1 For the information transmission a binary symmetric channel is used. There is also another noisy binary symmetric channel (feedback channel), and the transmitter observes without delay all the outputs of the forward channel via that feedback channel. The transmission of a nonexponential number of messages (i.e. the transmission rate equals zero) is considered. The achievable decoding error ex...

In this paper we present the first detailed theoretical analysis of the potential performance gains of adopting a BSC paradigm in 802.11 WLANs. Importantly, we also consider the multi-user channel aspect of a WLAN i.e. that transmissions are inherently broadcast in nature. We find that increases in network throughput of more than 100% are possible over a wide range of SNRs. These performance ga...

The particle decay ensuing from the reactions 86.0 MeV ' 0 + ' Sm and 239.1 MeV Ni + 'Mo was studied. These reactions each form ' Yb compound nuclei excited to = 54 MeV. Particle decay from compound nucleus producing reactions was selected by gating on the gamma-ray fold and the angular region of the particle emission. While there are no discernable differences in the dominant decay channels be...

Certain binary asymmetric channels, such as Zchannels in which one of the two crossover probabilities is zero, demand optimal ones densities different from 50%. Some broadcast channels, such as broadcast binary symmetric channels (BBSC) where each component channel is a binary symmetric channel, also require a non-uniform input distribution due to the superposition coding scheme, which is known...

A new approach for upper bounding the channel reliability function using the code spectrum is described. It allows to treat in a unified way both a low and a high rate cases. In particular, the earlier known upper bounds are improved, and a new derivation of the sphere-packing bound is presented.