On Channel Output Feedback in Deterministic Interference Channels

Sahai, Achaleshwar
Aggarwal, Vaneet
Yüksel Turgut, Ayşe Melda
Sabharwal, Ashutosh
In this paper, we study the effect of channel output feedback on the sum capacity in a two-user symmetric deterministic interference channel. We find that having a single feedback link from one of the receivers to its own transmitter results in the same sum capacity as having a total of 4 feedback links from both the receivers to both the transmitters. Hence, from the sum capacity point of view, the three additional feedback links are not helpful. We also consider a half-duplex feedback model, where the forward and the feedback resources are symmetric and time-shared. Surprisingly, we find that there is no gain in sum-capacity with feedback in a half-duplex feedback model, when interference links have more capacity than direct links.
IEEE Information Theory Workshop (ITW)


On the Number of Bins in Equilibria for Signaling Games
Sarıtaş, Serkan; Gezici, Sinan; Linder, Tamas; Yuksel, Serdar (2019-01-01)
We investigate the equilibrium behavior for the decentralized quadratic cheap talk problem in which an encoder and a decoder, viewed as two decision makers, have misaligned objective functions. In prior work, we have shown that the number of bins under any equilibrium has to be at most countable, generalizing a classical result due to Crawford and Sobel who considered sources with density supported on [0, 1]. In this paper, we refine this result in the context of exponential and Gaussian sources. For expone...
Capacity of All Nine Models of Channel Output Feedback for the Two-User Interference Channel
Sahai, Achaleshwar; Aggarwal, Vaneet; Yüksel Turgut, Ayşe Melda; Sabharwal, Ashutosh (2013-11-01)
In this paper, we study the impact of different channel output feedback architectures on the capacity of the two-user interference channel. For a two-user interference channel, a feedback link can exist between receivers and transmitters in nine canonical architectures (see Fig. 3), ranging from only one feedback link to four feedback links. We derive the exact capacity region for the symmetric deterministic interference channel and the constant-gap capacity region for the symmetric Gaussian interference ch...
Adaptive modulation for completion time minimization in wireless broadcast networks
Yüksel Turgut, Ayşe Melda; Genc, Yasin (2017-01-01)
In this work we study the effect of hierarchical modulation on completion time minimization in wireless broadcast channels. Time needed to transmit all bits intended for a particular user is defined as its completion time. In this work we investigate minimizing the maximum completion time over all users in a broadcast channel using hierarchical modulation. We compare time division, opportunistic scheduling, and three different adaptive modulation schemes: rate adaptive hierarchical modulation assisted trans...
On the Implementation of Optimal Receivers for LFM Signals using Fractional Fourier Transform
Candan, Çağatay (2008-05-30)
We present a novel receiver structure for the detection and parameter estimation of linear frequency modulated signals. The proposed structure is based on the relations between the fractional Fourier transform and the ambiguity function. It has been shown that the optimal ML receiver, which is the peak detector in the ambiguity plane, can be implemented at a reduced search complexity with the proposed method. The proposed method uses two 1-dimensional search operations in two different fractional Fourier do...
Blind channel estimation in OFDM systems
Ayas, Mehmet Akif; Diker Yücel, Melek; Department of Electrical and Electronics Engineering (2015)
In this thesis, we have studied blind channel estimation methods for single-input-multiple-output (SIMO) orthogonal frequency division multiplexing (OFDM) systems in time and frequency domain, in which the cross relation between the channel gains and a single snapshot of the received signal on each subcarrier is utilized. We have performed blind channel estimation for uncorrelated and correlated Rayleigh fading channel pairs using time and frequency methods in OFDM systems with one-transmitting, two-receivi...
Citation Formats
A. Sahai, V. Aggarwal, A. M. Yüksel Turgut, and A. Sabharwal, “On Channel Output Feedback in Deterministic Interference Channels,” presented at the IEEE Information Theory Workshop (ITW), Taormina, İtalya, 2009, Accessed: 00, 2022. [Online]. Available: https://hdl.handle.net/11511/96471.