Research on the memory order of the power‐line communication channel

Finite-state Markov channels (FSMCs) are widely employed to model the memory of time-correlated discrete fading channels (DFCs). This work proposes a special class of FSMCs, denoted birth-death channels (BDCs), to model the statistical behavior of the DFC. The number of states that generates accurate BDCs is estimated for a broad range of fading environments. Next, we evaluate the performance of error-correcting codes over the BDC. A statistic of interest for this analysis is the P(m, n), the probability the channel generates up to m errors in a block of length n. It also proposed a combinatorial method to evaluate the probability P(m, n) for the BDC. The study of the statistical description of this channels has applications in modeling real channels and in designing coded systems for channels with memory.KEYWORDS channels with memory, error probability, fading channels, finite-state Markov channels, sequence enumeration Int J Commun Syst. 2019;32:e4017.wileyonlinelibrary.com/journal/dac

Section: Introductionmentioning

confidence: 99%

Markov modeling of discrete fading channels using birth‐death channels

Moreira¹,

Pimentel

2019

“…Thus, it presents a harsh and noisy communications channel, which is not favorable for the high-frequency communications signal transmission with frequency ranging from 0 to 30 MHz [6][7][8]. Thus, it presents a harsh and noisy communications channel, which is not favorable for the high-frequency communications signal transmission with frequency ranging from 0 to 30 MHz [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Unlike other communication technologies (e.g., a local-area network, a digital subscriber line, and cable), power lines are not meant to be used for communication purposes, but for transmitting one-directional electric power in the frequency range of 50 or 60 Hz. Thus, it presents a harsh and noisy communications channel, which is not favorable for the high-frequency communications signal transmission with frequency ranging from 0 to 30 MHz [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Mitigation of the moving radio interferences in the OFDM‐based power line communication channels in China

Zhai

2014

Under some special environments in China, there exist moving radio radiations with high transmission powers that can degrade the performance of the power line communications systems significantly. Such radiations overlap with the OFDM-based signals in time and frequency domains, and hence, it is very difficult to mitigate directly if not possible. The paper introduced the fractional Fourier transform trying to deal with such moving radio interferences. When using the fractional Fourier transform to separate signals and noises/interferences, the fractional order plays a key role, but there is no method to obtain its optimal value in the published papers. In the paper, like for the time-frequency representations, we defined the second moments of the fractional Fourier transform of the signal. The fractional order, corresponding the maximum of the second moments, is the one used to separate the OFDM signals and the moving radio interferences, which is modelled as the Doppler signals in our scheme. The proposed method can mitigate the moving radio interferences significantly by applying the proposed method to the simulated OFDM signals and the measurements data. The results also show that the system's BERs can be improved from 10 2 to 10 5 for lower signal-noise-rate (SNR), and from 10 4 to 10 9 for high SNRs.

“…The authors of References [] analyze the disadvantage caused by the load impedance, the unfavorable noise and the multipaths of the power line communication network. In References [], the authors have presented field test and simulation results of the power line carrier signal propagation characteristics. These studies are very helpful to understand the transmission channel properties of PLC, such as transfer function, interference and channel capacity.…”

Section: Introductionmentioning

confidence: 99%

A hybrid relay control mechanism for ribbon topology in low‐voltage power line communication networks

Xiang

Wen

Hou³

2014

SUMMARYThe communication reliability and distance of the low-voltage power line communication system are seriously affected by the channel interference and the time variant load impedance. Therefore, how to control the relay nodes to reduce the communication delay and improve the communication reliability is mainly considered in the design. A novel hybrid relay control mechanism (HRCM) that includes the static relay pre-configuration and the dynamic relay selection is designed for the ribbon topology in the low-voltage power line communication networks. In the ribbon topology, the initial configuration for the communication link is realized through the pre-configure relay nodes, which guarantees that the concentrator can communicate with the furthest terminal node. During the normal operations, the dynamic relay node is selected according to the sequence number of the uplink or downlink data frame and the data discard strategy. With the relay node dynamical selected mechanism, the frame repeated transmission can be avoided and the communication delay is reduced. The actual test results show that the hybrid relay control mechanism can effectively extend the communication distance, improve the communication real-time and the reliability of the low-voltage power line communication.