On the Road to 5G: Comparative Study of Physical Layer in MTC Context

Medjahdi, Yahia; Traverso, Sylvain; Gerzaguet, Robin; Shaïek, Hmaied; Zayani, Rafik; Demmer, David; Zakaria, Rostom; Doré, Jean‐Baptiste; Mabrouk, M.; Ruyet, Didier Le; Louët, Yves; Roviras, Daniel

doi:10.1109/access.2017.2774002

Cited by 64 publications

(32 citation statements)

References 53 publications

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“…The analytical expression of the spectral efficiency is the same for the two proposed waveforms. Assuming, N s the number of transmitted symbols, M a the number of active filter bank carriers, r the modulation efficiency (including both the modulation order and the coding rate), the spectral efficiency can be expressed as follows [23] [27]:…”

Section: N δ = 1024 (25)mentioning

confidence: 99%

“…It implies that (27) must be satisfied so as to ensure the LTE symbol density. As N CP is an integer number, the minimum value of N that still satisfies (27) is 128 (with N CP = 9).…”

Section: N δ = 1024 (25)mentioning

confidence: 99%

“…= 1024 1024 + 72 (27) As a consequence, if the typical rate factor δ = 1/2 is considered then M = 16. In other words, there would be 16 subbands of 960 kHz.…”

Section: N N + N Cpmentioning

confidence: 99%

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Study of OFDM Precoded Filter-Bank Waveforms

Demmer

Zakaria

Gerzaguet³

et al. 2019

IEEE Trans. Wireless Commun.

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Forthcoming wireless systems will have to cope with a heterogeneous and dense traffic. High demands in terms of bandwidth use efficiency and increased flexibility are therefore required for the related air-interface technology. In this context, Filter-Bank MultiCarrier with Offset QAM (FBMC/OQAM) waveform has been recognized as an enabling technology providing strong assets with a well confined spectrum and enhanced spectral efficiency with respect to Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM). Nonetheless, FBMC-OQAM presents a few challenges to overcome: the intrinsic interference must be taken into consideration in the channel estimation processes and multiple antenna schemes design. Those challenges are induced by the reduction of the orthogonality property to the real field. In this paper, OFDM precoding/decoding is proposed as an alternative to the OQAM signaling for filter-bank based waveforms. The OFDM precoding makes the waveforms near-complex orthogonal which enables a straightforward adaptation to channel estimation techniques and MIMO scheme design. Two waveforms based on this precoding, namely Fast Fourier Transform FBMC (FFT-FBMC) and Block Filtered OFDM (BF-OFDM), have been proposed. A common framework is proposed to study the two waveforms. The paper also investigates changing the time structure of the transmitted signal by introducing the rate factor parameter. It is shown that intrinsic interference can be greatly reduced at the price of a slight side-lobe increase.

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Section: N δ = 1024 (25)mentioning

confidence: 99%

“…It implies that (27) must be satisfied so as to ensure the LTE symbol density. As N CP is an integer number, the minimum value of N that still satisfies (27) is 128 (with N CP = 9).…”

Section: N δ = 1024 (25)mentioning

confidence: 99%

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Study of OFDM Precoded Filter-Bank Waveforms

Demmer

Zakaria

Gerzaguet³

et al. 2019

IEEE Trans. Wireless Commun.

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“…Moreover, the significant spectral leakage of OFDM will induce severe adjacent channel interference. In 5G networks, more flexible 5G waveforms [32] are required to overcome the upcoming challenges, e.g., FBMC [33][34][35], generalized frequency division multiplexing (GFDM) [36], and universal filtered multi-carrier (UFMC) [37]. Most of the existing RA algorithms only take either OFDM [14][15][16] or OFDM/FBMC [12,20,38] into account, and it still needs to make a thorough inquiry of the specific influence about different waveforms.…”

Section: Contributionsmentioning

confidence: 99%

Energy-efficient multi-cell resource allocation in cognitive radio-enabled 5G systems

Yan

et al. 2019

EURASIP J. Adv. Signal Process.

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In this paper, we propose an energy-efficient resource allocation (RA) algorithm in cognitive radio-enabled 5th generation (5G) systems, where the scenario including one primary system and multiple secondary cells is considered. Because of the high spectrum leakage of traditional orthogonal frequency division multiplexing (OFDM), alternative modulation schemes regarded as the potential air interfaces in 5G are analyzed, e.g., filter bank-based multi-carrier (FBMC), generalized frequency division multiplexing (GFDM), and universal filtered multi-carrier (UFMC). Our objective is to maximize the whole energy efficiency of secondary system defined by the ratio of the capacity to the total power consumption subject to some practical constraints. The general formulation leads to a non-convex mixed-integer nonlinear programming problem with fractional structure, which is challenging to solve due to its intractability and significant complexity. Therefore, we resort to an alternate optimization framework to optimize the variables of subcarrier assignment and power allocation, where successive convex approximation (SCA) is employed so that the general formulation is finally transformed into a solvable convex problem. Numerical results validate the effectiveness of the proposed RA algorithm, and the comparison with some existing RA algorithms is conducted. In addition, the performance of using different 5G candidate waveforms in the energy-efficient RA algorithm is also presented and discussed.

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“…Among these waveforms, UFMC is a promising choice as per subband filtering which is performed to trade off the out-of-band emission and complexity performance. When comparing with FBMC, UFMC is better in case of short packet length [13] and has only slightly worth out-ofband emission for large packet size [9,14]. In addition, it has much better compatibility to multiantenna system than FBMC system.…”

Section: Introductionmentioning

confidence: 99%

FPGA Implementation of UFMC Based Baseband Transmitter: Case Study for LTE 10MHz Channelization

Jafri

Majid

Zhang

et al. 2018

Wireless Communications and Mobile Computing

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Universal filtered multicarrier (UFMC) is a low complexity promising waveform that provides quasi-orthogonal property among subcarriers. In addition, it can achieve much better out-of-band emission performance than orthogonal frequency division multiplexing (OFDM) system. Authors have proposed a hardware platform to implement a UFMC transmitter in this paper. Highly reduced complexity schemes for IFFT, filtering, and spectrum shifting are realized on actual hardware. This helps to achieve overall architecture of the transmitter at the cost of minimal FPGA resource usage. Hence, the overall design uses only 1038 slice registers, 1154 slice LUTs, and 64 multipliers of Xilinx Virtex-7 XC7VX330t device. A throughput of 773.5 Msamples/sec at an operational frequency of 364 MHz is achieved. This throughput is adequate for processing 50 Physical Resource Blocks (PRB) of LTE 10 MHz channelization in required time. The presented architecture provides a latency of only 2% of one LTE 10MHz channelization symbol due to the implementation of pipelining at different levels. Although the presented hardware design in its current form meets LTE 10MHz channelization throughput requirements, further increase in throughput is possible due to the scalable nature of the architecture. To the best of our knowledge, this work is first ever FPGA solution for UFMC transmitter presented in the literature.

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On the Road to 5G: Comparative Study of Physical Layer in MTC Context

Cited by 64 publications

References 53 publications

Study of OFDM Precoded Filter-Bank Waveforms

Study of OFDM Precoded Filter-Bank Waveforms

Energy-efficient multi-cell resource allocation in cognitive radio-enabled 5G systems

FPGA Implementation of UFMC Based Baseband Transmitter: Case Study for LTE 10MHz Channelization

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