Recent investigations have shown sum capacity results within a constant bit-gap for several channel models, e.g. the two-user Gaussian interference channel (G-IC), k-user G-IC or the Gaussian X-channel. This has motivated investigations of interferencelimited multi-user channels, for example, the Gaussian interfering multiple access channel (G-IMAC). Networks with interference usually require t...

The impact of a noisy Gaussian channel on wide range non-Gaussian input states is studied in this work. nonclassical nature the states, both and output, developed by studying corresponding photon statistics quasi-probability distributions. It found that addition has more robust quantum mechanical properties as compared to subtraction case. threshold value noise parameter transition from partial...

by Utsaw Kumar The presence of inexpensive and powerful sensing and communication devices has made it possible to deploy large scale distributed systems for a variety of applications. Interactions among different components of such a system include communication of information and controlling dynamical processes, among others. Thus, it is important to blend ideas from information theory and con...

Recently, there has been focus on determining the conditions under which the data processing inequality for quantum relative entropy is satisfied with approximate equality. The solution of the exact equality case is due to Petz, who showed that the quantum relative entropy between two quantum states stays the same after the action of a quantum channel if and only if there is a reversal channel ...

We provide a counterexample to Cover’s conjecture that the feedback capacity CFB of an additive Gaussian noise channel under power constraint P be no greater than the nonfeedback capacity C of the same channel under power constraint 2P , i.e., CFB(P ) C(2P ). Index Terms|Additive Gaussian noise channels, channel capacity, conjecture, counterexample, feedback.

We determine the feedback capacity region of a two user Gaussian multiple access channel (MAC) with multiple antennas at the base station and a single antenna at each user. The vector MAC and broadcast channels (BC) with a single antenna at the base station and multiple antennas at each user are shown to be equivalent to scalar MACs and BCs, respectively. We also determine the capacity enhancem...

Costa’s “writing on dirty paper” capacity result establishes that full state pre-cancellation can be attained in Gel’fand-Pinsker channel with additive state and additive Gaussian noise. The “carbon copy onto dirty paper” channel is the extension of Costa’s model to the compound setting: M receivers each observe the sum of the channel input, Gaussian noise and one of M Gaussian state sequences ...

We consider the problem of distributed joint source-channel coding of correlated Gaussian sources over a Gaussian Multiple Access Channel (GMAC). There may be side information at the decoder and/or at the encoders. First we specialize a general result in [20] to obtain sufficient conditions for reliable transmission over a Gaussian MAC. This system does not satisfy the source-channel separation...

The capacity region of the one-sided Gaussian interference channel is established in the weak interference regime. To characterize this region, a new representation of the HanKobayashi inner bound for the one-sided Gaussian interference channel is first given. Next, a new outer bound on the capacity region of this channel is introduced which is tight in the weak interference regime. This is the...