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In this contribution we perform a review of some recent developments and important results on Filter Bank based Multicarrier (FBMC) systems and make a comparison with Cyclic Prefix (CP) based OFDM. We first give an overview of the system structure and show how the subcarriers are generated. Then the spectral and peakto- average power ratio (PAPR) b...
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Citations
... The FBMC modulation has been well studied and many works present new FBMC-based modulation formats for utilization in optical wireless communications for reaching even higher spectral efficiency. In [2], the performance of FBMC and cyclic prefix based orthogonal frequency division multiplexing (OFDM) systems in the same bandwidth and providing the same throughput is compared by showing some bit error rate (BER) simulation results. In [3], carrier phase recovery problems are addressed by minimizing maximum likelihood and maximum posteriori criterions. ...
... Research conducted by Leonardo G. Baltar and Josef A. Nossek discusses the review of FBMC and makes a comparison with OFDM based on Cyclic Prefix (CP) then performs spectral measurements and Peak to Average Power Ratio (PAPR). This study discusses the subcarrier model used in the derivation of the channel-per-subcarrier equalizer found in the recent literature and presents a new method of per-subcarrier channel estimation based on the same model [16]. The research method is carried out by comparing the performance of FBMC and CP-OFDM by showing several BER simulation results, when both systems occupy the same bandwidth and the results are the same. ...
The 5G NR network planning covers the types of use scenarios and applications that include Enhanced Mobile Broadband (eMBB), Ultra-Reliable and Low Latency Communications (URLLC), and Massive Machine Type Communications (MTC). Regarding multicarrier modulation schemes, Orthogonal Frequency Division Multiplexing (OFDM) has become the most popular choice in previous technology, so OFDM is a strong candidate for its 5G NR technology application. However, OFDM has disadvantages such as higher PAPR and decreased bandwidth efficiency due to the addition of CP. These weaknesses can be overcome by the FBMC modulation scheme with Offset Quadrature Amplitude Modulation (OQAM) as a more efficient CP replacement for its implementation in 5G NR. This study analyzed the development of OQAM in Filter Bank multicarrier (FBMC) and compared it with using Cyclic Prefix (CP) based on OFDM using the AWGN channel. The first step of this research is to present an overview of the modulation scheme used. Next, compare the performance of FBMC-OQAM and CP-OFDM by analyzing several Bit Error Rate (BER) simulation results against the SNR value when both systems use the same simulation parameters. Based on the test results of each BER, both methods have different values, almost 2 dB for the same BER results. It indicates that the FBMC-OQAM system reached the BER value of 10-4 at SNR 15 dB. The CP-OFDM system, meanwhile, was able to achieve a BER value of 10-4 at SNR 17 dB. These results indicate that the FBMC-OQAM system is superior to CP-OFDM based on the BER values.
... We can see that the effects of the simulation are much similar to the theoretical predictions. Compared to the simulation results of cyclic prefix-OFDM and coded FBMC-OQAM [27,28], the proposed FBMC with OQAM gives an improved bit error rate. The presence of errors in the synchronization of frequencies affects the orthogonality between the subcarriers, resulting in the loss of the output of the device. ...
... In multi-carrier FDM the data of the user can be separated into multiple sub-stream and transmit them in parallel, to make the data rate high. While OFDM the sub-carriers are designed to be orthogonal, these allows sub-carriers to overlap and saved Bandwidth, that make data rate higher [1]. In OFDM the carriers are all generated by single transmitter in a special way that allow them to be tight much closer together and spend a much wider Bandwidth that means we can reduce or eliminate Guard-Band. ...
Orthogonal Frequency Division Multiplexing (OFDM) is used to enhance Bit Error Rates (BER) performance for error free transmission in free space in free pace. OFDM-based systems operate in the hostile multipath radio environment, which allows efficient sharing of limited resources. This research work was designed, developed and simulated an FFT-OFDM based System using the basic blocks of Simulink in MATLAB/Simulink software, to enhance BER for error free transmission. The system was design using Fast Fourier transform (FFT) and Inverse Fast Fourier transform (IFFT). This was achieved in backing of collection and review of high-quality research papers, which reported the latest research developments in OFDM communications networks, and its applications in future wireless systems. The research mitigated the noise enhancement effect. And many critical problems associated with the error transmission in wireless communication networks in the future. An error transmission in wireless systems is global issues and challenges that are still looking for efficient solutions. This research work would overcome the global issues and challenges facing the wireless communication network.
... To improve the spectral efficiency and latency of RPSDM, filtering methods like FBMC are needed. However, RPSDM provides low PAPR and computational efficiency compared to conventional FBMC [29], [30]. It is seen that the PAPR of FBMC [29] for N = 64 subcarriers with CCDF probability of 10 −3 is around 16 dB which is much higher than OFDM (around 10 dB), whereas it is 8dB for RPSDM. ...
... Table IItabulates the worst case PAPR performance of OFDM(30) and RPSDM (31) respectively. As ...
... Worst case comparison of PAPR in (dB) it is evident from(30) that if N is some integer power of 2 (2 mp = 8, 16, . . . 512) then PAPR increases by 3dB for every increment of m p by 1. Whereas worst case PAPR of RPSDM is not growing exactly at the same rate as that of OFDM. ...
In this paper, a new modulation method defined as Ramanujan Periodic Subspace Division Multiplexing (RPSDM) is proposed
using Ramanujan subspaces. Each subspace contains an integer valued Ramanujan Sum (RS) and its circular downshifts as a
basis. The proposed RPSDM decomposes the linear time-invariant wireless channels into a Toeplitz stair block diagonal matrices,
whereas Orthogonal Frequency Division Multiplexing (OFDM) decompose the same into diagonal. Advantages of such structured
subspaces representation are studied and compared with an OFDM representation in terms of Peak-Average Power Ratio (PAPR)
and Bit-Error-Rate (BER). Zero Forcing (ZF) and Minimum Mean Square Error (MMSE) detectors are applied to evaluate the
performance of OFDM and RPSDM techniques. Finally, the simulation results show that the proposed design (with an additional
receiver complexity) outperforms OFDM under both detectors.
... But in multicarrier (OFDM) the spectrum used is divided into narrow subbands and then separate data is transmitted in each band using different carriers. Power and rate of transmission in a different band depend on the responds of the channel in that band, and there is no ISI since in each narrow sub-band the channel responds are almost flat (Baltar and Nossek (2012). The first product profiles for mobile WiMAX have yet to be chosen as the standard is not yet approved, OFDM is the very key modern multi-carrier wireless technology forms the basis for 4G (fourth generation) wireless communication system in LT and WiMAX (LaSorte, Barnes and Refai, (2008). ...
... In the OFDM the sub-carriers are designed to be orthogonal, these allows sub-carriers to overlap and saved Bandwidth, that make data rate higher (Baltar and Nossek (2012). In OFDM the carriers are all generated by single transmitter in a special way that allow them to be tight much closer together and spend a much wider Bandwidth that means we can reduce or eliminate Guard-Band. ...
Orthogonal Frequency Division Multiplexing (OFDM) is used to achieve multi-carrier signals and high- Speed data rate in free space. OFDM-based systems operate in the hostile multipath radio environment, which allows efficient sharing of limited resources. This research work was designed, developed and simulated an OFDM System using the basic blocks of Simulink in MATLAB/Simulink software, to support multi-carrier, high-speed data rates. This was achieved in backing of collection and review of high-quality research papers, which reported the latest research developments in OFDM communications networks, and its applications in future wireless systems. The research work significantly increases the speed of data rate signals, and many critical problems associated with the applications of OFDM technologies in future wireless systems are still looking for efficient solutions. This would overcome the global issues and challenges facing the limited bandwidth in wireless communication network.
... To improve the spectral efficiency and latency of RPSDM, filtering methods like FBMC are needed. However, RPSDM provides low PAPR and computational efficiency compared to conventional FBMC [29], [30]. It is seen that the PAPR of FBMC [29] for N = 64 subcarriers with CCDF probability of 10 −3 is around 16 dB which is much higher than OFDM (around 10 dB), whereas it is 8dB for RPSDM. ...
... Table IItabulates the worst case PAPR performance of OFDM(30) and RPSDM (31) respectively. As ...
... Worst case comparison of PAPR in (dB) it is evident from(30) that if N is some integer power of 2 (2 mp = 8, 16, . . . 512) then PAPR increases by 3dB for every increment of m p by 1. Whereas worst case PAPR of RPSDM is not growing exactly at the same rate as that of OFDM. ...
In this paper, a new modulation method defined as Ramanujan Periodic Subspace Division Multiplexing (RPSDM) is proposed using Ramanujan subspaces. Each subspace contains an integer valued Ramanujan Sum (RS) and its circular downshifts as a basis. The proposed RPSDM decomposes the linear time-invariant wireless channels into a Toeplitz stair block diagonal matrices, whereas Orthogonal Frequency Division Multiplexing (OFDM) decompose the same into diagonal. Advantages of such structured subspaces representation are studied and compared with an OFDM representation in terms of Peak-Average Power Ratio (PAPR) and Bit-Error-Rate (BER). Zero Forcing (ZF) and Minimum Mean Square Error (MMSE) detectors are applied to evaluate the performance of OFDM and RPSDM techniques. Finally, the simulation results show that the proposed design (with an additional receiver complexity) outperforms OFDM under both detectors.
... Most of the aforementioned works belong to the type of space-time block coding (STBC) schemes, that is, the Alamouti code is encoded over adjacent symbols. However, an OQAM-OFDM symbol is interfered by multiple neighboring symbols in the time domain, because of the large filter length [18,19]. Hence, quite more additional resources are required to deal with the interference in most of the aforementioned works, resulting in a low-spectral efficiency. ...
Offset quadrature amplitude modulation-based orthogonal frequency division multiplexing (OFDM) systems cannot be directly combined with the Alamouti code because of the intrinsic imaginary interference. In this paper, we propose a block-wise space-frequency block coding (SFBC) scheme and a block-wise space-time block coding (STBC) scheme for offset quadrature amplitude modulation-based OFDM systems, which achieve bit error rate performances that are close to OFDM systems. The proposed schemes satisfy the orthogonality condition of the Alamouti code in the complex field with guard band/intervals. To improve the spectral efficiency of the block-wise SFBC scheme, we also consider the case without the guard band. It is observed that only the two innermost subcarriers do not satisfy the complex orthogonality condition when the guard band is removed. Then, a simple equalization scheme is proposed to independently equalize the two innermost subcarriers. Simulation results show that the block-wise SFBC scheme works well under channels with mild-to-moderate frequency selectivity, and the block-wise (STBC ) scheme suffers less than 1 dB loss under severe frequency selective channels at the bit error rate of 10- 3, when only a simple one tap zero-forcing equalizer is employed.
... The big question now is whether OFDM will be able to keep the pace with the growing needs of the world by increasing its transmission rates and outperforming new competitors such as filter bank multicarrier (FBMC) schemes [7], [8], or some already well-known techniques such as CDMA, partial block multi carrier CDMA (PB/MC-CDMA) [9], time-division multiple access (TDMA), frequency division multiple access (FDMA), among others. This paper has the following organization. ...
Orthogonal frequency division multiplexing
(OFDM) is not only a simple scheme used as a digital multicarrier
modulation method, but it is one of the most popular
and effective technologies used in nowadays communication
systems. In this work we present a brief summary of the
history of OFDM, a description of the key features of this
technology is delivered, and with it we argue why OFDM has
been the fundamental scheme of many communication systems
for the past and current years. At the same time, we verify the
continuity of OFDM in future applications, and how it clearly
outperforms other similar technologies.
... Furthermore, FBMC/OQAM systems are more efficient in the presence of highly frequency selective channels compared with CP-OFDM. This comes at the price of slightly higher computational complexity [3], [4]. ...
... The channel impulse response is L ch = 169 taps. With these system configurations, especially due to L ch = 169 and the highly frequency selective channel, a CP-OFDM system would have required a CP with a minimum length of 168 taps [3], [4]. This limits the data-throughput of the CP-OFDM to more than 50%, therefore we do not include a direct comparison in the simulation results. ...
