esa - A High Data Rate X-Band Transmitter X-Band with an...

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A A High Data Rate High Data Rate X-Band Transmitter X-Band Transmitter with an Efficient Solid State with an Efficient Solid State Power Amplifier Power Amplifier by Dr. Ozlem A. Şen, Celal Dudak, Hacer K. Sunay, A.Neslin İsmailoğlu, Tunahan Kırılmaz TUBITAK-BILTEN Middle East Technical University,ANKARA,TURKIYE
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Contents Contents INTRODUCTION: Transmitter Overview INTRODUCTION: Transmitter Overview Design Design and Realisation and Realisation of Transmitter of Transmitter Baseband Baseband IF stage IF stage RF Stage RF Stage Power Amplifier Power Amplifier Design Design Simulation Simulation Realization and measurements Realization and measurements Conclusion and Future Work Conclusion and Future Work
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Introduction: Transmitter overview Introduction: Transmitter overview Low Earth Orbit (LEO) Satellite Tranmitter Data rates up to 100 Mb/s with BPSK/QPSK/OQPSK modulation Linearity requirements 7W (38.5 dBm) output at 8.2 GHz Efficiency-linearity trade off
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Block Diagram of Transmitter Block Diagram of Transmitter X-BAND OUTPUT 7 WATT ENCODER 25/50/100Mbps BASEBAND DATA PROCESSOR I Q IF STAGE IF =2210 MHz RF STAGE RF=8200 MHz D/A CONVERTER I Q D/A CONVERTER LO Direct Quadrature MODULATOR
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General Properties of General Properties of Transmitter Transmitter 680 km altitude orbit Supporting maximum 100Mbs data rate at min. 30° elevation angle 10 -6 BER 4.5 m dish antenna at the ground station Patch antenna structure at 8.2 GHz with maximum gain at 30° elevation angle 7 W output power
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Baseband Baseband Baseband data processing including channel coding Implementation on FPGA, Xilinx Virtex-II Conversion of digital I & Q data into analog through high speed DACs Direct conversion into IF through direct quadrature modulators
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Baseband-Coding Baseband-Coding Channel Coding: nested structure Outer code: Reed Solomon with (255,223,33) 256 , for burst errors due to multipath fading Inner code: a convolutional code with rate (1/2) For random errors with a moderate bandwidth expansion
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Modulation Supporting 25/50/100 Mbs for BPSK/QPSK/OQPSK modulation schemes High data rate considering BW constraints imposed by satellite communication
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esa - A High Data Rate X-Band Transmitter X-Band with an...

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