Coherence bandwidth characterization in an urban microcell at 62.4 GHz

Abstract

Results of experiments made at 62.4 GHz in an urban mobile radio environment to characterize the coherence bandwidth are presented. The correlation coefficients between signal envelopes separated in frequency are measured and expressed as functions of distance from the base station. Due to the high variation of this coefficient with distance and in order to provide accurate estimates of the coherence bandwidth in the microcell, the correlation coefficient has to be measured over large sections. Two methods to calculate the coherence bandwidth are presented and compared. It is shown that estimating this parameter from the frequency correlation function obtained at each position may yield incorrect results. The coherence bandwidths for correlation levels of 0.5, 0.7, and 0.9 are given. A ray-tracing tool has been used to assist in interpreting experimental results.

Coherence bandwidth in a 1.8-GHz urban mobile radio channel

“…3 is the cumulative distribution of these correlation coefficients calculated for the fifteen values of f ' . In a 60-GHz coherence bandwidth field trial carried out in [4] it has been already reported the same behavior observed here, i.e. the range over which the correlation coefficient varies becomes wider as the frequency separation increases and the correlation between the envelopes decreases with increasing frequency spacing.…”

“…The correlation coefficient expressed as function of frequency separation is defined as the frequency correlation function R( ) f ' [3]. This function can be calculated either by measuring the correlation coefficient between two frequencyspaced envelopes transmitted over the mobile channel [4], [5] or by measurements of channel impulse response using pseudo-random sequence correlation techniques [2], [6], [7]. The latter technique is based on computing the frequency correlation function by evaluating the Fourier transform of the power delay profile of channel impulse responses.…”

Indoor Channel Measurements and Characterization at 60 GHz for Wireless Local Area Network Applications

“…Many researchers have reported measurement results around 60 GHz in an indoor [3], [4] and an outdoor environment [5], [6] to assist the channel modeling. Indoor propagation should also include information concerning Manuscript path loss for line-of-sight (LoS) and non-line-of-sight (NLoS) topographies, moreover, fading statistics in a physically static environment as well as statistics concerning the temporal variations engendered by the movement of surroundings and humans.…”

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

“…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.…”