Block Transceivers: OFDM and Beyond

Diniz, Paulo S. R.; Martins, Wallace A.; Lima, Markus V. S.

doi:10.2200/s00424ed1v01y201206com007

Cited by 13 publications

(24 citation statements)

References 68 publications

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“…Based on synchronization, the OFDM symbol structure is exceptional and simplifies synchronization. These advantages are well recognized and demonstrated in the literature [14], [28]- [30].…”

Section: Criteria For Waveforms Candidates a Ofdm Waveforms Criteriamentioning

confidence: 96%

Green Coexistence for 5G Waveform Candidates: A Review

2019

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There is a growing demand for 5G applications in all fields of knowledge. Current applications, such as the Internet of Things, smart homes, and clean energy, require sophisticated forms of 5G waveforms. Researchers and developers are investigating the requirements of 5G networks for better waveform types, which will result in high spectrum efficiency and lower latency with less complexity in systems. This paper proposes an assessment of various 5G waveform candidates [filtered orthogonal frequency-division multiplexing (OFDM), universal filtered multicarrier (UFMC), filter bank multicarrier (FBMC), and generalized frequency-division multiplexing] under the key performance indicators (KPIs). This paper assesses the main KPI factors (computational complexity, peak-to-average-power ratio, spectral efficiency, filter length, and latency). Moreover, this paper compares and evaluates all KPI factors in various 5G waveforms. Finally, this paper highlights the strengths and weaknesses of each waveform candidate based on the KPI factors for better outcomes in the industry. In conclusion, the current review suggests the use of optimized waveforms (FBMC and UFMC) for better flexibility to overcome the drawbacks encountered by previous works. Regarding coexistence, FBMC and UFMC showed better coexistence with CP-OFDM in 4G networks with a new radio spectrum. The rapprochement between the above-mentioned waveforms has been called green coexistence and is due to the mix between one waveform in 4G networks and two waveforms in 5G networks based on the subcarrier and subband shaping (FBMC and UFMC).

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Section: Criteria For Waveforms Candidates a Ofdm Waveforms Criteriamentioning

confidence: 96%

Green Coexistence for 5G Waveform Candidates: A Review

2019

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“…The MSE between the transmitted and estimated data blocks is used to derive the equalizer coefficients. Thus, the MMSE equalizer matrix [14] is…”

Section: B Minimum Mean Square Error Equalizermentioning

confidence: 99%

On Equalization Performance in Underwater Acoustic Communication

Pinho¹,

Chaves²,

Campos³

2018

Anais De XXXVI Simpósio Brasileiro De Telecomunicações E Processamento De Sinais

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This paper presents the results of a practical experiment of underwater acoustic transmission, which was performed in Arraial do Cabo, RJ. The primary focus of this experiment is analyzing the performance of different types of equalizers, namely: zero-forcing (ZF), minimum mean square error (MMSE) and decision feedback equalizer (DFE). The mean square error (MSE) and bit-error rate (BER) are the figures of merit used to compare their performances. Results show that in terms of MSE, the DFE has better performance than the other equalizers, achieving an MSE of −25.6 dB for signal-to-noise ratio (SNR) equal to 10 dB. Furthermore, the DFE outperformed the ZF and MMSE equalizers, improving BER by 5.3 dB with respect to the ZF equalizer, and 3.4 dB with respect to the MMSE equalizer.

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“…Let T ∈ R + be the period of an OFDM symbol and K = {−K/2, • • • , K/2 − 1} ⊂ Z be the set of indexes of all subcarriers, with K being the number of subcarriers [19]. The subcarriers' central frequencies are placed at f k = k/T, k ∈ K, in baseband transmissions.…”

Section: A Transmittermentioning

confidence: 99%

“…Let T g ∈ R + be the guard period of a zero-padded (ZP) OFDM [19] symbol and T bl = T + T g be the total time of transmitted blocks, including the windowing operation and the guard interval, as illustrated in Fig. 1.…”

Section: A Transmittermentioning

confidence: 99%

See 1 more Smart Citation

Modeling and Simulation of Underwater Acoustic Communication Systems

Chaves¹,

Martins²,

Diniz³

2017

Anais De XXXV Simpósio Brasileiro De Telecomunicações E Processamento De Sinais

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This work describes a simple model for underwater acoustic (UWA) channels, taking into account Doppler effects. The performance of orthogonal frequency-division multiplexing (OFDM) systems in UWA channels is also studied. The impact of Doppler effects on OFDM transmissions is thoroughly investigated, and a simple two-step compensation strategy is described. In order to evaluate UWA models, a versatile UWA channel simulator is developed and some simulations are performed to measure the OFDM performance for time-variant channels. Those simulations evaluate the bit-error-rate and sensitivity of OFDM systems to Doppler effects. The results are satisfactory and show that only one compensation step is necessary to maintain a reasonable system performance for relative estimation errors of Doppler scaling factor in the order of 10 −5 , corroborating that OFDM systems are suitable in some specific scenarios.

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Block Transceivers: OFDM and Beyond

Cited by 13 publications

References 68 publications

Green Coexistence for 5G Waveform Candidates: A Review

Green Coexistence for 5G Waveform Candidates: A Review

On Equalization Performance in Underwater Acoustic Communication

Modeling and Simulation of Underwater Acoustic Communication Systems

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