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.
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Journal Article•
TL;DR: A simulation of the GFDM transmitter in a noisy channel will be conducted, and the spectrum benefit of GFDM over OFDM is treated, which will be used in applications such as machineto-machine communications or cognitive radio.
Abstract: GFDM (Generalized Frequency Division Multiplexing) is a multi-carrier multiplexing scheme for next generations of cellular networks. In this paper, a simulation of the GFDM transmitter in a noisy channel will be conducted. The spectrum benefit of GFDM over OFDM (Orthogonal Frequency Division Multiplexing) is treated, which will be used in applications such as machineto-machine communications or cognitive radio. The behavior of GFDM after passing on the AWGN (Additive White Gaussian Noise) channel for different values of SNR (Signal-to-Noise Ratio) will be observed, as well as the GFDM behavior after passing through the Rayleigh channel.
7 citations
Cites background from "Frequency domain equalization for s..."
...However, it has some disadvantages like sensitivity in ICI (Inter-Carrier Interference) and a high PAPR (Peak-to-Average Power Ratio) [1]....
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...In addition, the CP (Cyclic Prefix) is not efficient in the spectrum and it fails when the distribution of delay in the channel is longer than the CP length, which will result in ISI (InterSymbol Interference) [2]....
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15 Oct 2007
TL;DR: Joint Tomlinson-Harashima precoding and frequency-domain equalization (FDE) is considered to obtain the frequency-diversity gain while suppressing the residual ISI after FDE in a frequency-selective Rayleigh fading channel.
Abstract: In the next generation mobile communication systems, high-speed and high-quality packet data services are demanded. Hybrid ARQ (HARQ) is known as one of the promising error control techniques for wireless packet transmission. However, in a severe frequency-selective fading channel, the single-carrier (SC) HARQ throughput performance degrades due to inter-next generation mobile communication hybrid ARQ intersymbol interference Tomlinson-Harashima precoding frequency-domain equalization frequency-diversity gain Rayleigh fading channelsymbol interference (ISI). In this paper, we consider joint Tomlinson-Harashima precoding (THP) and frequency-domain equalization (FDE) to obtain the frequency-diversity gain while suppressing the residual ISI after FDE. We evaluate, by computer simulation, the SC HARQ throughput performance using joint THP/FDE in a frequency-selective Rayleigh fading channel.
7 citations
Cites background or methods from "Frequency domain equalization for s..."
...Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can significantly improve the bit error rate (BER) performance of SC transmission [4-6]....
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...It was shown in [4] that when FDE is used alone, the best BER performance can be achieved by MMSE-FDE....
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12 Nov 2007
TL;DR: Options for the evolution of WiMedia's OFDM-based UWB Physical Layer to provide 1-2 Gbps are explored, and a range of possible methods to achieve the targeted data rates are evaluated, including a variety of MIMO-based techniques.
Abstract: We explore options for the evolution of WiMedia's OFDM-based UWB Physical Layer to provide 1-2 Gbps. Starting with a brief review of the current 480 Mbps WiMedia UWB physical layer, we consider first 'simple' options for expanding capacity and their limitations. We then estimate the channel capacity of multiple antenna UWB systems and evaluate a range of possible methods to achieve the targeted data rates, including a variety of MIMO-based techniques.
7 citations
01 Mar 2007
TL;DR: A novel estimation method for the estimation of the received SNR of GOFDM signal that is required in the adaptive modulation and coding (AMC) is presented and the simulation results of the estimated SNR show excellent correlation with the analytical results.
Abstract: GOFDM (generalized OFDM) has been proposed as a tradeoff solution between cyclic prefix single carrier (CP-SC) and OFDM system that can alleviate the peak to average power ratio (PAPR) problem of OFDM. In this paper, a novel estimation method for the estimation of the received SNR of GOFDM signal that is required in the adaptive modulation and coding (AMC) is presented. The simulation results of the estimated SNR show excellent correlation with the analytical results. Furthermore, the received SNRs of the GOFDM exhibit repetition of as set values that can be clustered for modulation and coding scheme (MCS) allocation in group-based AMC. The paper also presents various performances of the proposed GOFDM with AMC and compares them with the corresponding performance of OFDM and CP-SC under same operating conditions.
7 citations
Cites background from "Frequency domain equalization for s..."
...GOFDM [2] has been proposed as a bridge between CP-SC [1] and OFDM transmission....
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01 Nov 2016
TL;DR: Computer simulation confirms that both SLM techniques are able to reduce the PAPR of SC-FDE signal without significant degradation of bit-error rate performance and spectrum efficiency.
Abstract: Single-carrier transmission with frequency-domain equalization SC-FDE is widely known as a promising transmission technique providing low error probability with low peak-to-average power ratio PAPR of transmit signal. However, the low-PAPR property of SC-FDE cannot be maintained if multi-level data modulation is introduced. The low-PAPR property of SC-FDE can be maintained by applying transmit filtering with roll-off factor at the expense of spectrum efficiency. In this paper, we propose two types of selected mapping SLM to reduce the PAPR of SC-FDE transmit signal. The first SLM technique is conducted in the frequency domain, where the phase rotation is applied to subcarriers similar to the SLM technique for orthogonal frequency division multiplexing transmission. The second SLM technique is conducted in the time domain, where the phase rotation is applied directly to data-modulated symbol sequence. Computer simulation confirms that both SLM techniques are able to reduce the PAPR of SC-FDE signal without significant degradation of bit-error rate performance and spectrum efficiency. Copyright © 2016 John Wiley & Sons, Ltd.
7 citations
Cites background from "Frequency domain equalization for s..."
...On the other hand, single-carrier transmission with frequency-domain equalization (SC-FDE) [4] is attractive for uplink communication because of its lower PAPR, while the use of FDE can effectively suppress the impact of inter-symbol interference....
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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