The Power Delay Profile of the Single Antenna Full-Duplex Self-Interference Channel in Indoor Environments at 2.4 GHz

2015 ◽  
Vol 713-715 ◽  
pp. 1166-1170
Author(s):  
Xiang Yu Wu ◽  
Ying Shen ◽  
You Xi Tang ◽  
Shi Chuan Xiao
Keyword(s):  
Power Law ◽  
Random Variable ◽  
Full Duplex ◽  
Center Frequency ◽  
Indoor Environments ◽  
Interference Channel ◽  
Power Delay Profile ◽  
Single Antenna ◽  
Leakage Path ◽  
Power Law Decay

The power delay profile (PDP) of the single antenna full-duplex self-interference channel (SIC) is studied in the indoor environments in this paper. We perform the measurements at the center frequency of 2.4 GHz with 100 MHz bandwidth. The PDP can be decomposed into three components: leakage path (LP), antenna reflection path (ARP), and space multipath (SMP). Furthermore, we get the model of the profiles of the leakage path and the antenna reflection path. The space multipath can be modeled as power-law decay plus a random variable with lognormal statistics.

scholarly journals Influence of loopback interference channel in energy harvesting full-duplex relaying network over block rayleigh fading channel: performance analysis

2021 ◽  
Vol 23 (1) ◽  
pp. 302
Author(s):  
Phu Tran Tin ◽  
Van-Duc Phan ◽  
Le Anh Vu
Keyword(s):  
Monte Carlo Simulation ◽  
Energy Harvesting ◽  
System Performance ◽  
Fading Channel ◽  
Rayleigh Fading ◽  
Main Idea ◽  
Random Variable ◽  
Full Duplex ◽  
Mathematical Form ◽  
Interference Channel

The main idea of this paper is to investigate the system performance (SP) ofenergy harvesting FD relaying network over block rayleigh fading channelunder the influence of the loopback interference channel. In the first stage,we proposed the system modeland analyzed the energy harvesting and theinformation transmission phases. Furthermore, the mathematical form for theoutage probability (OP) is analyzed and derived in two kinds of loopbackinterference: residual self-interference is modeled as AWGN vàresidual self-interference is still a random variable. All the mathematical, analyticalexpressions are verified using the Monte Carlo simulation.

A tuneable rat-race coupler for full duplex communications

2021 ◽  
pp. 1-7
Author(s):  
G. T. Watkins
Keyword(s):  
Interference Cancellation ◽  
Phase Shifter ◽  
Dipole Antenna ◽  
Full Duplex ◽  
Frequency Channel ◽  
Ism Band ◽  
Single Antenna ◽  
Variable Attenuator ◽  
Degree Of Isolation ◽  
Better Than

Abstract Full duplex (FD) could potentially double wireless communications capacity by allowing simultaneous transmission and reception on the same frequency channel. A single antenna architecture is proposed here based on a modified rat-race coupler to couple the transmit and receive paths to the antenna while providing a degree of isolation. To allow the self-interference cancellation (SiC) to be maximized, the rat-race coupler was made tuneable. This compensated for both the limited isolation of the rat race and self-interference caused by antenna mismatch. Tuneable operation was achieved by removing the fourth port of the rat race and inserting a variable attenuator and variable phase shifter into the loop. In simulation with a 50 Ω load on the antenna port, better than −65 dB narrowband SiC was achieved over the whole 2.45 GHz industrial, scientific and medical (ISM) band. Inserting the S-parameters of a commercially available sleeve dipole antenna into the simulation, better than −57 dB narrowband SiC could be tuned over the whole band. Practically, better than −58 dB narrowband tuneable SiC was achieved with a practical antenna. When excited with a 20 MHz Wi-Fi signal, −42 dB average SiC could be achieved with the antenna.

scholarly journals A Feasibility Study for Simultaneous Estimates of Water Vapor and Precipitation Parameters Using a Three-Frequency Radar

2005 ◽  
Vol 44 (10) ◽  
pp. 1511-1525 ◽  
Author(s):  
R. Meneghini ◽  
L. Liao ◽  
L. Tian
Keyword(s):  
Water Vapor ◽  
Rayleigh Scattering ◽  
Pulse Compression ◽  
Pulse Repetition Frequency ◽  
Center Frequency ◽  
Water Vapor Absorption ◽  
Single Antenna ◽  
Vapor Absorption ◽  
The Cost ◽  
Lower Frequencies

Abstract The radar return powers from a three-frequency radar, with center frequency at 22.235 GHz and upper and lower frequencies chosen with equal water vapor absorption coefficients, can be used to estimate water vapor density and parameters of the precipitation. A linear combination of differential measurements between the center and lower frequencies on one hand and the upper and lower frequencies on the other provide an estimate of differential water vapor absorption. The coupling between the precipitation and water vapor estimates is generally weak but increases with bandwidth and the amount of non-Rayleigh scattering of the hydrometeors. The coupling leads to biases in the estimates of water vapor absorption that depend primarily on the phase state and the median mass diameter of the hydrometeors. For a down-looking radar, path-averaged estimates of water vapor absorption are possible under rain-free as well as raining conditions by using the surface returns at the three frequencies. Simulations of the water vapor attenuation retrieval show that the largest source of error typically arises from the variance in the measured radar return powers. Although the error can be mitigated by a combination of a high pulse repetition frequency, pulse compression, and averaging in range and time, the radar receiver must be stable over the averaging period. For fractional bandwidths of 20% or less, the potential exists for simultaneous measurements at the three frequencies with a single antenna and transceiver, thereby significantly reducing the cost and mass of the system.

scholarly journals When an oscillating center in an open system undergoes power law decay

2018 ◽  
Vol 57 (3) ◽  
pp. 750-768 ◽  
Author(s):  
Sandip Saha ◽  
Gautam Gangopadhyay
Keyword(s):  
Power Law ◽  
Open System ◽  
Power Law Decay

scholarly journals Analysis of the buildup of spatiotemporal correlations and their bounds outside of the light cone

2018 ◽  
Vol 5 (5) ◽  
Author(s):  
Nils O. Abeling ◽  
Lorenzo Cevolani ◽  
Stefan Kehrein
Keyword(s):  
Correlation Function ◽  
Power Law ◽  
Light Cone ◽  
Relativistic Quantum ◽  
Initial State ◽  
Quantum Theories ◽  
Luttinger Model ◽  
Power Law Decay ◽  
Exactly Solvable ◽  
Exponentially Small

In non-relativistic quantum theories the Lieb-Robinson bound defines an effective light cone with exponentially small tails outside of it. In this work we use it to derive a bound for the correlation function of two local disjoint observables at different times if the initial state has a power-law decay. We show that the exponent of the power-law of the bound is identical to the initial (equilibrium) decay. We explicitly verify this result by studying the full dynamics of the susceptibilities and correlations in the exactly solvable Luttinger model after a sudden quench from the non-interacting to the interacting model.

scholarly journals Interference Channel With Full-Duplex Amplify-and-Forward Transmitter Cooperations

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 118994-119008 ◽  
Author(s):  
Jianhao Huang ◽  
Dan Wang ◽  
Chuan Huang
Keyword(s):  
Full Duplex ◽  
Interference Channel ◽  
Amplify And Forward

scholarly journals A formula for hidden regular variation behavior for symmetric stable distributions

Extremes ◽  
2020 ◽  
Vol 23 (4) ◽  
pp. 667-691
Author(s):  
Malin Palö Forsström ◽  
Jeffrey E. Steif
Keyword(s):  
Power Law ◽  
Spectral Measure ◽  
Regular Variation ◽  
Stable Distributions ◽  
Decay Rates ◽  
Random Vectors ◽  
Power Law Decay ◽  
Exact Power ◽  
Hidden Regular Variation ◽  
Stable Random Vectors

Abstract We develop a formula for the power-law decay of various sets for symmetric stable random vectors in terms of how many vectors from the support of the corresponding spectral measure are needed to enter the set. One sees different decay rates in “different directions”, illustrating the phenomenon of hidden regular variation. We give several examples and obtain quite varied behavior, including sets which do not have exact power-law decay.

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