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Dileep K G,Pradeep Goutam,Laxmaiah P,Nithin Kumar S,Hari Prasad S V,Nithin B 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.1
This paper demonstrates the implementation of a QPSK/Time Division Multiple Access (TDMA) satellite receiver using short preamble-based synchronization in the presence of timing, frequency and phase offsets, and with Additive White Gaussian Noise (AWGN). The detection and estimation of synchronization parameters of the received signal, i.e., frequency, phase and symbol timing, are highly dependent on the preamble of the burst. Moreover, computational complexity and acquisition time of the receiver are directly proportional to the preamble length. The implemented receiver uses a 64-bit short preamble for synchronization and gives better bit error rate (BER) performance at low signal to noise ratio (SNR), close to -3dB. The functional verification of the synchronization algorithm is done using Matlab simulations and the algorithm implementation uses fixed-point C. The receiver design has been prototyped for 4 TDMA channels in Texas Instruments (TI) multi-core C66x DSP. The design and implementation of this receiver have been done for C-DOT indigenous satellite project.