Abstract
One of the challenges faced by indoor power line communication systems is the frequency-selective channels that are time varying and dependent on a large number of variabilities. A probable solution is to extract as much determinism as possible through prediction and statistical analysis of the frequency-selective notches. However, such deterministic tools are available only for simple open- and short-circuit branches and not for complex loads and topologies. This paper proposes an alternate method to predict and analyze notches using a minimum of four parameters without evaluating the transfer function. Termed as the load frequency mapping, the method is applicable for any frequency-dependent time-invariant loads and topologies and also capable of performing statistical analysis of random channels. A high decrease in prediction error (99.46–93.63%) is found for all the channels analyzed. Statistical analysis of 26 power line cables using random loads shows that some cables and loads offer more variations in frequency selectivity than others. For capacitive loads, the variation is more for the low-frequency notches and for those modeled as parallel resonant circuits at the frequencies near the resonance. Maximum variation is found for cables with high characteristic impedance with loads having high resonant frequencies and low quality factor and least for inductive loads. The power line therefore has considerable amount of determinism, and this can be incorporated to complement for fading channels or analysis of variability optimized for dual purpose of power delivery and data transfer.
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Abbreviations
- BPLC:
-
Broadband PLC
- BW:
-
Bandwidth
- CWB:
-
Coherence bandwidth
- DMT:
-
Discrete multitone modulation
- DB:
-
Derivation box
- EMC:
-
Electromagnetic compatibility
- FDL:
-
Frequency-dependent load
- HAN:
-
Home area network
- HAP:
-
House access point
- HV:
-
High voltage
- IMC:
-
Imaginary characteristics
- IA:
-
Input admittance
- ISI:
-
Inter symbol interference
- IED:
-
Intelligence electronic device
- IR:
-
Impulse response
- LFC:
-
Load frequency curve
- LFM:
-
Load frequency mapping
- LPTV:
-
Linear periodic time variant
- LV:
-
Low voltage
- MTL:
-
Multi-conductor line
- MV:
-
Medium voltage
- NB-PLC:
-
Narrowband PLC
- PL:
-
Power line
- PLC:
-
Power line communication
- RMS-DS:
-
Root mean square delay spread
- SG:
-
Smart grid
- SP:
-
Service panel
- TEM:
-
Transverse electromagnetic
- TF:
-
Transfer function
- TL:
-
Transmission line
- C :
-
Capacitance/length
- L :
-
Inductance/length
- \(Z_{0}\) :
-
Characteristics impedance
- \(Z(\omega )/Z(\omega ,t)\) :
-
Time-variant load
- R :
-
Resistance
- \(\omega \) :
-
Angular frequency
- \(\omega _{0}\) :
-
Resonant angular frequency
- \(f_{0}\) :
-
Resonant frequency
- Q :
-
Quality factor
- \(\varphi \) :
-
Phase term in time-dependent load
- \(Z_{\mathrm{A}}\) :
-
Offset impedance
- \(Z_{\mathrm{B}}\) :
-
Amplitude of variation
- H(f):
-
Transfer function
- \(N^{\prime }\) :
-
Number of paths
- \(g_{i} \) :
-
Complex number
- T :
-
Time period
- F :
-
Frequency
- \(\tau _{i}\) :
-
Path delay
- \(\alpha (f)\) :
-
Attenuation coefficient
- \(d_{i}\) :
-
Path length
- A, B, C, D:
-
ABCD matrices
- \(Z_{\mathrm{L}} \) :
-
Load impedance
- \(Z_{\mathrm{S}}\) :
-
Source impedance
- \(f_k^{\mathrm{open}}\) :
-
Open-circuit notch frequency
- \(f_k^{\mathrm{short}}\) :
-
Short-circuit notch frequency
- \(v_\mathrm{p}\) :
-
Phase velocity
- \(l_{\mathrm{br}}\) :
-
Branch length
- \(Z_{\mathrm{in}}\) :
-
Input impedance
- \(Z_{\mathrm{br}}\) :
-
Load in branch
- \(\gamma \) :
-
Propagation constant
- y :
-
Imaginary load
- x :
-
Real component of the load
- \(Y_{\mathrm{in}}\) :
-
Input admittance
- \(f_1^{\mathrm{open}}\) :
-
First open-circuit notch frequency
- w :
-
Roll-off
- a :
-
Constant
- \(R^2\) :
-
Regression value
- \(F_{i}(y)\) :
-
Notch frequency
- C1–C26:
-
Cables 1 to 26
- \(\hbox {Im} \left\{ Z_{\mathrm{br}}(f)\right\} \) :
-
Imaginary characteristics of load
- \(\Delta f\) :
-
Deviation of frequency
- \(Y^{N}_{IN{\text {-}}STAR}\) :
-
IA (Star)
- \(Z^{N}_{\mathrm{total}}\) :
-
Total impedance at node n
- \(Y_{\mathrm{open}}\) :
-
IA of open branch
- \(Y^{N}_{IN{\text {-}}BUS}\) :
-
IA (Bus)
- \(Y_{N-1}\) :
-
IA of qp
- \(y_{N-1}\) :
-
IA of qn
- \(Y_{\mathrm{open}\_N-1}\) :
-
IA of mq
- \(y^{2}_{IN{\text {-}}STAR}\) :
-
IA of Star (2 branches)
- \(y^{3}_{IN{\text {-}}STAR}\) :
-
IA of Star (3 branches)
- \(y^{8}_{IN{\text {-}}STAR}\) :
-
IA of Star (8 branches)
- \(y^{1}_{IN{\text {-}}BUS}\) :
-
IA of Bus (1 branch)
- \(y^{2}_{IN{\text {-}}BUS}\) :
-
IA of Bus (2 branches)
- \(y^{6}_{IN{\text {-}}BUS}\) :
-
IA of Bus (6 branches)
- L :
-
Inductive load
- C :
-
Capacitive load
- \(\hbox {RLC}_{1}\) :
-
RLC load (experimental)
- \(\hbox {RLC}_{2}\) :
-
RLC load (experimental)
- \(\hbox {RLC}_{3}\) :
-
RLC load (experimental)
- \(\mu \) :
-
Mean of notches
- \(\sigma \) :
-
Standard deviation of notch
- \(\mu _{\mathrm{p}}\) :
-
Mean of predicted notches
- \(\sigma _{\mathrm{p}}\) :
-
Standard deviation of predicted notches
- \(\mu _{\mathrm{a}}\) :
-
Mean of actual notch
- \(\sigma _{\mathrm{a}}\) :
-
Standard deviation of actual notch
- \(\mu _{\Delta f}\) :
-
Mean of \(\Delta f\)
- \(\sigma _{\Delta f}\) :
-
Standard deviation of \(\Delta f\)
- RLC1:
-
RLC load
- RLC2:
-
RLC load
- RLC3:
-
RLC load
- RLC4:
-
RLC Load
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Baishya, R., Tiru, B. & Sarma, U. An Alternate Method for Prediction and Analysis of Notch Characteristics in Indoor Power Lines Under Varied Channel Conditions. Arab J Sci Eng 45, 1531–1552 (2020). https://doi.org/10.1007/s13369-019-04052-w
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DOI: https://doi.org/10.1007/s13369-019-04052-w