German Aerospace Agency (DLR), Fraunhofer FOKUS.cats, and Tesat-Spacecom have designed a future multimedia ATMbased LEO satellite network. Part of the development was an adaptive MAC and FEC scheme which are presented in this paper. The MAC protocol reduces contention while the FEC scheme guarantees a maximum ATM cell error rate of 10−6 even in the presence of rain. FEC and MAC were implemented...

The use of frequencies well into the extra high frequency (EHF) band (30–300 GHz) is a key element in 5G and beyond technologies. Rain attenuation major impairment affecting terrestrial radio links this band. In absence enough experimental measurements, rain can be estimated by using physical models radiowave scattering raindrops combined with information about raindrop size distributions (DSD)...

Recent research has demonstrated the value of polarimetric measurements for the correction of rain-path attenuation at X-band radar frequency and the estimation of rain parameters including drop-size distributions (DSD). The standard remotely-sensed precipitation products, from large operational Sor C-band network radars, have spatial resolutions that are often too coarse to reveal hydrological...

German Aerospace Center (DLR), Fraunhofer FOKUS.cats, and Tesat-Sapcecom have designed a future multimedia ATM-based LEO satellite network. Part of the development was an adaptive MAC and FEC scheme which are presented in this paper. The MAC protocol reduces contention while the FEC scheme guarantees a maximum ATM cell error rate of 10 even in the presence of rain. FEC and MAC were implemented ...

Abstract In the network planning and design of terrestrial earth-space communication links, slant path attenuation caused by rain its associated strong winds is interest. Rain causes severe link degradation to radio links absorbing parts or whole signal during propagation. This study predicts in three (3) Northern Nigerian zones using International Telecommunications Unions (ITU-R) model for 10...

Inversion algorithms for ground-based microwave radiometric retrieval of surface rain-rate, integrated cloud parameters, and slant-path attenuation are proposed and tested. The estimation methods are trained by numerical simulations of a radiative transfer model applied to microphysically-consistent precipitating cloud structures, representative of stratiform and convective rainy clouds. The di...

Existing satellite systems used QPSK modulation with concatenated Convolutional and Reed-Solomon error correction codes as per the DVB standard. In addition, the RF links are run using fixed margins with the size of the margin dependent upon the maximum rain attenuation predicted for the service area. One way to increase the system data throughput is to manage each user terminal separately and ...

Local multipoint distribution service (LMDS) is a broadband wireless access technology that operates at microwave frequencies above 25 GHz. However, severe attenuation due to excessive rain in tropical regions presents a major challenge for achieving reliable communication over such frequencies. To overcome this problem, cell-site diversity (CSD) can be deployed in cellulartype LMDS networks. I...

The Advanced Communication Technology Satellite (ACTS) communications system operates in the Ka frequency band. ACTS uses multiple, hopping, narrow beams and very small aperture terminal (VSAT) technology to establish a system availability of 99.5% for bit-error-rates of 5x 10 or better over the continental United States. In order maintain this minimum system availability in all US rain zones, ...