High data rate X-band transmitter for low Earth orbit satellites

Date

2007-04-26

Author

Sunay, Hacer K.
Ismailoglu, Neslin
Kirilmaz, Tunahan
Dudak, Celal
Sen, Ozlem A.

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

221
views

0
downloads

Main purpose of this study is to design a transmitter with data rates up to 100 Mbps, having QPSK/OQPSK modulation and 7 W (38.5 dBm) output power at 8.2 GHz. This output power satisfies the link budget for a low earth orbit (LEO) satellite at 700 km, utilizing required source-channel coding schemes in baseband for a BER performance of 10(-6). The modulation scheme of the transmitter can be selected as BPSK, QPSK or OQPSK. In addition to QPSK/OQPSK modulation scheme choice, the transmitter will have three different data rates, 50 Mbps and 100 Mbps which will be chosen according to the needs and facilities of the ground station. As error correction coding (ECC) scheme, a nested structure that is recommended by CCSDS is chosen which combines powerful parts of the subcodes. As the outer code, Reed Solomon with (255,223,33)(256) is used for error correction for burst errors due to multipath fading. As inner code, a convolutional code with rate (1/2) is utilized, which provides correction for random errors in the channel with a moderate bandwidth expansion. Between inner and outer codes, convolutional interleaver with depth 5 is used.

Subject Keywords

Efficiency

URI

https://hdl.handle.net/11511/68113

DOI

https://doi.org/10.1007/978-1-4020-6943-7_36

Collections

Unclassified, Conference / Seminar

Suggestions

OpenMETU
Core

A new approach to unified performance analysis of randomly-spread CDMA systems over multipath fading channels via crosscorrelation matrix non-asymptotic average eigenvalue distributions Ertug, O; Baykal, Buyurman; Sayrac, B (2003-09-10) A new unified method for closed-form theoretical performance analysis of randomly-spread CDMA systems over multipath fading channels with multiuser receivers is presented. The basis of the analysis is the representation of the random signal-to-interference ratios (SIR) at finite system parameters in terms of the eigenvalues of the crosscorrelation matrices for which the non-asymptotic average distributions are found or known. The methodology presented complements the asymptotic limiting theory used in simil...
ARMATURE SHAPE OPTIMIZATION OF AN ELECTROMAGNETIC LAUNCHER USING GENETIC ALGORITHM Ceylan, D.; Gudelek, M. U.; Keysan, Ozan (2017-06-22) Barrel side and pulsed power supply module are two crucial parts of an electromagnetic launcher (EML), which affects the efficiency. One of the most important features in the barrel side is the shape of the armature. In this study, the shape of the armature is optimized by using independent variables to define the exact geometry of the armature. The main goal is to maximize the muzzle kinetic energy of the projectile. Armature geometry is divided into pieces which are used in the optimization algorithm as i...
Efficient integrated DC-DC converters for ultra-low voltage energy harvesters Jayaweera, Herath; Muhtaroğlu, Ali; Sustainable Environment and Energy Systems (2017-8) The self-starting on-chip fully integrated ultra-low voltage DC-DC converters for energy harvesting applications presented in literature generally have low efficiency and output power capacity. Any improvement in DC-DC converter circuits in terms of energy efficiency, output power, self-starting modes, and voltage gain will contribute significantly to the widespread application of energy harvesters. Two novel fully integrated, self-starting, ultra-low voltage DC-DC converter topologies and model based optim...
Improving the efficiency of microwave power amplifiers without linearity degradation using load and bias tuning in a new configuration Ronaghzadeh, Amin; Demir, Şimşek; Department of Electrical and Electronics Engineering (2013) Advanced digital modulation schemes used in the wireless applications, result in the modulated RF signals with high peak to average power ratio which requires linear amplification. On the other hand, the demand for a longer talk time with less battery volume and weight, especially in hand-held radio units, necessitate more power efficient methods to be utilized in power amplifier design. But improved linearity and efficiency have always been contradicting requirements demanding innovative power ampliﬁer and...
Three-Phase Inverter Topologies for Grid-Connected Photovoltaic Systems Özkan, Ziya; Hava, Ahmet Masum (2014-05-21) In this paper, the energy conversion efficiency (ECE) and cost characteristics of three-phase photovoltaic (PV) inverters (3P-PVIs) are studied comprehensively based on the operating principles of topologies and with respect to various performance indicators such as semiconductor device count and utilization factors, semiconductor efficiency (SE), dc-bus capacitor and filter inductor voltage/current ripple factors. The evaluation of topologies are based on datasheet parameters and analytical results are pro...

Citation Formats

H. K. Sunay, N. Ismailoglu, T. Kirilmaz, C. Dudak, and O. A. Sen, “High data rate X-band transmitter for low Earth orbit satellites,” 2007, p. 387, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/68113.