Revision #2 Authors: Klim Efremenko, Gillat Kol, Dmitry Paramonov, Raghuvansh Saxena

Accepted on: 16th December 2022 02:00

Downloads: 125

Keywords:

Much of today's communication is carried out over large wireless systems with different input-output behaviors. In this work, we compare the power of central abstractions of wireless communication through the general notion of boolean symmetric $f$-channels: In every round of the $f$-channel, each of its $n$ parties decides to either broadcast or not, and the channel outputs $f(m)$, where $m$ is the number of broadcasting parties.

Our first result is that the well studied beeping channel, where $f$ is the threshold-$1$ function, is not stronger than any other $f$-channel. To this end, we design a protocol over the $f$-channel and prove that any protocol that simulates it over the beeping channel blows up the round complexity by a factor of $\Omega(\log n)$. Our lower bound technique may be of independent interest, as it essentially generalizes the popular fooling set technique by exploiting a "local" relaxation of combinatorial rectangles.

Curiously, while this result shows the limitations of a noiseless channel, namely, the beeping channel, we are able to use it to show the limitations of the noisy version of many other channels. This includes the extensively studied single-hop radio network model with collisions-as-silence (CAS), which is equivalent to the $f$-channel with $f(m)=1$ iff $m=1$.

In particular, our second and main result, obtained from the first, shows that converting CAS protocols to noise resilient ones may incur a large performance overhead, i.e., no constant rate interactive code exists. To this end, we design a CAS protocol and prove that any protocol that simulates it over the noisy CAS model with correlated stochastic noise, blows up the round complexity by a factor of $\Omega(\log n)$. We mention that the $\Omega(\log n)$ overhead in both our results is tight.

Add acknowledgements and fixed a few typos.

Revision #1 Authors: Klim Efremenko, Gillat Kol, Dmitry Paramonov, Raghuvansh Saxena

Accepted on: 6th December 2022 16:26

Downloads: 118

Keywords:

Much of today's communication is carried out over large wireless systems with different input-output behaviors. In this work, we compare the power of central abstractions of wireless communication through the general notion of boolean symmetric $f$-channels: In every round of the $f$-channel, each of its $n$ parties decides to either broadcast or not, and the channel outputs $f(m)$, where $m$ is the number of broadcasting parties.

Our first result is that the well studied beeping channel, where $f$ is the threshold-$1$ function, is not stronger than any other $f$-channel. To this end, we design a protocol over the $f$-channel and prove that any protocol that simulates it over the beeping channel blows up the round complexity by a factor of $\Omega(\log n)$. Our lower bound technique may be of independent interest, as it essentially generalizes the popular fooling set technique by exploiting a "local" relaxation of combinatorial rectangles.

Curiously, while this result shows the limitations of a noiseless channel, namely, the beeping channel, we are able to use it to show the limitations of the noisy version of many other channels. This includes the extensively studied single-hop radio network model with collisions-as-silence (CAS), which is equivalent to the $f$-channel with $f(m)=1$ iff $m=1$.

In particular, our second and main result, obtained from the first, shows that converting CAS protocols to noise resilient ones may incur a large performance overhead, i.e., no constant rate interactive code exists. To this end, we design a CAS protocol and prove that any protocol that simulates it over the noisy CAS model with correlated stochastic noise, blows up the round complexity by a factor of $\Omega(\log n)$. We mention that the $\Omega(\log n)$ overhead in both our results is tight.

Added the list of references.

TR22-174 Authors: Klim Efremenko, Gillat Kol, Dmitry Paramonov, Raghuvansh Saxena

Publication: 4th December 2022 06:13

Downloads: 192

Keywords:

Much of today's communication is carried out over large wireless systems with different input-output behaviors. In this work, we compare the power of central abstractions of wireless communication through the general notion of boolean symmetric $f$-channels: In every round of the $f$-channel, each of its $n$ parties decides to either broadcast or not, and the channel outputs $f(m)$, where $m$ is the number of broadcasting parties.

Our first result is that the well studied beeping channel, where $f$ is the threshold-$1$ function, is not stronger than any other $f$-channel. To this end, we design a protocol over the $f$-channel and prove that any protocol that simulates it over the beeping channel blows up the round complexity by a factor of $\Omega(\log n)$. Our lower bound technique may be of independent interest, as it essentially generalizes the popular fooling set technique by exploiting a "local" relaxation of combinatorial rectangles.

Curiously, while this result shows the limitations of a noiseless channel, namely, the beeping channel, we are able to use it to show the limitations of the noisy version of many other channels. This includes the extensively studied single-hop radio network model with collisions-as-silence (CAS), which is equivalent to the $f$-channel with $f(m)=1$ iff $m=1$.

In particular, our second and main result, obtained from the first, shows that converting CAS protocols to noise resilient ones may incur a large performance overhead, i.e., no constant rate interactive code exists. To this end, we design a CAS protocol and prove that any protocol that simulates it over the noisy CAS model with correlated stochastic noise, blows up the round complexity by a factor of $\Omega(\log n)$. We mention that the $\Omega(\log n)$ overhead in both our results is tight.