F-OFDM in a novel form for analyzing 5G networks (original) (raw)
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Filtered-OFDM for 5G Wireless Communication Narrow-band IoT Systems
The emerging Internet of Things (IoT) technology, devices will make the next generation 5G systems enable to support in diversify demands with greater efficiency in social, technical and economic dimensions. The era of 5G communication has empowered us with higher data transmission rate, user-friendly environment and better resource utilization capabilities equipped within it. In order to achieve these 5G technology attribute, we need to have small data packets and narrow bands with low power consumption. Hence, narrow-band IoT (NB-IoT) devices may play very vital and important role to fulfil these goals. The standard or conventional Orthogonal Frequency Division Multiplexing (OFDM) suffers with high peak to average ratio (PAPR), high side lobes causing undesired spectral leakage and channel interference. However, spectrally-localized waveform is achieved by using filtered orthogonal frequency division multiplexing (F-OFDM) by setting the filter length larger than the cyclic prefix (CP) length of an OFDM system. In proposed F-OFDM waveform, we can achieve localized frequency spectrum for narrow bandwidths and maintaining the inter-symbol interference/inter-carrier interference (ISI/ICI), BER and PAPR within an acceptable range. The key contribution in this paper is the filtered OFDM (F-OFDM) system performance has been analysed for narrow band IoT with Cyclic Prefix OFDM (CP-OFDM). Analysing the results, it is found that the F-OFDM system has achieved better PAPR than conventional OFDM system with least Bit Error Rate (BER) in the range of 20-40 dB of SNR for 5G supporting IoT systems.
Under Test Filtered-OFDM And UFMC 5g Waveform Using Cellular Network
Journal of Southwest Jiaotong University
In this study, filtered orthogonal frequency division multiplexing (F-OFDM) and universal filtered multicarrier (UFMC) were proposed for complexity reduction in the 5G waveform. Cyclic prefix orthogonal frequency division multiplexing (CP_OFDM) is well suited for 4G; however, the major problem of the 4G modulation methods is their susceptibility to high peak to average power ratio (PAPR). Another problem of OFDM is the issue of sideband leakage. The existing 4G systems mainly depend on the CP_OFDM waveform, which cannot support the host of applications provided by the 5G platform. 5G-generated traffic is likely to exhibit different features and requirements compared to the existing wireless technology. Consequently, investigations have been devoted to other multiple access schemes. The existing limitations of OFDM can be mitigated by using the UFMC technique. To ensure that the demands and requirements of the upcoming 5G cellular networks are satisfied, this study presents an enable...
An Overview of Various Waveform Contenders Based on OFDM for 5G Communication
International Journal of Trend in Scientific Research and Development, 2018
The rollout of fifth generation(5G) wireless communication technology provides high spectral efficiency, high speed, greater density of users, high capacity, pseudo outdoor communication etc. In the year 2020, the data consumption is expected to increase 30% which cannot be supported by the current technologies such as 3G and 4G. The (4G) mobile communication uses Orthogonal Frequency Division Multiplexing (OFDM) technique in various systems like-Wi-MAX. Now as the technology is being advanced to 5G, there are some drawbacks of OFDM like-peak to average power ratio (PAPR), out of band emissions (OOB), and use of cyclic prefix (CP).In this paper, the drawbacks of Ofdm in Lte has been removed using the waveforms contenders like UFMC, FBMC, and GFDM overwhelmingly welcomed for the 5G air interface. applications of 5G are Internet of Things (IoT), Vehicle to Vehicle (V2V) communication, Machine to Any (M2X) communication.
Spectrum analysis of OFDM versus FBMC in 5G mobile communications
TELKOMNIKA, 2023
With the demand for mobile data traffic, multi-carrier transmission techniques are highly attractive for all-new wireless communication systems, which divides data into many components and sends each of these components via a different carrier signal. So far, orthogonal frequency division multiplexing (OFDM) and filter bank multi-carrier (FBMC) techniques are the dominant waveform contenders. A number of studies have been made and failed to give a complete comparison where they did not consider various conditions altogether. Therefore, this paper addresses a complete comparative analysis of OFDM and FBMC, performed based on spectral efficiency, modulation, demodulation, power spectral densities, and peak to average power ratio comparison, all simulated using Matlab and GNU's not unix radio (GNU-radio) software.
Comparison of Various Modulation Technique OFDM, FBMC & UFMC
International Journal of Innovative Research in Technology, 2019
To design a new waveform for 5G communications with a lower peak / average power ratio and a high S pectra Efficiency methods / S tatistical analysis: In this document, orthogonal frequency division multiplexing (OFDM), filter bank Multi-carrier (FBMC) and Universal Multi-Conveyor Filtered (UFMC) are compared and the PAPR of these techniques is analyzed Applying different subcarriers and modulation techniques. Discoveries: S pectral efficiency is poor in OFDM due to presence of a cyclic prefix and efficiency can be improved by FBMC and UFMC. The use of separate filters for individuals. the subcarriers eliminate the cyclic prefix and an increase in the subcarriers further reduces the PAPR. The PAPR varies according to the modulation techniques used. Application / improvements: UFMC is the best waveform technique for 5Gwhen compared to OFDM and FBMC, which will have less PAPR and PAPR is further reduced by applying Optimization techniques
Filtered OFDM Systems, Algorithms, and Performance Analysis for 5G and Beyond
IEEE Transactions on Communications
Filtered orthogonal frequency division multiplexing (F-OFDM) system is a promising waveform for 5G and beyond to enable multi-service system and spectrum efficient network slicing. However, the performance for F-OFDM systems has not been systematically analyzed in literature. In this paper, we first establish a mathematical model for F-OFDM system and derive the conditions to achieve the interference-free one-tap channel equalization. In the practical cases (e.g., insufficient guard interval, asynchronous transmission, etc.), the analytical expressions for inter-symbol-interference (ISI), inter-carrier-interference (ICI) and adjacent-carrier-interference (ACI) are derived, where the last term is considered as one of the key factors for asynchronous transmissions. Based on the framework, an optimal power compensation matrix is derived to make all of the subcarriers having the same ergodic performance. Another key contribution of the paper is that we propose a multi-rate F-OFDM system to enable low complexity low cost communication scenarios such as narrow band Internet of Things (IoT), at the cost of generating intersubband-interference (ISubBI). Low computational complexity algorithms are proposed to cancel the ISubBI. The result shows that the derived analytical expressions match the simulation results, and the proposed ISubBI cancelation algorithms can significantly save the original F-OFDM complexity (up to 100 times) without significant performance loss.
Filtered orthogonal frequency division multiplexing for improved 5G systems
10.11591/eei.v10i4.3119, 2021
Wireless communications became an integrated part of the human life. Fifth generation (5G) is the modern communication which provides enhanced mobile broadband (eMBB), ultra reliable low latency communications (URLLC), and massive machine type communication (mMTC). Thus, 5G have to provide coverage to multi-numerology devices, therefore, modulation and access schemes are suggested in the literature such as cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) and filtered OFDM (f-OFDM). CP-OFDM suffers from the high out of band emission which limited the multi-numerology applications. In f-OFDM, the out of band emission can be suppressed to an accepted extent such that different numerologies can be coexisting. On the other hand, f-OFDM can be more improved by using a proper filtering approach. In this paper three different filters are suggested based windowed-sinc function; Hanning, Hamming, and Blackman. Simulation results show that the proposed filters are promising for high spectral efficiency and out of band emission rejection. Furthermore, the bit error rate, error vector magnitude, and power spectral density are further improved with respect to CP-OFDM scheme but some trade-off is present. Overall, the suggested windowed-sinc filters are outperforming the traditional CP-OFDM. As a conclusion, the suggested windnowed-sinc filters have no limitations on the modulation order or the number of subcarriers utilized in the system.
International journal of engineering & technology, 2018
4G LTE communication system uses OFDM and for resource allocation control channels like PRACH is used. Around 6% bandwidth is getting used for this PRACH procedure and due to OFDM requirement of strict synchronization, short messaging become tedious and cause power wastage due to the control traffic for every message. The main challenge for 5G communications is to handle the transmission of extremely asynchronous data and control traffic in one go. Existing OFDM based systems have the drawback of very sensitive to the time and frequency offsets and in turn results in synchronization errors. To overcome this challenge, it has been adopted a new waveform based on Bi-orthogonal Frequency Division multiplexing (BFDM) which supports the Internet of Things (IoT) sporadic traffic. In this paper, BFDM principles, behaviour of BFDM under various channel conditions, Matlab simulation results pertaining to the performance of BFDM against the existing OFDM are discussed. The simulation results shows that the Symbol Error Rate of the BFDM system is less than the OFDM under time varying fading conditions such as Extended Pedestrian A (EPA), Extended Vehicular A (EVA), Extended Typical Urban(ETU) models.
Comparison of Various Waveform Contenders of 5G Wireless Communication Based on OFDM
International Journal of Trend in Scientific Research and Development, 2018
This paper presents an extensive and fair comparison among the most promising waveform contenders for the 5G air interface which includes-Filtered OFDM, Filter-bank multi carrier (FBMC), universal multi-carrier (UFMC) has been compared with OFDM in terms of spectral efficiency and rate using mat lab. The disadvantages of OFDM have been addressed and it has shown that (fofdm), (UFMC), (FBMC) could be a more effective solution. FBMC is a method for improving out of band (OOB) characteristics by filtering each subcarrier, it is also expected to improve the Inter-Carrier Interference (ICI) characteristics while UFMC is a method for improving OOB characteristics by filtering each block.
Filtered Orthogonal Frequency Division Multiplexing: A Waveform Candidate for 5G
ABSTRACT: The emerging Internet of Things will make the next generation 5G systems to support a broad range of diverse needs with greater efficiency requirements. The new class of services will need a higher data rates, to handle these demands, the lowest layer of the 5G systems must be flexible. Therefore, the waveform will have an important role in offering these new requirements. These new waveforms should enable efficient multiple access in order to handle the requirements of the future wireless communication systems which should have a variety of traffic types. This means that the corresponding required waveforms should be able to handle as much different type of traffic as possible in the same band. This paper presents the filtered orthogonal frequency division multiplexing waveform, it compares it to the original cyclic prefix OFDM applied in the 4G systems today. These new waveforms will be more robust against the time frequency synchronization problem, it has the potential for mixing different traffic specifications, and supports the scenarios of spectrum fragmentation, due to the improvement in the localization of spectrum. As a conclusion, these waveforms have a good potential in synchronicity and orthogonality and they allow us to drop some amount of signaling when supporting a large number of users. In the same time, they support all multiple input and multiple output (MIMO) scenarios and applications. for these reasons, these waveforms will be promising for 5G systems. some simulation results are shown, which demonstrate the potential of this technology.