Resource Allocation in HS-OFDM-based PLC Systems: A Tutorial

Oliveira, Lucas Giroto de; Colen, Guilherme R.; Vinck, A. J. Han; Ribeiro, Moisés V.

doi:10.14209/jcis.2018.31

Cited by 15 publications

(12 citation statements)

References 56 publications

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“…OFDM is a well-established scheme, which divides a channel frequency response (CFR) into flat and orthogonal subchannels thus allowing advantage over the frequency selective channel. Regarding OFDM, [2] presented a detailed tutorial for resource allocation in PLC systems for Hermitian symmetric OFDM (HS-OFDM), which is a version of the OFDM applied to baseband communications systems. However, the OCDM scheme, which divides the data into subchirps using the Fresnel transform, is a relatively new concept for data communication and was first addressed in [3].…”

Section: Nevertheless Research Work Continues To Develop Techniquesmentioning

confidence: 99%

Data rate and bit error probability in Narrowband PLC systems: OCDM versus HS-OFDM

Moreira¹,

Camponogara²,

Baig³

et al. 2021

Anais Do XXXIX Simpósio Brasileiro De Telecomunicações E Processamento De Sinais

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This study proposes a performance comparison between the orthogonal chirp division multiplexing (OCDM) and Hermitian symmetric orthogonal frequency division multiplexing (HS-OFDM) schemes in terms of data rate and bit error probability in the context of narrowband power line communication (PLC) systems. To analyze data rate of various power allocation techniques, we consider optimal, sub-optimal, and uniform power allocation techniques. Numerical results show that the OCDM eventually outperforms the HS-OFDM in terms of bit error probability when uniform power allocation applies and the HS-OFDM normalized signal to noise ratio is frequency selective. In contrast, the OCDM offers the lowest data rate performance when all the chosen power allocation techniques are considered. Thus, the OCDM can be more appropriate for low-bit-rate PLC systems when channel state information is not available at the transmitter side and fixed digital constellation is applied.

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Section: Nevertheless Research Work Continues To Develop Techniquesmentioning

confidence: 99%

Data rate and bit error probability in Narrowband PLC systems: OCDM versus HS-OFDM

Moreira¹,

Camponogara²,

Baig³

et al. 2021

Anais Do XXXIX Simpósio Brasileiro De Telecomunicações E Processamento De Sinais

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show abstract

“…Finally, we present a discussion regarding SER, which is the main focus of the modifications brought by the enhanced techniques. An SER upper bound is imposed on the system as [7] thoroughly describes. This constraint is evaluated based on the gap from the Shannon capacity curve (Γ) and can be expressed as…”

Section: Enhanced Temporal Compressive Resource Allocationmentioning

confidence: 99%

An Enhanced Temporal Compressive Resource Allocation Technique for PLC Systems

Coutinho¹,

Colen²,

Ribeiro³

2020

Anais De XXXVIII Simpósio Brasileiro De Telecomunicações E Processamento De Sinais

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This work introduces enhanced versions of the temporal compressive resource allocation technique, which is applied for power line communication systems when the periodically time varying behavior of electric power systems is taken into account. The enhancements are accomplished by introducing two changes that increase the effectiveness of the resource allocation process based on rate adaptation. The first change refers to the use of the minimum signal-to-noise ratio of each set of microslots for preventing symbol error rate peaks in some microslots. The second change imposes the use of the normalized signal-tonoise ratio matrix to estimate the correlation among microslots since it is a more reliable parameter to provide such type of information. Numerical results, based on a comparison between the full enhanced version, a partial enhanced version and the original technique, show that both enhanced versions are capable of fulfilling symbol error rate upper bound with reduced data rate loss penalty in comparison to the original one. Also, the use of the normalized signal-to-noise ratio matrix results in higher computational complexity reduction.

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“…This vector is inputted to the function P(•) that represents, in a condensed form, the digital processing performed at the transmitter side, which is composed by three processing stages. The first one is the Hermitian symmetric mapping M ap(•) [21] that transforms D into the 2N -length discrete-frequency domain HS-OFDM symbol…”

Section: System Modelmentioning

confidence: 99%

“…For TDMA and FDMA schemes, the SINR for each PLMs is equal to the ratio between the total received signal power and the total additive noise power, being equivalent the overall SNR considering the allocated subcarriers to them. The CDMA case, on the other hand, has also an interference noise term resulting from the decoding process from (20) and pointed out in (21). As a consequence, the SINR at the four PLMs is equal to the ratio between their associated total received signal power and the total additive noise plus interference noise power.…”

Section: Channel Estimation With Multiple Accessmentioning

confidence: 99%

HS-OFDM-based Time-Domain Reflectometry for Power Line Sensing: Characteristics and Limitations

de Oliveira,

Filomeno,

Ribeiro

2019

Preprint

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This study discusses key characteristics and limitations of time-domain reflectometry (TDR) systems based on the Hermitian symmetric orthogonal frequency-division multiplexing (HS-OFDM) scheme for power line sensing. In this sense, a system model with a power line modem injecting signals and capturing raising reflections for sensing a power distribution network is outlined. Next, pulse compression and channel estimation reflectogram processing approaches are carefully described and the effects of system parametrization and multiple access schemes on the HS-OFDM-based TDR system performance are addressed. Finally, numerical results covering a comparison between pulse compression and channel estimation, system limitations based on parametrization considering typical European underground low-voltage and US overhead medium-voltage (MV) scenarios and narrowband (NB) power line communication (PLC) regulatory constraints, and comparison among multiple access techniques in a Brazilian MV overhead scenario are presented for supporting the carried out discussion. Based on the attained results, it is shown that channel estimation outperforms the pulse compression in terms of computational complexity and sidelobe level. Also, it is shown that the NB-PLC frequency range provides fair range resolution and maximum unambiguous range values. Finally, it is seen that the use of the frequencydivision multiple access multiple access schemes presents different signal-to-interference-plus-noise ratio (SINR) performance among different power line modems (PLMs) connected to a power distribution grid, while the use of time-division multiple access and code-division multiple access schemes results in fair SINR performance among the PLMs at the cost of obtaining less reflectograms over time due to time multiplexing and spreading processes, respectively.

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Resource Allocation in HS-OFDM-based PLC Systems: A Tutorial

Cited by 15 publications

References 56 publications

Data rate and bit error probability in Narrowband PLC systems: OCDM versus HS-OFDM

Data rate and bit error probability in Narrowband PLC systems: OCDM versus HS-OFDM

An Enhanced Temporal Compressive Resource Allocation Technique for PLC Systems

HS-OFDM-based Time-Domain Reflectometry for Power Line Sensing: Characteristics and Limitations

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