Daniela Tuninetti

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In next generation wireless communication systems, packet-oriented data transmission will be implemented in addition to standard mobile telephony. We take an information-theoretic view of some simple protocols for reliable packet communication based on \Hybrid-ARQ", over a slotted multiple access Gaussian channel with fading and study their through-put(More)
We consider multiaccess, broadcast, and interference channels with additive Gaussian noise. Although the set of rate pairs achievable by time-division multiple access (TDMA) is not equal to the capacity region, the TDMA achievable region converges to the capacity region as the power decreases. Furthermore, TDMA achieves the optimum minimum energy per bit.(More)
This paper studies the throughput performance of hybrid automatic repeat request (HARQ) protocols over block fading Gaussian channels. It proposes new protocols that use the available feedback bit(s) not only to request a retransmission, but also to inform the transmitter about the instantaneous channel quality. An explicit protocol construction is given(More)
  • D. Tuninetti
  • 2007 IEEE International Symposium on Information…
  • 2007
This work studies cooperative communication strategies for Interference Channels with Generalized Feedback (IFC-GF). IFC-GF models wireless peer-to-peer networks where several source-destination pairs share the same channel and, because of the broadcast nature of the wireless channel, each transmission can be overheard by the other users. In this model, the(More)
An Interference Channel with Generalized Feedback (IFC-GF) models a wireless network where the sources can sense the channel activity. The signal overheard from the channel provides information about the activity of the other sources and thus furnishes the basis for cooperation. This two-part paper studies achievable strategies (Part I) and outer bounds(More)
In this work, we study coding over a class of two-user broadcast channels (BCs) with additive white Gaussian noise and multiplicative fading known at the receivers only. Joint decoding of low-density parity-check (LDPC) codes is analyzed. The message update rule at the mapping node linking the users' codes is derived and is found to exhibit an interesting(More)
The cognitive interference channel is a two-user interference channel in which one transmitter is non-causally provided with the message of the other transmitter. This channel model has been extensively studied in the past years and capacity results have been proved for certain classes of channels. This paper presents new inner and outer bounds for the(More)
In this paper, we study the throughput performance of repetition protocols over block fading channels. We show that, by allocating different power to different retransmissions, the throughput can be improved, especially at high SNR. We also show that, if one bit of available feedback is used to signal decoding failure and channel condition, then great(More)