This paper presents a new physical modelling approach for wireless systems with multiple antennas. The fundamental problem of modelling the communications channel if we are given an arbitrary spatial volume for transmitting, an arbitrary spatial volume for receiving, and a set of scattering bodies is studied. We show how to calculate the number of communication modes, both for direct (point-to-...

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Discrete Memoryless Channels . . . . . . . . . . . . . . . . . . . . . . . . 2 The Binary Symmetric Channel . . . . . . . . . . . . . . . . . . . . . . . 4 Secrecy Capacity of a Channel . . . . . . . . . . . . . . . . . . . . . . . . 9 Secret Key Agreement Rate by Public Discussion . . . . . . . . . . . . . 17 On...

This paper summarizes our 2x2 Multiple-Input Multiple-Output (MIMO) fixed wireless outdoor propagation measurements at 2.48GHz conducted in the suburban residential areas of San Jose, California. We report on various channel characteristics such as path loss, Ricean K-factor, Cross-Polarization-Discrimination (XPD) and channel capacity. We present simple models for these characteristics, focusi...

Photoreceptors measure and communicate information about visual stimuli to other neurons. In this process, the visual signal is converted between many di!erent physical states. We present a communication channel model that describes transmission and degradation of the visual signal in the blow#y photoreceptor cell. The model is a cascade of linear systems and noise sources; these elements are d...

Molecular communication is a new nano-scale communication paradigm that enables nanomachines to communicate with each other by emitting molecules to their surrounding environment. Nanonetworks are also envisioned to be composed of a number of nanomachines with molecular communication capability that are deployed in an environment to share specific molecular information such as odor, flavour, li...

Covert channels aim to hide the existence of communication between two or more parties. Such channels typically utilise pre-existing overt data transmissions to carry hidden messages. Recently, Murdoch proposed a temperature-based covert channel where information is transmitted by remotely inducing and measuring changes of temperature of an intermediate/target host. The channel was invented mai...

Two new classes of quantum channels, which we call more capable and less noisy, are introduced. The more capable class consists of channels such that the quantum capacities of the complementary channels to the environments are zero. The less noisy class consists of channels such that the private capacities of the complementary channels to the environment are zero. For the more capable class, it...

—In mobile communication systems using CDMA common channels needed for proper network operation share the same resource as the dedicated channels for data transmission. However the 3GPP standard does not specify the amount of transmit power for the common channels. So it is up to the network operator to assign appropriate transmit powers to the various common channels. In this paper we study th...

In this paper the analysis for WCDMA downlink capacity is presented for a real service environment at Yeouido, Seoul, Korea which is considered as a typical high rise building environment. Ray-tracing technique is used to predict site-specific sector averaged pathlosses not only from the desired node B but also from undesired node Bs to scattered receiver locations in a given cell. Total requir...

In part I, we reviewed how Shannon’s classical notion of capacity is not sufficient to characterize a noisy communication channel if the channel is intended to be used as part of a feedback loop to stabilize an unstable scalar linear system. While classical capacity is not enough, a sense of capacity (parametrized by reliability) called “anytime capacity” is both necessary and sufficient for ch...