TY - JOUR AU - Alrwashdeh, Monther AU - Czifra, Balazs AU - Kollár, Zsolt TI - Analysis of Quantization Noise in Fixed-Point HDFT Algorithms JF - IEEE SIGNAL PROCESSING LETTERS J2 - IEEE SIGNAL PROC LET VL - 31 PY - 2024 SP - 756 EP - 760 PG - 5 SN - 1070-9908 DO - 10.1109/LSP.2024.3372782 UR - https://m2.mtmt.hu/api/publication/34720081 ID - 34720081 N1 - Export Date: 22 March 2024 CODEN: ISPLE AB - The Discrete Fourier Transform (DFT) algorithm is widely used in signal processing and communication systems to transform the signal to the frequency-domain. As real-time signal analysis is required for fast processing, several recursive algorithms were proposed to perform the calculation with overlapping sequences in a sliding manner. One Sliding DFT (SDFT) method is the Hopping DFT (HDFT), where the DFT calculations are not evaluated sample-by-sample but with longer steps, thus further reducing the computational complexity compared to the other SDFT algorithms. This letter analyses the effect of fixed-point roundoff error in the HDFT algorithm, including the Updating Vector Transform (UVT) block. A closed-form expression for the resulting quantization noise power at the output of the HDFT algorithm is provided, which is validated through simulations. The results show that the roundoff error can be determined based on the number and size of the hops, the window size, and the number of fractional bits used in the quantization process. LA - English DB - MTMT ER - TY - JOUR AU - Alrwashdeh, Monther AU - Csuka, Barna AU - Kollár, Zsolt TI - Quantization Noise Analysis in FBMC Receivers and its Effect on the BER Performance JF - DIGITAL SIGNAL PROCESSING J2 - DIGIT SIGNAL PROCESS VL - 140 PY - 2023 SP - 1 EP - 9 PG - 9 SN - 1051-2004 DO - 10.1016/j.dsp.2023.104117 UR - https://m2.mtmt.hu/api/publication/33966545 ID - 33966545 N1 - Export Date: 22 June 2023 CODEN: DSPRE Correspondence Address: Alrwashdeh, M.; Department of Measurement and Information Systems, Műegyetem rkp. 3., Hungary; email: monther@mit.bme.hu LA - English DB - MTMT ER - TY - JOUR AU - Cseppentő, Bence AU - Retzler, András AU - Kollár, Zsolt TI - Optimization of the Crest Factor for Complex-Valued Multisine Signals JF - RADIOENGINEERING J2 - RADIOENGINEERING VL - 32 PY - 2023 IS - 2 SP - 264 EP - 272 PG - 9 SN - 1210-2512 DO - 10.13164/re.2023.0264 UR - https://m2.mtmt.hu/api/publication/33836101 ID - 33836101 N1 - Export Date: 12 June 2023 Correspondence Address: Cseppento, B.; Dept. of Measurement and Information Systems, Muegyetem rkp. 3, Hungary; email: cseppento@mit.bme.hu LA - English DB - MTMT ER - TY - CHAP AU - Hoekstra, J H AU - Cseppentő, Bence AU - Beintema, G I AU - Schouken, M AU - Kollár, Zsolt AU - Tóth, Roland TI - Computationally efficient predictive control based on ANN state-space models T2 - 2023 62nd IEEE Conference on Decision and Control (CDC) PB - IEEE CY - Piscataway (NJ) SN - 9798350301236 PY - 2023 SP - 6336 EP - 6341 PG - 6 DO - 10.1109/CDC49753.2023.10383724 UR - https://m2.mtmt.hu/api/publication/34508934 ID - 34508934 N1 - East China University of Science and Technology; et al.; MathWorks, Harbin Engineering University; Nanjing University of Information Science and Technology; Shandong University of Science and Technology; Shanghai Jiaotong Univerity University of Technology, Control Systems Group, Dept. of Electrical Engineering, Eindhoven, Netherlands Budapest University of Technology and Economics, Dept. of Measurement and Information Systems, Hungary Institute for Computer Science and Control, Budapest, Hungary Conference code: 196803 Export Date: 23 February 2024 CODEN: PCDCD Correspondence Address: Cseppento, B.; Budapest University of Technology and Economics, Hungary; email: cseppento@mit.bme.hu LA - English DB - MTMT ER - TY - CONF AU - Retzler, András AU - Tóth, Roland AU - Beintema, Gerben Izaak AU - Noël, Jean-Philippe AU - Schoukens, Maarten AU - Weigand, Jonas AU - Kollár, Zsolt AU - Swevers, Jan TI - Identifying a simulation model of an industrial robot T2 - 7th Edition of the Workshop on Nonlinear System Identification Benchmarks PY - 2023 UR - https://m2.mtmt.hu/api/publication/34401007 ID - 34401007 LA - English DB - MTMT ER - TY - CONF AU - Retzler, András AU - Tóth, Roland AU - Swevers, Jan AU - Noël, Jean-Philippe AU - Kollár, Zsolt AU - Beintema, Gerben Izaak AU - Weigand, Jonas AU - Maarten, Schoukens TI - Augmented model identification for forward simulation of a robot arm T2 - Benelux Meeting on Systems and Control 2023 PY - 2023 UR - https://m2.mtmt.hu/api/publication/34400992 ID - 34400992 LA - English DB - MTMT ER - TY - JOUR AU - Ahmed, Abu Shakil AU - Al-Amaireh, Husam AU - Kollár, Zsolt TI - Multicarrier Modulation Schemes for 5G Wireless Access JF - ECTI Transactions on Computer and Information Technology VL - 16 PY - 2022 IS - 4 SP - 378 EP - 392 PG - 15 SN - 2286-9131 DO - 10.37936/ecti-cit.2022164.248710 UR - https://m2.mtmt.hu/api/publication/33114821 ID - 33114821 N1 - Export Date: 8 November 2022 Correspondence Address: Ahmed, A.S.; University College DublinIreland; email: shakil.ahmed.bd71@gmail.com AB - The 5G wireless access technology will supersede its predecessor, 4G, in the current decade, at first coexisting with it and later as a standalone technology. This work examines and compares the performance of the following orthogonal multicarrier schemes: Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM), Windowed Orthogonal Frequency Division Multiplexing (W-OFDM), Filtered Orthogonal Frequency Division Multiplexing (F-OFDM), Universal Filtered Multi-Carrier (UFMC), and Filter Bank Multi-Carrier (FBMC). The system architecture of each scheme is investigated while considering the performance in fading channel models. The simulation was performed using a standard set of parameters, and the performance was appraised based on Power Spectral Density (PSD), Peak to Average Power Ratio (PAPR), Complementary Cumulative Distribution Function (CCDF) of PAPR, Bit Error Rate (BER), and Signal to Noise Ratio (SNR). In addition, a comprehensive analysis is presented concerning filter or window implementation, filtering method, orthogonality, roll-off rate, spectral leakage, spectral efficiency, computational complexity, and runtime complexity. Based on the results, each scheme has its advantages and disadvantages compared with the other methods. FBMC, F-OFDM, and W-OFDM are preferred for better spectrum utilization, transmission accuracy, and power efficiency, respectively. UFMC offers a fine balance between these multicarrier schemes. Therefore, the modulation scheme for the future physical layer will strongly depend on the requirements. LA - English DB - MTMT ER - TY - JOUR AU - Al-Amaireh, Husam AU - Kollár, Zsolt TI - Low complexity PPN-FBMC Receivers with improved sliding window equalizers JF - PHYSICAL COMMUNICATION J2 - PHYS COMMUN VL - 54 PY - 2022 IS - October PG - 9 SN - 1874-4907 DO - 10.1016/j.phycom.2022.101795 UR - https://m2.mtmt.hu/api/publication/32925083 ID - 32925083 N1 - Export Date: 28 July 2022 Correspondence Address: Al-Amaireh, H.; Budapest University of Technology and Economics, Műegyetem rkp. 3., Hungary; email: husam.al-amaireh@edu.bme.hu AB - Bandwidth and latency in future 5G and beyond multiple access systems are two extremely important metrics for which the requirements are very strict. Filter Bank Multi-Carrier (FBMC) is a promising scheme that can satisfy many future requirements due to its advantageous spectral characteristics. However, the required computational complexity is one of its major drawbacks. In this paper, we propose two improved receiver structures for the PolyPhase Network (PPN) based FBMC receivers. These improved structures reduce the complexity of the receivers to almost half of the conventional PPN receivers taking advantage of the real valued signal processing. We also investigate the Sliding Window (SW) equalizer technique to enable the implementation of the proposed structures in multipath environments. Furthermore, we propose two modifications to the SW equalization method. First, by using the Hopping Discrete Fourier Transform (HDFT) the complexity requirements can be reduced. Second, by applying overlapped windows the overall system performance in terms of bit error rate can be improved. LA - English DB - MTMT ER - TY - JOUR AU - Alrwashdeh, Monther AU - Kollár, Zsolt TI - Analysis of quantization noise in FBMC transmitters JF - DIGITAL SIGNAL PROCESSING J2 - DIGIT SIGNAL PROCESS VL - 131 PY - 2022 PG - 11 SN - 1051-2004 DO - 10.1016/j.dsp.2022.103760 UR - https://m2.mtmt.hu/api/publication/33120308 ID - 33120308 N1 - Export Date: 18 October 2022 CODEN: DSPRE Correspondence Address: Alrwashdeh, M.; Department of Measurement and Information Systems, Műegyetem rkp. 3., Hungary; email: monther@mit.bme.hu AB - This paper investigates Filter Bank MultiCarrier (FBMC) modulation implemented with frequency spreading and polyphase network-based in terms of the introduced quantization noise. As FBMC is considered one of the future candidates for 5G/6G communication systems due to its advantageous spectral properties, the introduced quantization noise in the implementation is an essential design criterion. Analytical expressions for fixed- and floating-point Quantization Noise Power (QNP) in FBMC transmitter schemes are given. Based on the results, it can be stated that the total QNP depends on the number of carriers, overlapping symbols, and the resolution of the quantizer. The results are verified through simulations. Estimating the quantization noise in FBMC systems in the function of the selected bit resolution and keeping it at an acceptable level is an essential design step. The results can be directly employed in the preliminary hardware design of FBMC transmitters, where the choice of the arithmetical units and the bit resolution is a key factor. LA - English DB - MTMT ER - TY - CHAP AU - Alrwashdeh, Monther AU - Kollár, Zsolt TI - Analysis of Fixed-Point Quantization Noise in Multicarrier Transmitter Schemes T2 - 2022 32nd International Conference Radioelektronika (RADIOELEKTRONIKA) PB - IEEE CY - Piscataway (NJ) SN - 9781728186863 PY - 2022 SP - 180 EP - 184 PG - 5 DO - 10.1109/RADIOELEKTRONIKA54537.2022.9764932 UR - https://m2.mtmt.hu/api/publication/32805397 ID - 32805397 N1 - Crayonic Secure Digital Identity; et al.; Fakulta Elektrotechniky a Informatiky; IEEE Czechoslovakia Section; Micronix; SES Conference code: 179104 Export Date: 17 June 2022 AB - In this paper we investigate the effect of quantization in MultiCarrier (MC) transmitters which use an IFFT block. Three MC modulations are considered: Orthogonal Frequency Division Multiplexing (OFDM), Filter Bank MultiCarrier (FBMC) with PolyPhase Network (PPN) implementation (FBMC-PPN), and FBMC with Frequency Spreading (FS) implementation (FBMC-FS). The Quantization Noise Power (QNP) in the case of fixed-point implementation at the output of the three transmitters are expressed analytically and verified through simulation. The results show that the OFDM transmitter has the lowest QNP, while the FBMC-FS transmitter has the highest QNP in the case of fixed-point arithmetic. LA - English DB - MTMT ER -