A new three dimensional (3D) ray-tracing propagation prediction tool (3D MRT-1) is being developed for characterisation of wideband mobile radio channel. It calculates the amplitude, phase, angle-of-departure (AOD), angle-of-arrival (AOA), optical path length and received field strength for each valid reflected or diffracted ray path. It also constructs the power delay profile (PDP) and extract...

AbstractField test of space-time (ST) equalizers for combating inter-symbol interference (ISI) at base station, was conducted in microand macro-cell environments in central Tokyo area. Test results indicate that the ST equalizers provide significant better bit error rate (BER) than an array processor alone dose, due to both space and path diversity while suppressing long-delayed path. Furthermo...

To designing higher-speed digital mobile communication systems, we must predict the multi-path propagation characteristics more accurately. Available path number and delay spread are effective indicators that make it easy to evaluate multi-path propagation. In this paper, we propose a novel delay profile model that can predict the available path number and the delay spread accurately due to its...

Non-coherent signal with unknown delay and Doppler is recovered by Gabor Division/Spread Spectrum System (GD/S). A transmitted signal in GD/S is expressed by a Gabor expansion whose expansion coefficient is a product of time domain (TD) and frequency domain (FD) spread spectrum (SS) codes. A receiver in GD/S employs multiple TD integrators with TD SS codes and a prescribed delay and FD integrat...

This paper presents an experimental characterization of millimeter-wave (mm-wave) channels in the 6.5 GHz, 10.5 GHz, 15 GHz, 19 GHz, 28 GHz and 38 GHz frequency bands in an indoor corridor environment. More than 4,000 power delay profiles were measured across the bands using an omnidirectional transmitter antenna and a highly directional horn receiver antenna for both co- and cross-polarized an...

Introduction: There is increasing interest [1], [2], [3], [4] in space-time coding for multiple input multiple output (MIMO) frequency selective wireless channels. This paper addresses space-time code design for such channels from a single carrier perspective. We derive code construction criterion for exploiting full spatio-temporal diversity in the channel. We analyze the delay diversity code ...

Empirical results characterizing the joint statistical properties of the local azimuth spread (AS), the local delay spread (DS), and the shadow (slow) fading component are presented. Measurement data from typical urban, bad urban, and sub urban (SU) environments have been analyzed. It is found that a log-normal distribution accurately fits the distribution function of all the investigated param...

We consider a two-dimensional model of cell-to-cell spread of HIV-1 in tissue cultures, assuming that infection is spread directly from infected cells to healthy cells and neglecting the effects of free virus. The intracellular incubation period is modeled by a gamma distribution and the model is a system of two differential equations with distributed delay, which includes the differential equa...

This paper presents results of wide-band path loss and delay spread measurements for five representative microcelMar environments in the San Francisco Bay area at 1900 MHz. Measurements were made with a wide-band channel sounder using a 100-ns probing pulse. Base station antenna heights of 3.7 m, 8.5 m, and 13.3 m were tested with a mobile receiver antenna height of 1.7 m to emulate a typical m...