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Related Concept Videos

Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

125
Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
125
Lossy Lines and Overvoltages01:22

Lossy Lines and Overvoltages

114
Transmission-line series resistance and shunt conductance cause three primary effects: attenuation, distortion, and power losses.
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...
114
Lossless Lines01:23

Lossless Lines

157
In electrical engineering, a lossless transmission line is characterized by a purely imaginary propagation constant and a resistive characteristic impedance. The ABCD parameters, which describe the relationship between the input and output voltages and currents, indicate an equivalent π circuit with an imaginary series impedance and a shunt admittance. This results in a transmission line that, when the product of the phase constant (beta) and the length of the line is less than pi,...
157
Transmission Line Design Considerations01:23

Transmission Line Design Considerations

179
Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
179
Reducing Line Loss01:18

Reducing Line Loss

180
In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss...
180
Traveling Waves: Lossless Lines01:27

Traveling Waves: Lossless Lines

166
The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx  and a shunt capacitance CΔx.
166

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Quasi-light Storage for Optical Data Packets
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Lossy State Communication over Fading Multiple Access Channels.

Viswanathan Ramachandran1

  • 1KTH Royal Institute of Technology, 114 28 Stockholm, Sweden.

Entropy (Basel, Switzerland)
|May 16, 2023
PubMed
Summary

This study analyzes joint communication and sensing systems, revealing a complete trade-off between communication rates and state estimation distortion. Optimal strategies involve static power allocation and uncoded transmissions for enhanced wireless performance.

Keywords:
MMSEdirty paper codingdistortion-rate trade-off regionfading channelsjoint compression and error correctionjoint source-channel codingmultiple access channels

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Last Updated: Jul 30, 2025

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Area of Science:

  • Information Theory
  • Wireless Communications
  • Signal Processing

Background:

  • Next-generation wireless systems require integrated communication and sensing due to bandwidth demands and spectral scarcity.
  • Existing research lacks information-theoretic analysis of joint sensing and communication systems under practical limitations like fading.

Purpose of the Study:

  • To conduct a network information-theoretic analysis of a joint communication and sensing system.
  • To characterize the distortion-rate trade-off for state estimation and message communication in a fading Gaussian multiple access channel.

Main Methods:

  • Considered a state-dependent fading Gaussian multiple access channel (GMAC) with non-causally available state information.
  • Analyzed a system with stationary, ergodic fading gains known only at the receiver.
  • Investigated joint message communication and state estimation to meet mean-squared error distortion targets.

Main Results:

  • Provided a complete characterization of the distortion-rate trade-off region for a two-sender GMAC.
  • Identified optimal strategies involving static power allocation and uncoded transmissions to amplify the state.
  • Demonstrated the effectiveness of superposition coding with Gaussian codebooks and dirty paper coding (DPC).

Conclusions:

  • The findings offer design directives for realistic joint sensing and transmission systems in next-generation wireless standards.
  • Highlighted the benefits of uncoded communications and joint source-channel coding in such integrated systems.