## Further improvements » History » Version 12

*RIBAS MACHADO, Ederson , 03/22/2015 04:27 PM *

1 | 1 | SERRA FONT, Anna | h1. Further improvements |
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2 | 1 | SERRA FONT, Anna | |

3 | 1 | SERRA FONT, Anna | As we have seen, the link budget equations can become very complex and, during the two months we have had to develop this project, sometimes we have had to do some assumptions in order to simplify the calculus and thus achieve a coherent software tool. |

4 | 1 | SERRA FONT, Anna | |

5 | 1 | SERRA FONT, Anna | At the beginning of the project we did a long list of all possible options and features that could be included in a link budget tool, selecting them by order of priority in order to implement them. |

6 | 1 | SERRA FONT, Anna | |

7 | 1 | SERRA FONT, Anna | Finally, in this last part is shown a list of other features and improvements that could be performed for future students. |

8 | 2 | RIBAS MACHADO, Ederson | |

9 | 3 | RIBAS MACHADO, Ederson | h3. SERVICE |

10 | 2 | RIBAS MACHADO, Ederson | |

11 | 9 | RIBAS MACHADO, Ederson | - Increase the possibilities of $BER$ and corresponding $\frac{Eb}{No}$ and Code gains. Our possible modulation applied is based in a table of the situation of Quasi-error-Free. As seeing in the figure below, from [1].Quasi-error-free (QEF) means that we will have less than one uncorrected error event per hour, for this table this situations correspond to a PER (Packet error ratio - relative to the symbols) about $10^{-7}$ . |

12 | 7 | RIBAS MACHADO, Ederson | |

13 | 7 | RIBAS MACHADO, Ederson | |

14 | 7 | RIBAS MACHADO, Ederson | p=. !{width: 45%}quasierrortable.png! |

15 | 1 | SERRA FONT, Anna | |

16 | 10 | RIBAS MACHADO, Ederson | <div style="margin-left: auto; margin-right: auto; width: 50em">Figure 1 - Table applied in SatLinkTool, Quasi-error-free situation, from reference [1]. |

17 | 10 | RIBAS MACHADO, Ederson | </div> |

18 | 1 | SERRA FONT, Anna | |

19 | 10 | RIBAS MACHADO, Ederson | |

20 | 9 | RIBAS MACHADO, Ederson | We would like to add others situations like the for a situation without FEC, when code rate = 1. We have already start this implementation. In the first steps we'we implemented, for QPSK,BPSK, 8PSK, 16PSK and 32PSK, the graphic of $BER$ x $\frac{Eb}{No}$. One idea, is take the value of $\frac{Eb}{No}$ from a user input of $BER$, and then, perform the calculations. This implementations in labview can be see below. |

21 | 9 | RIBAS MACHADO, Ederson | |

22 | 9 | RIBAS MACHADO, Ederson | p=. !{width: 80%}improvement.png! |

23 | 8 | RIBAS MACHADO, Ederson | |

24 | 11 | RIBAS MACHADO, Ederson | <div style="margin-left: auto; margin-right: auto; width: 50em"> Figure 2 - Possible reference application to further increase of $BER$ possibilities </div> |

25 | 1 | SERRA FONT, Anna | |

26 | 12 | RIBAS MACHADO, Ederson | To take the $\frac{Eb}{No}$ value from a $BER$ input, we can explore matlab functions like _solve(x,y)_. |

27 | 9 | RIBAS MACHADO, Ederson | |

28 | 2 | RIBAS MACHADO, Ederson | h3. PAYLOAD |

29 | 2 | RIBAS MACHADO, Ederson | |

30 | 12 | RIBAS MACHADO, Ederson | We have develloped the first step to calculate the total depointing angle. It consist in the angles of satellite-earth station geometry and true view angles $\alpha, \alpha, \beta, \beta \*, \theta \*, \varphi $ . One further improvements is finalize this implementation. |

31 | 3 | RIBAS MACHADO, Ederson | |

32 | 3 | RIBAS MACHADO, Ederson | h1. REFERENCES |

33 | 3 | RIBAS MACHADO, Ederson | |

34 | 3 | RIBAS MACHADO, Ederson | [1] |