OFDM: today and in the future of next generation wireless communications

Arrano, Hernan F.; Azurdia-Meza, César A.

doi:10.1109/conescapan.2016.8075209

Cited by 19 publications

(8 citation statements)

References 31 publications

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“…Passive optical networks (PONs) are considered worldwide as one of the most promising candidates for realizing the highly desired network convergence [2,7]. On the other hand, it is also widely envisaged that the initial stage of 5G should also have sufficient transparency to orthogonal frequency division multiplexing (OFDM)-based 4G [8,9]. As such, optical OFDM multiple access (OFDMA) PONs are expected to play a crucial role in future converged networks, as they can offer a number of well-documented salient advantages including high spectral efficiency, adaptive signal modulation according to channel characteristics, dynamic bandwidth allocation (DBA) with fine bandwidth granularity, trivial equalization through simple complex multiplication per subcarrier, as well as excellent tolerance to chromatic dispersion.…”

Section: Introductionmentioning

confidence: 99%

Hybrid OFDM-Digital Filter Multiple Access PONs

Dong

Giddings

Tang

2018

J. Lightwave Technol.

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Section: Introductionmentioning

confidence: 99%

Hybrid OFDM-Digital Filter Multiple Access PONs

Dong

Giddings

Tang

2018

J. Lightwave Technol.

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“…To enable the PON-based converged 5G networks to offer on-demand heterogeneous services in a multiple virtual operator-shared environment, software defined networking (SDN) is vital to transfer the present inflexible and vendor-locked network infrastructure into an agile and flexible platform [5,6]. Furthermore, it is also greatly advantageous if the abovementioned flexible networks have good backward compatibility to existing orthogonal frequency division multiplexing (OFDM)-based 4G networks [7].…”

Section: Introductionmentioning

confidence: 99%

Hybrid DFT-Spread OFDM-Digital Filter Multiple Access PONs for Converged 5G Networks

Dong¹,

Jin²,

Giddings³

et al. 2019

J. Opt. Commun. Netw.

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Hybrid discrete Fourier transform (DFT)-spread orthogonal frequency division multiplexing (OFDM)-digital filter multiple access (DFMA) passive optical networks (PONs) are proposed, for the first time, where digital signal processing (DSP)based digital filtering is applied to individual DFT-spread OFDM signals from various optical network units (ONUs), and a single FFT operation and its following data recovery processes are implemented in a pipelined approach in the optical line terminal (OLT). The proposed networks maintain all salient features associated with previously reported hybrid OFDM-DFMA PONs, more importantly, they additionally reduce the upstream signal peak-to-average power ratios (PAPRs) by >2dB. As a direct result, in comparison with the hybrid OFDM-DFMA PONs, the proposed PONs increase the upstream system power budget by >3dB and reduce the minimum required DAC/ADC quantization bits by at least 1 bit.

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“…OFDM is popular in today's 4G-LTE system [27], [28]. OFDM is a very powerful transmission technique.…”

Section: Measurement Resultsmentioning

confidence: 99%

A 67-86 GHz Spectrum-Efficient CMOS Transmitter Supporting 1024-QAM With a Process-Variation-Tolerant Design

et al. 2020

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This paper describes a direct-conversion E-band transmitter (TX) in 65-nm CMOS. To demonstrate the feasibility of E-band 1024-quadrature amplitude modulation (QAM), a 67 to 86 GHz direct-conversion CMOS transmitter with broadband image rejection is presented. The transmitter contains an I (in-phase) and Q (quadrature-phase) modulator and a five-stage power amplifier. To achieve a 40 dBc image-rejection ratio (IRR) of the I/Q modulator for E-band, a broadband half-quadrature generator (HQG), which contains a composite right/left-handed (CRLH) based divider, quadrature couplers, and baluns is proposed. For the purpose of minimizing the phase imbalance, phase balance lines are utilized in HQG to achieve a 1-degree phase accuracy under different tuning lines. Subsequently, the reflection can be mitigated by optimizing the impedance matching between the HQG and the mixer core. Meanwhile, because millimeter-wave (MMW) circuits are susceptible to process variations, a process-variation-tolerant design is introduced to mitigate IRR variation, especially under 40 dBc. The transmitter demonstrates a measured flat conversion gain (CG) of 23 ± 2 dB from 56 to 86 GHz. The proposed TX achieves an IRR better than 40 dBc from 67 to 86 GHz (bandwidth of 19 GHz) with a peak IRR of 56.2 dBc at 70 GHz. Furthermore, the proposed TX has exhibited a 6 bit/s/Hz spectral efficiency with 1024-QAM under the orthogonal frequency-division multiplexing (OFDM) modulation format. The 1.129 mm 2 E-band TX achieves a measured output power of 6.5 dBm with a total dc power consumption of 164 mW from a 1.2 V supply voltage. INDEX TERMS CMOS, E-band, half-quadrature generator (HQG), image-rejection ratio (IRR), millimeter-wave (MMW) integrated circuit, process-variation-tolerant design, transmitter (TX), 1024-quadrature amplitude modulation (QAM).

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OFDM: today and in the future of next generation wireless communications

Cited by 19 publications

References 31 publications

Hybrid OFDM-Digital Filter Multiple Access PONs

Hybrid OFDM-Digital Filter Multiple Access PONs

Hybrid DFT-Spread OFDM-Digital Filter Multiple Access PONs for Converged 5G Networks

A 67-86 GHz Spectrum-Efficient CMOS Transmitter Supporting 1024-QAM With a Process-Variation-Tolerant Design

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