In this paper, we study the transport capacity – the transported bit-meters per symbol period per node, and the space time spectrum power efficiency – the transported bit-meters per Hz per second per square meter per watt for large wireless CDMA ad hoc networks. The node density and processing gain tend to infinity with their ratio kept a constant. The limiting networks consist of infinitely de...

Many digital steganographic systems employ the capacity of an additive white Gaussian noise (WGN) channel as a performance metric. We present results that show that this capacity metric understates the capacity potential of these systems and propose a more accurate measure based on the arbitrary noise channel. This measure is compared to the capacity of the additive WGN channel and the performa...

In this paper, we investigate the effect of output quantization on the secrecy capacity of the binary-input Gaussian wiretap channel. As a result, a closed-form expression with infinite summation terms of the secrecy capacity of the binary-input Gaussian wiretap channel is derived for the case when both the legitimate receiver and the eavesdropper have unquantized outputs. In particular, comput...

In this paper, a new and general version of Gaussian channel in presence of two-sided state information correlated to the channel input and noise is considered. Determining a general achievable rate for the channel and obtaining the capacity in a non-limiting case, we try to analyze and solve the Gaussian version of the Cover-Chiang theorem -as an open problemmathematically and information-theo...

The capacity of a random-phase additive white Gaussian noise (AWGN) channel, referred to as noncoherent channel, is investigated in the case of a transmission of N information symbols. The non-Gaussianity of the capacity-achieving distribution is shown and a lower bound on the channel capacity is derived. For increasing values of the number of transmitted symbols N , the capacity of a noncohere...

In this channel,we study rate region of a Gaussian two-way diamond channel which operates in half-duplex mode. In this channel, two transceiver (TR) nodes exchange their messages with the help of two relay nodes. We consider a special case of the Gaussian two-way diamond channels which is called Compute-and-Forward Multiple Access Channel (CF-MAC). In the CF-MAC, the TR nodes transmit their mes...

The capacity region of the interference channel inwhich one transmitter non-causally knows the message of theother, termed the cognitive interference channel, has remainedopen since its inception in 2005. A number of subtly differingachievable rate regions and outer bounds have been derived,some of which are tight under specific conditions. In thiswork we present a new u...

The quantum capacity of thermal noise channel (which is addressed as Gaussian quantum channel before) is studied, it turns out to be the maximum of the coherent information of a single use of the channel. The quantum capacity is achieved when the input state is a thermal noise state with infinitive energy. The capacity is achievable with quantum error-correction code. The quantum capacities of ...

In this paper, we investigate the ergodic capacity of fast fading Gaussian multiuser channels when only the statistics of the channel state are known at the transmitter. In general, the characterization of capacity regions of multiuser channels with only statistical channel state information at the transmitter (CSIT) is open. Instead of directly matching achievable rate regions and the correspo...

In this summary, the additive Gaussian noise channel subject to two types of constraints: (1) physical channel constraints, and (2) first-order cost constraints is considered. This channel is shown to have a unique capacity achieving input distribution, which is “discrete” in nature. A necessary and sufficient condition for the capacity achieving distribution is also derived. December 22, 2002 ...