Statistical modeling of the indoor radio channel at 10 GHz through propagation measurements .I. Narrow-band measurements and modeling

Abstract

The aim of this paper is to report the results of a propagation measurement experiment to reach a statistical model of the indoor radio channel at 10 GHz using directive antennas at both terminals. The measurements were conducted on a floor of a university building. The distribution of the received fading envelope was tested to fit the Rayleigh and Rician distributions, but were not satisfactory. The Nakagami distribution was found to give an excellent fit with its parameter, , depending on the separation between transmitter and receiver. The results of the level crossing rate (LCR) and the average duration of fades (ADFs) confirmed this result. The effect of using reception diversity to improve the quality of the received fading signal was tested. Frequency, space and polaraization diversity were applied and the cross correlation between the envelopes of the received fading signals (magnitude and power) in the diversity branches was evaluated. The diversity gain achieved was also evaluated. The effect of three different combining techniques (selection, equal gain and maximal ratio) and the effect of applying a global or moving means to the recorded data was studied.

MEDICIÓN DE ANCHO DE BANDA DE COHERENCIA Y DISPERSIÓN TEMPORAL EN LA BANDA DE 2.4 GHz EN AMBIENTES INTERIORES

“…Con ello se completan 30 mediciones por giro en aproximadamente cinco minutos. La separación entre cada punto de medición es de alrededor de 12 cm, que es aproximadamente una longitud de onda para 2.4 GHz, lo cual garantiza que las mediciones obtenidas están no correlacionadas entre si [1], [7]. El sistema receptor está situado sobre un trípode de aproximadamente 1.5 m de altura, y la antena transmisora se encuentra a una altura de alrededor de 2 m.…”

“…En este trabajo se calcula B c para un nivel de correlación c de 0.9 y 0.7. Otros autores [7], [10] que han medido la correlación en frecuencia utilizan como método de medición dos portadoras de igual amplitud, pero separadas en frecuencia. Calculan la correlación cruzada de las envolventes de la señales a medida que la separación en frecuencia aumenta.…”

Wireless Channel Model with Markov Chains Using MATLAB

“…Although they do not describe the behavior of the sent signal in a complete way, they give a good approximation of the conditions of the channel in a certain moment. (Nakagami, 1960;Abouraddy & Elnoubi, 2000) The main statistical channels and their corresponding pdf are:…”

The Asymmetrical n-k Distribution

“…In particular, transmitter and receiver were placed within buildings (indoor propagation), and the procedure used is that of the already widely reported in the literature [10].…”