Reduction of multipath effect through a critical scattering zone in microcell environments

C.A. López Miranda ^a and D.H. Covarrubias Rosales ^b

^a Wireless Communications Group CICESE RESEARCH CENTER Km. 107 Carretera Tijuana-Ensenada, Ensenada Baja California 22860, México, Tel (52+646) 1745050, Fax (52+646) 1750554,e-mail: clopez@cicese.mx Also, with the Universidad de Sonora, México.

^b Wireless Communications Group CICESE RESEARCH CENTER, e-mail: dacoro@cicese.mx

Abstract

In this work, we investigate a critical region (CR) in microcell elliptical environments, an area between the mobile and the base station (BS) containing multipaths whose angles and times of arrival possess the acceptable angle and delay spreads of the channel. The focus of the paper is to estimate the theoretical rates of multipath reduction expected from the CR. These rates illustrate the convenience of adjusting or not the antenna's beamwidth (aperture) according to the angle spread. Also, to confirm the model's results; the angle and time of arrival statistics deduced from the elliptical model are validated through simulation. Results closely agree with theoretical values expected from the model.

Keywords: Multipath effect; microcell; critical region; statistical analysis; antenna aperture.

Resumen

En este trabajo, investigamos una región crítica (CR) en entornos elípticos microcelulares, una área entre el móvil y la estación base (BS) que contiene las multitrayectorias cuyos ángulos y tiempos de arribo poseen un esparcimiento angular y temporal aceptable del canal. El trabajo se enfoca en estimar la proporción teórica de la reducción de multitrayectorias esperadas de la RC. Estas razones ilustran la conveniencia o no de ajustar el ancho de haz de la antena (apertura) de acuerdo al esparcimiento angular. Para confirmar los resultados del modelo, las estadísticas generadas a través del modelo elíptico para el ángulo y tiempo de arribo son validadas por simulación. Los resultados concuerdan con los valores teóricos esperados del modelo.

Descriptores: Angle spread; elliptical model; microcell; multipath.

PACS: 41.20.Jb; 42.68.Ay; 42.25.Fx

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Acknowledgments

This work was supported by the Mexican National Science and Technology Council under Grant U39514-Y. Also, the author would like to thanks to the Universidad de Sonora that supports financially C.A. Lopez doctoral program at CICESE research center.

References

1. Ramakrishna Janaswamy, IEEE Trans. On Wireless Communications 1 (2002) 488.         [ Links ]

2. R. Ertel and J. Reed, Proc. IEEEJSAC 17 (1999) 1829.         [ Links ]

3. J.C. Liberti Jr. and T.S. Rappaport, IEEE VTC xxx (1996) 844.         [ Links ]

4. P. Petrus, J.H. Reed, and T.S. Rappaport, IEEE Trans. On Comms 50 (2002) 495.         [ Links ]

5. Ramakrishna Janaswamy, Radiowave Propagation and Smart Antennas for Wireless Communications (Kluwer Academic Publishers, 2001).         [ Links ]

6. J.C. Liberti Jr. and T.S. Rappaport, Smart Antennas for Wireless Communications: IS-95 and Third Generation CDMA Applications (Prentice Hall PTR, 1999).         [ Links ]

7. C. Cheon, G. Liang, and H.L. Bertoni, IEEEJSAC 19 (2001) 2191.         [ Links ]

8. R.B. Ertel, P. Cardieri, K.V. Sowerby, T.S. Rappaport, and J.F. Reed, IEEE Personal Communication xxx (1998) 10.         [ Links ]