By Giovanni Giambene
ISBN-10: 0387368973
ISBN-13: 9780387368979
This e-book offers major wisdom on cutting edge radio source administration schemes for satellite tv for pc communique structures that make the most reduce layer adaptivity and the data of layer three IP QoS help and delivery layer habit. The booklet integrates abilities contemplating the entire components of procedure layout: propagation facets, radio source administration, entry protocols, community protocols, delivery layer protocols, and extra, to hide either broadband and cellular satellite tv for pc systems.
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Additional info for Satellite communication systems cross-layer design
Sample text
As for the reception in a mobile environment, the signal can be faded and enhanced by these fluctuations. Channel losses In satellite networks, Bit Error Rate (BER) is very high, due to the abovementioned atmospheric effects. The quality of the satellite link can be subject to rapid degradation that can cause long sequences of erroneous bits. These burst errors cause an on-off behavior for the channel. , part of the available capacity is spent in sending redundancy bits). Satellite lifetime Satellites have an average life span due to the components’ ageing process, the effect of radiations, the necessity of new components, etc.
A typical choice for the super-frame length is 500 ms that also corresponds to the TBTP and CR transmission periodicity. A possible value for the frame length is 50 ms. , VoIP and videoconference); Chapter 1: INTRODUCTION TO SATELLITE COMMUNICATIONS 23 Fig. 6: Delay contributions in the process to allocate resources to RCSTs. , FTP application); The Jitter Tolerant Priority traffic class. , service classes) [15]. , RT, VR-RT, VR-JT, JT); each queue should be served with a capacity allocation method (or a combination of them).
The elevation angle at the edge of coverage. 3. Atmospheric effects The effects of atmosphere (subdivided in troposphere and ionosphere) can be summarized as follows [2]: Chapter 1: INTRODUCTION TO SATELLITE COMMUNICATIONS 11 Fig. 3: RT Dmax level curves in ms for LEO satellite constellations in the plane Minimum elevation angle [in degrees] versus LEO satellite constellation altitude [in km]. • • • Atmospheric gasses. 3 GHz -Ka band- and at 60 GHz -V band-, respectively due to water vapor and molecular oxygen); whereas, above 150 GHz, the effect of water vapor is dominant.