Duration Impulse Response Structures. 16. Blind Deconvolution. 17. Back-Propagation Learning. Epilogue. Appendix A. Complex Variables. Appendix B. Differentiation with Respect to a Vector. Appendix C. Method of Lagrange Multipliers. Appendix D. Estimation Theory. Appendix E. Eigenanalysis. Appendix F. Rotations and Reflections. Appendix G. Complex Wishart Distribution. Glossary. Abbreviations. Principal Symbols. Bibliography. Index.
16,062 citations
"Frequency domain equalization for s..." refers methods in this paper
...Adaptation can be done with LMS (least mean square), RLS, or least squares minimization (LS) techniques, analogous to adaptation of time domain equalizers [Hay96], [Cla98]....
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...Overlap-save or overlap-add signal processing techniques could also be used to avoid the extra overhead of the cyclic prefix [Fer85], [Hay96]....
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TL;DR: The analysis and simulation of a technique for combating the effects of multipath propagation and cochannel interference on a narrow-band digital mobile channel using the discrete Fourier transform to orthogonally frequency multiplex many narrow subchannels, each signaling at a very low rate, into one high-rate channel is discussed.
Abstract: This paper discusses the analysis and simulation of a technique for combating the effects of multipath propagation and cochannel interference on a narrow-band digital mobile channel. This system uses the discrete Fourier transform to orthogonally frequency multiplex many narrow subchannels, each signaling at a very low rate, into one high-rate channel. When this technique is used with pilot-based correction, the effects of flat Rayleigh fading can be reduced significantly. An improvement in signal-to-interference ratio of 6 dB can be obtained over the bursty Rayleigh channel. In addition, with each subchannel signaling at a low rate, this technique can provide added protection against delay spread. To enhance the behavior of the technique in a heavily frequency-selective environment, interpolated pilots are used. A frequency offset reference scheme is employed for the pilots to improve protection against cochannel interference.
2,627 citations
"Frequency domain equalization for s..." refers background in this paper
...OFDM transmits multiple modulated subcarriers in parallel [ 1 ]....
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...Several variations of orthogonal frequency-division multiplexing (OFDM) have been proposed as effective anti-multipath techniques, primarily because of the favorable trade-off they offer between performance in severe multipath and signal processing complexity [ 1 ]....
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TL;DR: In this contribution the transmission of M-PSK and M-QAM modulated orthogonal frequency division multiplexed (OFDM) signals over an additive white Gaussian noise (AWGN) channel is considered and the degradation of the bit error rate is evaluated.
Abstract: In this contribution the transmission of M-PSK and M-QAM modulated orthogonal frequency division multiplexed (OFDM) signals over an additive white Gaussian noise (AWGN) channel is considered. The degradation of the bit error rate (BER), caused by the presence of carrier frequency offset and carrier phase noise is analytically evaluated. It is shown that for a given BER degradation, the values of the frequency offset and the linewidth of the carrier generator that are allowed for OFDM are orders of magnitude smaller than for single carrier systems carrying the same bit rate. >
1,816 citations
TL;DR: This correspondence describes the construction of complex codes of the form exp i \alpha_k whose discrete circular autocorrelations are zero for all nonzero lags.
Abstract: This correspondence describes the construction of complex codes of the form exp i \alpha_k whose discrete circular autocorrelations are zero for all nonzero lags. There is no restriction on code lengths.
1,624 citations