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MIMO-OFDM WIRELESS COMMUNICATION SYSTEM PERFORMANCE ANALYSIS FOR CHANNEL ESTIMATION: A REVIEW
1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 10 Issue: 04 | Apr 2023 www.irjet.net p-ISSN: 2395-0072 © 2023, IRJET | Impact Factor value: 8.226 | ISO 9001:2008 Certified Journal | Page 380 MIMO-OFDM WIRELESS COMMUNICATION SYSTEM PERFORMANCE ANALYSIS FOR CHANNEL ESTIMATION: A REVIEW Sanjay Kumar1, Mr. Pradeep Pal2 1M.Tech, Electronic and Communication Engineering, GITM, Lucknow, India 2Assistant Professor Electronic and Communication Engineering, GITM, Lucknow, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - MIMO-OFDM (Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing) is a wireless communication technology that combines two advanced techniques: Multiple Input Multiple Output (MIMO) and Orthogonal Frequency Division Multiplexing (OFDM). MIMO technology involves using multiple antennas at both the transmitter and receiver ends to improve the overall performance and capacity of the wireless communication system. By using multiple antennas, MIMO can increase the data rate, reduce interference, and improve the range of the wireless link. OFDM is a digital multi-carrier modulation technique that divides the available bandwidth into multiple orthogonal subcarriers. Each subcarrier carries a portion of the data, and the subcarriers are modulated and transmitted simultaneously. This makes OFDM an effective technique for mitigating the effects of multipath fading and interference in wireless communication systems. MIMO-OFDM is widely used in many wireless communication systems, such as 4G LTE, Wi- Fi, and WiMAX, to provide high-speed and reliable wireless communication. It provides several advantages, including increased data rate, improved spectral efficiency, enhanced reliability, and improved resistancetofadingand interference, compared to traditional single-antenna and single-carrier communication systems. Key Words: MIMO-OFDM, Channel Estimation, Pilot carriers, Minimum Mean square error. 1. INTRODUCTION Mobile communication systemsarewirelesscommunication networks that provide communication services to mobile devices, such as smartphones, tablets, and laptops. These systems allow users to communicate with each other and with the outside world, regardless of their physical location. Mobile communication systems typically consist of a network of base stations, each with a defined coverage area, and mobile devices that are used by the users to communicate. The base stations are connected to the core network, which provides the necessary infrastructure and services to support communicationbetweenmobiledevices. Mobile communication systems use a varietyoftechnologies and standards, including cellular networks, Wi-Fi, and satellite communication, to provide a range of communication services, such as voice, text, and multimedia messaging, as well as high-speed data services. With the widespread adoption of mobile devices and the growing demand for mobile data services, mobile communication systems have become an integral part of modern society, enabling peopletostayconnectedwith each other and the world around them at all times. 1.1. MIMO-OFDM Multiple Input Multiple Output (MIMO) is a wireless communication technology that involves using multiple antennas at both the transmitter and receiver ends of a wireless link. The goal of MIMO is to improve the performance and capacity of wireless communication systems. In MIMO systems, multiple antennas are used at both the transmitting and receiving ends to simultaneously transmit and receive multiple data streams. This allows the system to effectively exploit the spatial diversity of the wireless channel, resulting in increased data rates, reduced interference, and improved link range.MIMOtechnologycan be applied in both single-user and multi-user scenarios, and it is widely used in many wireless communication systems, such as 4G LTE, Wi-Fi, and WiMAX, to provide high-speed and reliable wireless communication. MIMO can be implemented in different configurations, such as spatial multiplexing, beamforming, and diversity combining. The choice of MIMO configuration depends on the specific requirementsandconstraintsofthewirelesscommunication system. Overall, MIMO is a key technology for improving the performance and capacity of wireless communication systems, and it will continue to play an important role in the development of future wireless communication systems. Orthogonal Frequency Division Multiplexing (OFDM) is a digital multi-carrier modulation technique used in wireless communication systems. It divides the available bandwidth into multiple orthogonal subcarriers, each of whichcarriesa portion of the data. The subcarriers are modulated and transmitted simultaneously, and the data isreconstructed at the receiver. The main advantage of OFDM is its ability to effectively combat the effects of multipath fading and interference in wirelesscommunicationsystems.Bydividing the available bandwidth into multiple subcarriers,eachwith a relatively narrow bandwidth, OFDM can mitigate the effects of fading and interference by spreading the data over multiple subcarriers. OFDM is widely used in many wireless communication systems, such as 4G LTE, Wi-Fi, and Digital
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 10 Issue: 04 | Apr 2023 www.irjet.net p-ISSN: 2395-0072 © 2023, IRJET | Impact Factor value: 8.226 | ISO 9001:2008 Certified Journal | Page 381 Video Broadcasting (DVB), to provide high-speed and reliable wireless communication. It is also used in broadband wired communication systems, such as Digital Subscriber Lines (DSL) and cable modems, to provide high- speed data services over copper and coaxial cables. OFDM provides several advantages, including increased data rate, improved spectral efficiency, enhanced reliability, and improved resistance to fading andinterference,comparedto traditional single-carrier modulation techniques. Overall, OFDM is an important technology for improving the performance and capacity of wireless communication systems, and it will continue to play a significant role in the development of future wireless communication systems. 1.2. MIMO - OFDM SYSTEM Multiple Input Multiple Output (MIMO) - Orthogonal Frequency Division Multiplexing (OFDM) is a wireless communication system that combines the benefits of both MIMO and OFDM technologies. MIMO-OFDM systems use multiple antennas at both the transmitter and receiver ends of a wireless link, along with the OFDM modulation technique, to improve the performance and capacity of the wireless communication system. In MIMO-OFDM systems, the available bandwidth is divided into multiple orthogonal subcarriers, each of which carries a portion of the data. The multiple antennas at both the transmitter and receiver are used to transmit and receive multiple data streams simultaneously, effectively exploiting the spatial diversityof the wireless channel to provide improved data rates, reduced interference, and increased link range. MIMO-OFDM is widely used in many wireless communication systems, such as 4G LTE and Wi-Fi, to provide high-speed and reliable wireless communication. The combination of MIMO and OFDM technologies provides several advantages, including increased data rate, improved spectral efficiency, enhanced reliability, and improved resistance to fading and interference, compared to traditional single-antenna and single-carrier modulation techniques. Overall, MIMO-OFDM is a key technology for improving the performance and capacity of wireless communication systems, and it will continue to play a significant role in the development of future wireless communication systems. 2. LITERATURE REVIEW In this literature survey section, we have studied the previous research paper related to the MIMO-OFDMsystem, the summary of these papers is given below in the detail: Ganesh et.al: MIMO-OFDM channel estimation under Rayleigh fading is studied. Simulations are run using two distinct techniques, LS channel estimation, and MMSE channel estimation. The simulation findings demonstrate that the BER is lower when using a comb-type pilot carrier for channel estimation in a MIMO- OFDM system than when using a block-type pilot carrier, and that the MSE is lower when using MMSE than when using LS channel estimation. The results show that the MMSE channel estimator outperforms the LS channel estimator. Abdelhakim, Ridha: We suggest assessing the impact of channel length on the efficiency of LSandLMMSEestimation methods for LTE Downlink networks.ToreduceICIandISI,a cyclic prefix is appended to the beginning of each OFDM symbol that is at least as long as the channel. Unfortunately, the channel may exhibit unexpectedbehaviorthatcausesthe CP length to fall short of the channel length. The LMMSE outperforms the LS estimator in simulations when the CP length is comparable to or greater than the channel length, but at the expense of complexity due to its dependence on the channel and noise statistics. On the otherhand,LMMSE's superior performance is limited to low SNR values and gradually decreases as SNR increases. Comparatively, LS outperforms LMMSE in this range of SNR values. Archana et.al: The results of this research show that in the low-to-medium signal-to-noise ratio (SNR) range,theBER is much lower in the STBC-OFDM system compared to the SM- OFDM system. Therefore, STBC-OFDM may be employed to improve performance even at low SNR. Nonetheless, SM- OFDM can not only deliver double the throughput but also a negligible error rate at high SNR. According to the findings, OFDM may be integrated with STBC or SM systems. The quality of received pictures sent by both models is assessed with throughput and BER. The output images corroborate previous findings that the STBC-OFDM system createsmuch less noise in the received picture than the SM-OFDM model. Research into MIMO-OFDM hybrid models may be required to better comprehend the receiver's power consumption pattern and design complexity about bit error rate and throughput rate. Juhi et.al: The need formobiledata serviceshasskyrocketed in recent years, and certain mobile carriers have seen even more rapid expansion than the industry average. A recent prediction indicates that mobile data traffic will double annually through 2014, amounting to a compound annual growth rate of about 100% worldwide. LTE-Advanced and WiMAX- 2 can employ up to 8x8 MIMO, depending on the system's level of development. Demodulation/detection and channel state information estimation both benefit from the introduction of new reference signals. That's why modern SU/MU-MIMO systems have focused so intently on improving their signaling. However, one of the primary difficulties in implementing MIMO incellularnetworksisthe extreme vulnerability of MIMO receivers to channel interference. If system designers want to limittheamountof disruption they cause to adjacent cells, they'll need to dial down the transmissionpoweranddata rate.However,dueto their inherent design, MIMO systems need a higher received signal-to-interference-noise power ratio to transmit the
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 10 Issue: 04 | Apr 2023 www.irjet.net p-ISSN: 2395-0072 © 2023, IRJET | Impact Factor value: 8.226 | ISO 9001:2008 Certified Journal | Page 382 same amount of data (SINR). Receiver and transmitter advancements in signal processing have been employed to mitigate or eliminate interference. Thus, we were able to learn from this text that a MIMO systemonlyinvolvesusinga transmitter and receiver equipped with many antennas. Its purpose is to improve network stability and data transfer rate without requiring more bandwidth or power to communicate. Processing techniques including pre-coding, diversity coding and special multiplexing distinguish between the two primary types of MIMO: multi-user and single-user. When it comes to Multiple-Input Multiple- Output communications, reconfigurableantennashavebeen employed to create pattern and frequency diversity. This article shows that the majority of these methods have significant practical limitations, especially when it comes to the complexity and channel information necessary for their effective application to 3G cellular networks. Vipin, Parveen: ThisstudyrevealsthattheMSKmodulation scheme performs admirably in the scenario of multi-bit transmission from the MIMO OFDM system. Throughput, Bit Error Rate, Ergodic Capacity, Symbol Error Rate, Signal-to- Noise Ratio, and Outage Capacity are some of the metrics used to evaluate MSK modulation's efficacy. The ongoing study clears several paths for researchers of the future to explore. B.K. Mishra et.al: Different modulation schemes, such as QPSK, 16-QAM, and 64-QAM in a MIMO-OFDM system, have been shown to perform differently when it comestochannel estimation using Least Mean Squared (LMS), Leaky Least Mean Squared (LLMS), and Modified Leaky Least Mean Square (MLLMS) algorithms. The primary goal is to increase SNR and decrease BER by manipulating the step size. As can be seen from the data shown above, decreasing the step size (=0.0025) improves the steady-state error uptothe rangeof 0.96 to 10-1 and the SNR value up to the range of 15 to 5 dB. also Based on the results of a comparative analysis, it appears that the Modified Leaky Least Mean Square algorithm performs betterthantheLeakyLeastMeanSquare algorithm and the Least Mean Square algorithm when used in conjunction with a MultipleInputMultipleOutput(MIMO) and Orthogonal Frequency Division Multiplexing (OFDM) system. We found that the MLLMS method had the best improvement percentile among the tested algorithms. The results show that the Modified Leaky Least Mean Square algorithm has the lowest BER and maximum SNR, allowing for the largest possible channel capacity for data transmission. By optimizing for low BER, high SNR, and small MSE, the Modified Leaky LMS (MLLMS) algorithm boosts channel capacity (MSE). Monika, Mahendra: It is stated that MIMO-OFDM systems, with the help of channel estimate methods, have the potential to meet the requirements of future wireless communication systems. The effectiveness of different channel estimating methods, including those based on training data, channel observation, and hybrid methods, are also reviewed. In contrast to the LS and ALS estimators, the MMSE channel estimator may provide estimatesina shorter amount of time despite its complexity. Yu et al: recommended benefiting from the synergy of MIMO, cognitive radio, and orthogonal frequency division multiplexing. Using orthogonal space-time block codes in MIMO, they claim to be able to maximize the digital transmission rate while reducing the effects of multipath fading and improving BER performance. Since the combination increases the signal-to-noise ratio, their findings are also positive (SNR). Gupta et al: We propose combining MIMO and OFDM systems with wideband transmission to reduce intersymbol interference and boost performance. They have argued that the system's performance may be enhanced by including spatial and frequency variety. A variety of equalizers and space-frequency (SF) block coding has been studied for MIMO-OFDM.The best equalizationstrategyforBERanalysis has been proposed. Jie et al: advocated for a MIMO-OFDM system hybrid as a means to increase data transmission speeds. Specifically, they have proposed a scenario in which multi-path effects and frequency selective fading coexist. Compared to MIMO OFDM without STBC, they discovered that the BER performance of the latter was superior. Darsena et al: Discuss the use of the cyclic prefix OFDM in MIMO broadband wireless communication systems (CP). It plays a role in the STFBC formula. As a solution, they have offered two MIMO channel shortens. It is dependent on the linearly restricted minimization of the mean output energy of the signal at the reduced channel's output. Their findings demonstrate that the suggested blind channel shortens approach suffers just a small performance hit when compared to non-blind channel shorteners, and this is achieved without significantly increasing the computational complexity of the system. Xin et al: In this presentation, we analyzed MIMO-OFDM systems with Rayleigh fading channels using adaptive modulation (AM) with a discrete rate. In this case, the fading gain value is segmented into many areas for each sub- channel. The modulation determines the adjustmentsmade. The average BER and spectral efficiency (SE) have been gathered. As a consequence of their work, wenowknowthat the enhanced switching-basedSEapproachissuperiortothe conventional one. Seyman et al: The authors propose a feed-forward multilayer perceptron (MLP) neural network, trained using the Levenberg-Marquardt method, for estimating channel parameters in MIMO-OFDM systems. Comparing the suggested approachforperformanceassessmentwiththebit
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 10 Issue: 04 | Apr 2023 www.irjet.net p-ISSN: 2395-0072 © 2023, IRJET | Impact Factor value: 8.226 | ISO 9001:2008 Certified Journal | Page 383 error rate (BER)andmeansquare error(MSE)performances of least square (LS) and least meansquare(LMS)algorithms, they find that the neural network channel estimator outperforms both. Vakilian et al: An antennae-basedMIMOOFDMsystemwith space-frequency (SF) block coding was proposed. Radiation patterns that can be changed are employed. They think the reconfiguration must be performed automatically on their part. Their suggested method may support frequency diversity, reconfigurable radiation patterns, and spatial variety over fading channels that are selective in one or more frequencies. According to their findings, their method outperforms competing SF codes in terms of variety and coding gain. Doi et al: Joint decoding of block-coded signals in an overloaded MIMO-OFDM system was presented, and its complexity was kept to a minimum. For the block-coded signals, they suggest a collaborative decoding approach that uses two stages. The measures they use to narrow down the pool of possible codewords are efficiently calculated. This is because joint maximum likelihood symbol detection is used in the decoding process. The number of possible codewords is cut down effectively using their suggested approach.They have shown a complexity reduction of around 1/174 while transmitting 4 signal streams. Chen et al: Data concealment using the orthogonal frequency division multiplexing (OFDM) technique was demonstrated over an error-correcting coded channel. The effects of antenna diversity, maximum multipath delay, and Doppler shift have been demonstrated. This demonstrates the BER performance of the MIMO-OFDM. When compared to other coding channels like SISO and OFDM as well as MIMO, the MIMO-OFDM system is less accurate. The data concealing capability, the BER of the carrier data, and the BER of the secret data are all taken into account. Sharma et al: It is hypothesized that the MIMO system is effective in the likelihood of information detection and can send and receive data using several antennas at once. To increase spectral efficiency and decrease ISI, they have combined OFDM and MIMO systems. Sezer et al.: Taking into account both average and peak power limits, we provide a solution to the optimum channel switching issue to maximize the average capacity of the transmitter's connection with the main receiver. For the optimization problem where the solution meets the conditions equally,theauthorspresentanalternativesimilar optimization problem. Their theoretical findings have been backed up by numerical instances. Li et al: We spoke about the k-user MIMO interference channel, which requires M transmit antennas and N reception antennas. They suggest an interference cancellation strategy to boost receivers' access to global channel state information (CSI). If simply the limitation on degrees of freedom was imposed, their suggested strategy would perform better than existing methods in terms of resisting the correlation of transmitters and tolerating interferences. EI et al: Advised a comprehensive and realistic simulation for forecasting RoF system performance. A 60 GHz 2x2 MIMO-OFDM RoF system has beenproposed.Itispredicated on spatial variety (SD). Spatial multiplexing (SMX), which boosts data rate but not necessarily reliability, is aided by this. They tested this system in a line-of-sight (LOS) desktop environment and compared its performance using a variety of approaches, such as diversity, modulation, and channel coding rate. A greater data rate may be attained with a 22 MIMO OFDM SMX system, they discovered. Namitha et al: The high peak-to-average power ratio (PAPR) across separate antennas has been proposed as a problem with the MIMO-OFDM technology. Selective mapping (SLM) has been proposed as a method forlowering PAPR in OFDM and MIMO-OFDM without introducing any signal distortion. They see the need of delivering side information (SI) with each OFDM data symbol as a shortcoming of the SLM approach to transmission.Usingthe Hadamard sequence, they haveshowna simpleSLMmethod. They theorized that without communicating SI, it might significantly lower PAPR in MIMO-OFDM systems. Qiao et al: We propose a combination ofMIMOandOFDMto increase the efficiency of the necessary bandwidth for underwater acoustic (UWA) transmissions. In the direction of MIMO-OFDM communication at UWA,theyhavesurveyed and reported their findings. The complexity andefficiencyof the algorithms have been compared across the various papers. 3. CONCLUSION The principal component analysis (PCA) technique for channel transformation and the benefits of applying BSS methods in MIMO multiuser detection are highlighted. The usefulness and efficacy of DWTs have also been proved in the context of signal de-noising, which is shown in the results section. As shown, the proposed Enhanced ICA system is both more successful atsignal separationandmore resistant to channel noise, whether it is BER or impulsive noise. The findingsshowthat thesuggestedsystemimproves in terms of BER performance and robustness, while the complexity of the detector system is reduced. Furthermore, the suggested technique is successful regardless of the length of the input data, making it a particularly attractive option for large datasets. The suggested Enhanced ICA is utilized to address these problems,anditismoresensitiveto the starting settings for the input weight of the separation matrix than the current MN-IAMO and COA techniques.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 10 Issue: 04 | Apr 2023 www.irjet.net p-ISSN: 2395-0072 © 2023, IRJET | Impact Factor value: 8.226 | ISO 9001:2008 Certified Journal | Page 384 REFERENCE [1] A. Ladaycia, A. Mokraoui, K. A. Meraim, and A. Belouchrani, “Performance bounds analysis for semi-blind channel estimation in MIMOOFDM communications systems”, IEEE Transactions on Wireless Communications, Vol. 16, No. 9, pp. 5925-5938, 2017. [2] T. Peken, G. Vanhoy, and T. Bose, “Blind channel estimation for massive MIMO”, Analog Integrated Circuits and Signal Processing, Vol. 91, No. 2, pp. 257-266, 2017. [3] A. Saci, A. A. Dweik, A. Shami, and Y. Iraqi,“One-shotblind channel estimation for OFDM systems over frequency- selective fading channels”, IEEE Transactions on Communications, Vol. 65, No. 12, pp. 5445- 5458, 2017. [4] A. Ladaycia, A. Belouchrani, K. A. Meraim, and A. Mokraoui, “EM-based semi-blind MIMOOFDM channel estimation”, In Proc. of IEEEInternational Conf.onAcoustics, Speech and Signal Processing, pp. 3899-3903, 2018. [5] R. Bhandari and S. Jadhav, “Spectral efficient blind channel estimation technique for MIMOOFDM communications”, International Journal of Advances in Applied Sciences, Vol. 7, No. 3, pp. 286-297, 2018. [6] B. Zhang, J. L. Yu, Y. Yuan, and J. W. Lai, “Fast blind channel estimationforspace–timeblock codedMIMO–OFDM systems”, Telecommunication Systems, Vol. 65, No. 3, pp. 443-457, 2017. [7] J. Yin, G. Yang, D. Huang, L. Jin, and Q. Guo,“Blindadaptive multi-user detection for under ice acoustic communications with mobile interfering users”, The Journal of the Acoustical Society of America, Vol. 141, No. 1, pp. EL70- EL75, 2017. [8] V. K. Gupta and S. Vijay, “A Summative Comparison of Blind Channel Estimation Techniques for Orthogonal Frequency Division Multiplexing Systems”, International Journal of Electrical & Computer Engineering, Vol. 8, No. 5, pp. 2744-2752, 2018. [9] B. Gupta, S. Gupta, A. K. Singh, and H. D. Joshi, “Optimised periodic precoder-based blindchannel estimationforMIMO- OFDM systems”, International Journal of ElectronicsLetters, Vol. 6, No. 3, pp. 347-363, 2018. [10] W. Zhang, F. Gao, H. Minn, and H. Wang, “Scattered pilots-based frequency synchronizationformultiuserOFDM systems with a large number of receive antennas”, IEEE Transactions on Communications, Vol. 65, No. 4, pp. 1733- 1745, 2017. [11] E. Nayebi and B. D. Rao, “Semi-blind channel estimation for multiuser massive MIMO systems”, IEEETransactionson Signal Processing, Vol. 66, No. 2, pp. 540-553, 2017. [12] Y. Huang, Y. He, Q. Luo, L. Shi, and Y. Wu, “Channel estimation in MIMO–OFDMsystemsbasedona newadaptive greedy algorithm”, IEEE Wireless Communications Letters, Vol. 8, No. 1, pp. 29-32, 2018. [13] M. M. Awad, K. G. Seddik, and A. Elezabi, “Low- complexity semi-blind channel estimation algorithms for vehicular communications using the IEEE 802.11 p standard”, IEEE Transactions on Intelligent Transportation Systems, Vol. 20, No. 5, pp. 1739-1748, 2018. [14] B. Zhang, J. L. Yu, Y. Yuan, and C. Y. Wu, “Convergence- enhanced subspace channel estimation for MIMO-OFDM systems with virtual carriers”, Circuits, Systems, and Signal Processing, Vol. 36, No. 6, pp. 2384-2401, 2017. [15] R. Tang, X. Zhou, and C. Wang, “A Haar wavelet decision feedback channel estimation method in OFDM systems”, Applied Sciences, Vol. 8, No. 6, p. 877, 2018. [16] S. Nandi, N. N. Pathak, and A. Nandi, “Implementationof fast, adaptive, optimized blind channel estimation for multimodal MIMO‐ OFDM systems using MFPA”, Intelligent Multimodal Data Processing, pp. 183-204, 2021. [17] S. Nandi, N. N. Pathak, and A. Nandi, “A Novel Adaptive Optimized Enhanced Blind Channel Estimation for Cyclic Prefix Assisted Space– Time Block Coded MIMO-OFDM Systems”, Wireless Personal Communications, Vol. 115, No. 2, pp. 1317-33, 2020. [18] A. Elnakeeb and U. Mitra, “Bilinear Channel Estimation for MIMO OFDM: Lower Bounds and Training Sequence Optimization”, IEEE Transactions on Signal Processing, Vol. 69, pp. 1317-1331, 2021. [19] V. Karami and B. M. Tazehkand, “Robustblindmultiuser detection in overdetermined MIMO channels using wavelet transform”, AEU International Journal of Electronics and Communications, Vol. 117, p. 153058, 2020. [20] C. Buiquang and Z. Ye, “Constrained ALSbased tensor blind receivers for multi-user MIMO systems”, Digital Signal Processing, Vol. 84, pp. 69-79, 2019.
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