Spectrally Efficient OFDMA Lattice Structure via Toroidal Waveforms on the Time-Frequency Plane

Aldırmaz, Sultan; Serbes, Ahmet; Durak–Ata, Lütfiye

doi:10.1155/2010/684097

Cited by 14 publications

(7 citation statements)

References 12 publications

(16 reference statements)

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“…Consequently, the data rate that can be delivered in this structure would increase and could reach N p times. Multiple orthogonal Hermite-Gaussian carriers were used with rectangular OFDMA in order to increase the bandwidth efficiency [14]. Pulse superposition approach was also applied to generalized orthogonal frequency division multiplexing (GFDM) [15], and the obtained bandwidth efficiency of superimposed GFDM waveform is almost 2.4 much higher than GFDM with Gaussian pulses [16].…”

Section: Fifth Generation Network Should Address An Increasinglymentioning

confidence: 99%

“…It should be noted that two-dimensional differential demodulation is possible in time and frequency direction without changing the transmitter [18]. The remaining modulation options of OFDM have 3-D representation of signal plane classified depending on the type of third dimension which includes index-based [19], number-based [13], and shape-based [14] OFDM modulation schemes. Different domains, such as temporal, frequency, spatial, code, 1 Notation: Bold, lowercase and capital letters are used for column vectors and matrices, respectively.…”

Section: Basic System Modelmentioning

confidence: 99%

“…In OFDM-PSM modulation scheme [14], each one of orthogonal, fully overlapping pulses is modulated by a different data symbol, and they are then superimposed together within the same time-frequency region in order to increase the transmission spectral efficiency while maintaining a reliability performance comparable to that of basic OFDM waveform.…”

Section: E Shape-based Ofdm Familymentioning

confidence: 99%

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Modulation Options for OFDM-Based Waveforms: Classification, Comparison, and Future Directions

Jaradat¹,

Hamamreh²,

Arslan³

2019

IEEE Access

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This paper provides a comparative study on the performance of different modulation options for orthogonal frequency division multiplexing (OFDM) in terms of their spectral efficiency, reliability, peak-to-average power ratio, power efficiency, out-of-band emission, and computational complexity. The modulation candidates are classified into two main categories based on the signal plane dimension they exploit. These categories are: 1) 2-D signal plane category including conventional OFDM with classical fixed or adaptive QAM modulation and OFDM with differential modulation, where information is conveyed in changes between two successive symbols in the same subcarrier or between two consecutive subcarriers in the same OFDM symbol and 2) 3-D signal plane category encompassing: a) index-based OFDM modulation schemes which include: i) spatial modulation OFDM, where information is sent by the indices of antennas along with conventional modulated symbols and ii) OFDM with index modulation, where the subcarriers' indices are used to send additional information; b) number-based OFDM modulation schemes which include OFDM with subcarrier number modulation, in which number of subcarriers is exploited to convey additional information; and c) shape-based OFDM modulation schemes which include OFDM with pulse superposition modulation, where the shape of pulses is introduced as a third new dimension to convey additional information. Based on the provided comparative study, the relationship and interaction between these different modulation options and the requirements of future 5G networks are discussed and explained. This paper is then concluded with some recommendations and future research directions.

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Section: Fifth Generation Network Should Address An Increasinglymentioning

confidence: 99%

Section: Basic System Modelmentioning

confidence: 99%

Section: E Shape-based Ofdm Familymentioning

confidence: 99%

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Modulation Options for OFDM-Based Waveforms: Classification, Comparison, and Future Directions

Jaradat¹,

Hamamreh²,

Arslan³

2019

IEEE Access

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“…The optimal pulse is researched as a linear combination of several Hermite functions which are maximally localized in both time and frequency [18]. The th order Hermite function ℎ ( ) is given by…”

Section: Sir Maximization Criterion Based On the Optimal Pulsementioning

confidence: 99%

“…Equation (18) indicates that the most concentrated Hermite functions are used. The coefficients are assumed real.…”

Section: Sir Maximization Criterion Based On the Optimal Pulsementioning

confidence: 99%

Design of Robust Pulses to Insufficient Synchronization for OFDM/OQAM Systems in Doubly Dispersive Channels

Zhao

Chen

Xue

et al. 2015

Mathematical Problems in Engineering

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This paper presents a pulse shaping method robust to insufficient synchronization in orthogonal frequency division multiplexing with offset quadrature amplitude modulation (OFDM/OQAM) systems over doubly dispersive (DD) channels. The proposed pulse is designed as a linear combination of several well localized Hermite functions. The coefficients optimization problem is modeled as a nonconvex constrained fractional programming problem based on the signal-to-interference ratio (SIR) maximization criterion. An efficient iterative algorithm is applied to simplify the problem to a series of quadratically constrained quadratic program (QCQP) problems which can be solved by semidefinite relaxation (SDR) method. Simulation results show that the proposed pulse is superior to traditional pulses with respect to SIR performance over DD channels in the presence of carrier frequency offset (CFO) and timing offset (TO).

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Multi-user shared access in massive machine-type communication systems via superimposed waveforms

Catak

Tekce

Dizdar

et al. 2019

Physical Communication

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Spectrally Efficient OFDMA Lattice Structure via Toroidal Waveforms on the Time-Frequency Plane

Cited by 14 publications

References 12 publications

Modulation Options for OFDM-Based Waveforms: Classification, Comparison, and Future Directions

Modulation Options for OFDM-Based Waveforms: Classification, Comparison, and Future Directions

Design of Robust Pulses to Insufficient Synchronization for OFDM/OQAM Systems in Doubly Dispersive Channels

Multi-user shared access in massive machine-type communication systems via superimposed waveforms

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