Error rate performance of Hybrid QAM-FSK in OFDM systems exhibiting low PAPR

Latif, Asma; Gohar, N.D.

doi:10.1007/s11432-009-0165-y

Cited by 7 publications

(2 citation statements)

References 11 publications

(15 reference statements)

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“…This alphabet is a generalization of the modulation presented in [31]. The hybridization of FSK modulation and a linear modulation was also presented in [32][33][34][35], but no channel coding was considered. The work [36] considered the use of binary and multidimensional TCs associated with a hybrid FSK and QAM modulation.…”

Section: Orthogonal With Coplanar Subsets Modulationmentioning

confidence: 99%

Coplanar Turbo‐FSK: A Flexible and Power Efficient Modulation for the Internet‐of‐Things

Roth

Doré

Ros

et al. 2018

Wireless Communications and Mobile Computing

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As the Internet-of-Things (IoT) has expanded, multiple solutions have attempted to address the issues of the Low Power Wide Area (LPWA) networks physical layer. In a previous work, we proposed the Turbo-FSK, a constant envelope modulation with orthogonal alphabet that allows the receiver to operate at very low levels of power (high sensitivity performance) and very low levels of energy per bit . The scheme was demonstrated to approach Shannon's limit as close as 0.29 dB. However, the scheme lacks flexibility in terms of spectral efficiency (always lower than 10 −1 bits/s/Hz), especially compared to the recently standardized Narrow-Band IoT (NB-IoT) solution. In this work, we propose an evolution of the initial scheme, so-called Coplanar Turbo-FSK (C-TFSK). In order to increase the spectral efficiency of the system, two new features are introduced: a modulation combining linear and orthogonal properties where only subsets of the alphabet are orthogonal and a puncturing mechanism. Several aspects of the scheme are then studied under asymptotic hypothesis, such as the influence of the linear component of the alphabet and the effects of puncturing. The high flexibility in terms of spectral efficiency, the short distance to Shannon's limit, and the constant envelope property make the C-TFSK a serious contender for the physical layer of the IoT.

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Section: Orthogonal With Coplanar Subsets Modulationmentioning

confidence: 99%

Coplanar Turbo‐FSK: A Flexible and Power Efficient Modulation for the Internet‐of‐Things

Roth

Doré

Ros

et al. 2018

Wireless Communications and Mobile Computing

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“…If the Turbo-FSK scheme can be easily integrated in an OFDM framework thanks to its use of the FSK (which can be implemented using the fast Fourier transform (FFT) algorithm), it nonetheless lacks the flexibility offered by the NB-IoT solution. An interesting option is therefore to associate this technique with alphabet hybridation [16][17][18][19], which will improve the flexibility of the scheme. This hybridation of the FSK modulation, so-called Coplanar FSK [20], can be done while maintaining the constant envelope property, which gives a significant advantage to the Turbo-FSK technique.…”

Section: Introductionmentioning

confidence: 99%

Contender waveforms for Low-Power Wide-Area networks in a scheduled 4G OFDM framework

Roth

Doré

Ros

et al. 2018

EURASIP J. Adv. Signal Process.

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When designing new solutions for Low-Power Wide-Area (LPWA) networks, coexistence and integration into existing 4G frameworks should be considered to ease the deployment procedure and reduce costs. In a previous work, Turbo-FSK was proposed as a potential physical layer for LPWA networks. With its constant envelope and high energy efficiency, the scheme is a serious contender for this type of networks. We propose to study the system in the Orthogonal Frequency Division Multiplexing (OFDM) framework, currently used by existing cellular networks and also considered for the recently standardized Narrow-Band IoT (NB-IoT). Several extensions of the Turbo-FSK scheme are presented. A hybrid modulation alphabet, combining orthogonal with linear modulations, is introduced, and the substitution of Frequency Shift Keying (FSK) modulation for another orthogonal modulation based on Zadoff-Chu (ZC) sequences is considered. Simulations are run under various conditions including Rayleigh fading channel with mobility, demonstrating that the Turbo-FSK scheme is able to achieve performance close to the Turbo Coded Orthogonal Frequency Division Multiplexing (TC-OFDM) when a low rate is considered. When considering hybridation of the alphabet, limitations appear for higher data rate, which can be overcome by changing the orthogonal alphabet. The study of the variation of the envelope of the compared solutions emphasizes the crucial trade-off between performance and efficiency of the power amplifier (PA), a main concern for low-power applications. While using the proposed solutions, we demonstrate that energy consumption can be reduced by up to a factor of 2.5.

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Hardware Realization of GFSK-Based Bluetooth Modem

Mohamed

2021

Bluetooth 5.0 Modem Design for IoT Devices

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Error rate performance of Hybrid QAM-FSK in OFDM systems exhibiting low PAPR

Cited by 7 publications

References 11 publications

Coplanar Turbo‐FSK: A Flexible and Power Efficient Modulation for the Internet‐of‐Things

Coplanar Turbo‐FSK: A Flexible and Power Efficient Modulation for the Internet‐of‐Things

Contender waveforms for Low-Power Wide-Area networks in a scheduled 4G OFDM framework

Hardware Realization of GFSK-Based Bluetooth Modem

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