Rover-to-Orbiter Communication in Mars: Taking Advantage of the Varying Topology
| Autor: | Songze Li, A. Salman Avestimehr, David T. H. Kao |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
FOS: Computer and information sciences
Computer science Gaussian Computer Science - Information Theory 0211 other engineering and technologies Time division multiple access Throughput 02 engineering and technology Topology Network topology Upper and lower bounds law.invention Orbiter symbols.namesake law 0202 electrical engineering electronic engineering information engineering Ergodic theory Fading Electrical and Electronic Engineering Rayleigh scattering 021101 geological & geomatics engineering Computer Science::Information Theory Information Theory (cs.IT) 020206 networking & telecommunications Mars Exploration Program Telecommunications network Channel state information symbols Communication channel |
| Zdroj: | ISIT |
| Popis: | In this paper, we study the communication problem from rovers on Mars' surface to Mars-orbiting satellites. We first justify that, to a good extent, the rover-to-orbiter communication problem can be modelled as communication over a $2 \times 2$ X-channel with the network topology varying over time. For such a fading X-channel where transmitters are only aware of the time-varying topology but not the time-varying channel state (i.e., no CSIT), we propose coding strategies that code across topologies, and develop upper bounds on the sum degrees-of-freedom (DoF) that is shown to be tight under certain pattern of the topology variation. Furthermore we demonstrate that the proposed scheme approximately achieves the ergodic sum-capacity of the network. Using the proposed coding scheme, we numerically evaluate the ergodic rate gain over a time-division-multiple-access (TDMA) scheme for Rayleigh and Rice fading channels. We also numerically demonstrate that with practical orbital parameters, a 9.6% DoF gain, as well as more than 11.6% throughput gain can be achieved for a rover-to-orbiter communication network. 13 pages, 6 figures. Accepted by IEEE Transactions on Communications |
| Databáze: | OpenAIRE |
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