Title :
Kurtosis DPLL AND PTCM decoder for non-linearly amplified 16-QAM
Author :
Jayasimha, S. ; Jyothendar, P.
Author_Institution :
Signion Syst. Ltd., Hyderabad
Abstract :
We describe a non-decision directed kurtosis-based digital phase lock loop (DPLL) algorithm for 16-QAM carrier recovery in the presence of non-linear amplification. A constellation rotation (with respect to locked phase) allows each of the trellis decoder´s set-partitions to be fully confined to the received vector quadrants. Transponder characteristic variations may be automatically tracked by adapting the TCM decoder´s metric LUT based on 4 dominant maxima in a 2-D histogram of quadrant data
Keywords :
amplification; decoding; digital phase locked loops; quadrature amplitude modulation; trellis coded modulation; LUT; PTCM decoder; TCM decoder; carrier recovery; constellation rotation; digital phase lock loop; kurtosis DPLL; nonlinear amplification; nonlinearly amplified 16-QAM; trellis decoder; vector quadrants; Carrier confinement; Constellation diagram; Convolutional codes; Histograms; Maximum likelihood decoding; Maximum likelihood estimation; Modulation coding; Satellites; Table lookup; Transponders;
Conference_Titel :
Military Communications Conference, 2005. MILCOM 2005. IEEE
Conference_Location :
Atlantic City, NJ
Print_ISBN :
0-7803-9393-7
DOI :
10.1109/MILCOM.2005.1605668
