Publication

On Two Unicast Wireless Networks with Destination-to-Source Feedback

I-Hsiang Wang
2012
Conference Papers

Abstract

In this paper we study the role of feedback in layered two unicast wireless networks with arbitrary number of nodes and connectivity. The feedback model allows destinations to feedback their received signals to their respective sources. In the case of linear deterministic networks, we fully characterize the capacity region when the two individual minimum cut values are equal to 1 and show that feedback only helps increase capacity whenever the capacity region without feedback has (1, 1/2) or (1/2, 1) as its corner point but not both. Therefore, feedback helps balance the resource utilization of the two users, similar to the role of feedback in the two-user interference channel [1].

Official source

https://infoscience.epfl.ch/entities/publication/55214f93-ef5a-471a-8b88-4c0af6df1b82

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I-Hsiang Wang
2012
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/55214f93-ef5a-471a-8b88-4c0af6df1b82

About this result

Related concepts (21)

Negative feedback

Negative feedback (or balancing feedback) occurs when some function of the output of a system, process, or mechanism is fed back in a manner that tends to reduce the fluctuations in the output, whether caused by changes in the input or by other disturbances. Whereas positive feedback tends to lead to instability via exponential growth, oscillation or chaotic behavior, negative feedback generally promotes stability. Negative feedback tends to promote a settling to equilibrium, and reduces the effects of perturbations.

Climate change feedback

Climate change feedbacks are effects of global warming that amplify or diminish the effect of forces that initially cause the warming. Positive feedbacks enhance global warming while negative feedbacks weaken it. Feedbacks are important in the understanding of climate change because they play an important part in determining the sensitivity of the climate to warming forces. Climate forcings and feedbacks together determine how much and how fast the climate changes.

Feedback

Feedback occurs when outputs of a system are routed back as inputs as part of a chain of cause-and-effect that forms a circuit or loop. The system can then be said to feed back into itself. The notion of cause-and-effect has to be handled carefully when applied to feedback systems: Simple causal reasoning about a feedback system is difficult because the first system influences the second and second system influences the first, leading to a circular argument.

Related publications (31)

On Two Unicast Wireless Networks with Destination-to-Source Feedback

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