INFOSTATIONS RADIO CHANNEL MODELING A. Domazetovic, L. J. Greenstein, N. Mandayam and I. Seskar October 29, 2001

Infostations-A system of sweet spots Cellular systems Infostations - Power (>=1W) - Low power (~100mW) - Low bit rates - Very high bit rates - Connectivity always, - Brief connections (~seconds), everywhere localized - Narrowband - Wideband (e.g. UNII bands, 100MHz) - Large distances (~ km) - Short range (<20m)

Infostations-A system of sweet spots Cellular systems Infostations - Power (>=1W) - Low power (~100mW) - Low bit rates - Very high bit rates - Connectivity always, - Brief connections (~seconds), everywhere localized - Narrowband - Wideband (e.g. UNII bands, 100MHz) - Large distances (~ km) - Short range (<20m)

W z d trajectory Offset (1.5m) Scenario 1: Open Roadway with Trees

Two types of Continuous Waveform measurements: - Passing by the antenna - Fixed antenna positions Two antenna types used: - Omnidirectional (azimuth plane) deg. Directional (azimuth plane) Measurements

W z d trajectory Offset (1.5m) Scenario 1: Open Roadway with Trees

   x e j Two-Ray Model for Scenario 1:   - log-normal process, dB  approximately linearly increasing in distance - antenna gains in direction of rays +

W z d Offset (1.5m)   - Log-normal Process

Status  Performing measurements for other user scenarios (streets, parking lots, entering the building, …)  Developing models for them (3-rays, 4-rays, …)  Further analysis of observed random processes  Assembling equipment for direct RF-pulse channel sounding  Performing direct RF-pulse measurements

Scenario 2: Road with Buildings on Each Side Four ray propagation model