Achmad Mauludiyanto

An autoregressive model for simulation of time-varying rain rate

An autoregressive (AR) model for computer generation of time-varying lognormally distributed rainfall rate is presented. The AR coefficients are derived from rain rate statistics and autocorrelation function obtained from measurement. Results from computer simulations are found to fit well with rain rate data from Barcelona.

Statistical of rain rates for wireless channel communication in Surabaya

This paper present an initial result of research on channel modeling of millimeter wave wireless channel in Indonesia considering the impact of rain rate of rainfall due to microwave attenuation, fading and wave polarization propagations millimeter in 30 GHz.. The channel model developed in time series (time domain) by assuming channel as a random variable. The rain data is based on retrieval result from Parsivel equipment with software ASDO recorded data in online manner. The statistical value of rain, i.e. mean, Varian, autocorrelation, and auto ovarian from rainfall is modeled. For goodness-of-fit test used Kolmogorov-Smirnov (K- S) test for continuous distributions and to generate long-term rain- rate model, the of Autoregressive (AR) method, Moving Average (MA), and Autoregressive Moving Average (ARMA) are applied on rainfall data measured in ITS Surabaya.

Measurement of Time-Varying Rainfall Rate in Surabaya and Estimation of Attenuation Statistics by Synthetic Storm Technique

Measurement of time-varying rain rate has been performed in Surabaya using an optical disdrometer. The results suggest that consecutive samples of rain rate in Surabaya possesses higher correlation than those measured in such non-tropical sites like Barcelona. Attenuation statistics obtained from a simulation study by means of the synthetic storm technique applied to the rain rate time series measurements agree with those predicted by ITU-R only for links of 1-2 km length at outage probabilities in the range of 0.01-0.1%. The simulation results also show that the use of daily and monthly averages of wind velocity does not yield significant differences in the attenuation statistics.

Simulation of tropical rain attenuation for evaluation of millimeter-wave wireless network

The simulation of rain attenuation, fade slope, and fade duration overview from 3 models i.e. AR (autoregressive) model, SST (synthetic storm technique) with east-west (E-W) orientation and south-north (S-N) orientation. The simulation uses the data of rainfall measurement in Surabaya during 3 months. The biggest value of the result of the simulation for attenuation and fade slope happens in AR model, Meanwhile the value of fade duration happens in SST E-W model. Worst condition or upper bound in planning millimeter-wave wireless network if we evaluate attenuation and fade slope are given by AR or SST S-N model, but if we evaluate fade duration SST E-W model gives the worst case.

A measurement system for space-time variation of rainfall rate and millimeter-wave specific attenuation in Indonesia

A system designed to measure the space-time variation of rainfall rate R (mm/h) and specific attenuation Y (dB/km) is presented. The design constraints include a limited budget and a desired capability of capturing realistic propagation conditions expected to occur in millimeter-wave wireless systems with short links operating in a tropical region. The system consists of a disdrometer, a network of rain gauges, and a 29 GHz transmitter-receiver set, all to operate in a small campus area. The rain gauges will measure the distribution and space-time variation of rain rate. The disdrometer will measure drop size distributions necessary to derive the power-law coefficients for R-to-Y conversion, to be verified against measurements of attenuation on the 29 GHz link.

Analysis of tropical attenuation statistics using synthetic storm for millimeter-wave wireless network design

Results of rain attenuation statistics measurement in Surabaya using an optical disdrometer is reported. Rain attenuation statistic obtained simulation of the synthetic storm technique applied to the rain rate time series measurements closely with results obtained from ITU-R P.530-10 for outage probabilities 0.01-0.1%. For an outage probabilities less than 0.01% that predicted by SST have large rain attenuation than ITU-R P.530-10. The simulation results show that the incident direction of storm velocity and the assumption link location, influence rain attenuation statistic.

Results from development of methods for mitigating the impact of tropical rain attenuation on millimeter-wave broadband wireless access

This paper provides a report on a continuing research project on the development of rain attenuation mitigation techniques for millimeter-wave wireless access to be implemented in tropical regions characterized by heavy rain events. The study is divided into three facets, namely, modeling of rain attenuation, designing of adaptive mitigation schemes, and cross-layer optimization of millimeter-wave broadband access network. The reported results are those obtained since 2009 comprising progresses in the three facets.