Analytical Spectral Evaluation of GFDM Systems Over Non-Linear Channels with Memory

Hilario-Tacuri, Alexander; Fortes, José Mauro P.; Sampaio‐Neto, Raimundo

doi:10.1109/latincom.2018.8613243

Cited by 6 publications

(7 citation statements)

References 13 publications

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“…where β denotes the roll-off factor of the raised cosine shaping pulse. The non-linear system is considered of third order with complex coefficients γ 1 = 1 and γ 3 = −0.25 [14] and the frequency response of the two linear time-invariant systems are given bỹ…”

Section: Numerical Resultsmentioning

confidence: 99%

“…The Price's Theorem for complex values [14], [30], states that the relationship between the ACFs of inputs and output signals of a memory-less non-linear system is given by…”

Section: Performance Evaluation a Spectral Analysis: Out-of-banmentioning

confidence: 99%

“…In this work, the spectral analysis is quantified according to the out-of-band emissions (OOB) of the GFDM signal. The OOB is defined as the ratio between the energy that is inside and outside a certain allocated bandwidth B [14], [32].…”

Section: Performance Evaluation a Spectral Analysis: Out-of-banmentioning

confidence: 99%

“…GFDM is a non-orthogonal multicarrier waveform that transmit a data block composed of M sub-symbols and N sub-carrier which are cyclic filtered by a shaping pulse that is shifted into frequency and time domains [10]. Studies on GFDM that can be found in the literature include: Bit Error Rate (BER) analysis in different scenarios [11]- [13], spectral analysis [14]- [16], receiver and filter design [17]- [19], interference mitigation [20], [21], practical implementation [22], [23] among others. Despite the great advantages of this new waveform, due to its multi-carrier nature, the GFDM is highly sensitive to non-linear distortions arising mainly from high-power amplifiers (HPA).…”

Section: Introductionmentioning

confidence: 99%

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Performance Evaluation of Generalized Frequency Division Multiplexing Systems Over Non-Linearities With Memory

et al. 2019

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The fifth generation (5G) of mobile communications systems plans to support different types of applications, where each of these applications may have different requirements. For this reason, the main characteristic of 5G mobile communications systems is the flexibility of their architecture. An interesting proposal that can meet the requirements of these applications is the multi-carrier waveform Generalized Frequency Division Multiplexing (GFDM). However, due to its multi-carrier nature, this new waveform is highly sensitive to non-linear distortions arising mainly from high-power amplifiers (HPA). In addition, the wideband characteristics of multi-carrier signals result in frequency-dependent distortions, typically know as memory effects. This paper presents the development of closed-form analytical expressions that could be used to evaluate the impact of the distortions induced by non-linearities with memory in the outof-band emissions and the bit error rate performance of GFDM-based systems. The resulting analytical expressions are general enough to obtain numerical results for different parameters of the GFDM-based system.

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Section: Numerical Resultsmentioning

confidence: 99%

“…The Price's Theorem for complex values [14], [30], states that the relationship between the ACFs of inputs and output signals of a memory-less non-linear system is given by…”

Section: Performance Evaluation a Spectral Analysis: Out-of-banmentioning

confidence: 99%

Section: Performance Evaluation a Spectral Analysis: Out-of-banmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance Evaluation of Generalized Frequency Division Multiplexing Systems Over Non-Linearities With Memory

et al. 2019

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“…Thus, waveform developers have utilized the filtration either for each orthogonal subcarrier as in the FBMC [12], or for each fixed group of orthogonal subcarriers like in the UFMC [13], or for each flexible group of orthogonal subcarriers as in the F-OFDM [14]. Furthermore, because of the confliction between the employed digital filters and the orthogonal subcarriers, the filtration is applied for each un-orthogonal subcarrier like in the GFDM that has been considered recently for the 5G mobile networks [15]. However, because of removing the orthogonality with the GFDM waveform, the BW efficiency has been influenced severely.…”

Section: Introductionmentioning

confidence: 99%

Upgrading Physical Layer of Multi-Carrier OGFDM Waveform for Improving Wireless Channel Capacity of 5G Mobile Networks and Beyond

Kadhum

2020

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On the brink of sophisticated generations of mobile starting with the fifth-generation (5G) and moving on to the future mobile technologies, the necessity for developing the wireless telecommunications waveform is extremely required. The main reason beyond this is to support the future digital lifestyle that tends principally to maximize wireless channel capacity and number of connected users. In this paper, the upgraded design of the multi-carrier orthogonal generalized frequency division multiplexing (OGFDM) that aims to enlarge the number of mobile subscribers yet sustaining each one with a high transmission capacity is presented, explored, and evaluated. The expanded multi-carrier OGFDM can improve the performance of the future wireless network that targets equally the broad sharing operation (scalability) and elevated transmission rate. From a spectrum perspective, the upgraded OGFDM can manipulate the side effect of the increased number of network subscribers on the transmission bit-rate for each frequency subcarrier. This primarily can be achieved by utilizing the developed OGFDM features, like acceleration ability, filter orthogonality, interference avoidance, subcarrier scalability, and flexible bit loading. Consequently, the introduced OGFDM can supply lower latency, better BW efficiency, higher robustness, wider sharing, and more resilient bit loading than the current waveform. To highlight the main advantages of the proposed OGFDM, the system performance is compared with the initial design of the multicarrier OGFDM side by side with the 5G waveform generalized frequency division multiplexing (GFDM). The experimented results show that by moving from both the conventional OGFDM and GFDM with 4 GHz to the advanced OGFDM with 6 GHz, the gained channel capacity is improved. Because of the efficient use of Hilbert filters and improved rate of sampling acceleration, the upgraded system can gain about 3 dB and 1.5 dB increments in relative to the OGFDM and GFDM respectively. This, as a result, can maximize mainly the overall channel capacity of the enhanced OGFDM, which in turn can raise the bit-rate of each user in the mobile network. In addition, by employing the OGFDM with the dual oversampling, the achieved channel capacity in worst transmission condition is increased to around six and twelve times relative to the OGFDM and GFDM with the normal oversampling. Furthermore, applying the promoted OGFDM with the adaptive modulation comes up with maximizing the overall channel capacity up to around 1.66 dB and 3.32 dB compared to the initial OGFDM and GFDM respectively. A MATLAB simulation is applied to evaluate the transmission performance in terms of the channel capacity and the bit error rate (BER) in an electrical back-to-back wireless transmission system.

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A Closed-Form Spectral Analysis of GFDM in Underwater Communication Systems

Hilario-Tacuri

2019

2019 IEEE Latin-American Conference on Communications (LATINCOM)

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Analytical Spectral Evaluation of GFDM Systems Over Non-Linear Channels with Memory

Cited by 6 publications

References 13 publications

Performance Evaluation of Generalized Frequency Division Multiplexing Systems Over Non-Linearities With Memory

Performance Evaluation of Generalized Frequency Division Multiplexing Systems Over Non-Linearities With Memory

Upgrading Physical Layer of Multi-Carrier OGFDM Waveform for Improving Wireless Channel Capacity of 5G Mobile Networks and Beyond

A Closed-Form Spectral Analysis of GFDM in Underwater Communication Systems

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