Title :
Simulation of Sequential Decoding with Phase-Locked Demodulation
Author :
Cahn, C.R. ; Huth, Gaylord K. ; Moore, C.R.
Author_Institution :
Magnavox Research Laboratory, Torrance, CA, USA
fDate :
2/1/1973 12:00:00 AM
Abstract :
Convolutional encoding with biphase modulation is an attractive combination of modulation/coding for the Gaussian channel, but a means of tracking carrier phase must be provided. The performance of combined sequential decoding and suppressed carrier (Costas loop) tracking in the receiver is difficult to analyze but can be obtained by computer simulations. Results of such simulations are presented in the form of a Pareto fit to the computation distributions for various tracking loop bandwidths and demodulator quantization (soft decisions). These distributions are applied to predict probability of error performance for typical decoder parameters (buffer size, speed factor). The anticipated advantage of quantized demodulation is observed. However, narrow tracking bandwidths are required, with sufficient interleaving to overcome effects of correlated phase perturbations due to noise.
Keywords :
Convolutional codes; Digital phase locked loops; PLLs; PSK demodulation; Phase-locked loop (PLL); Sequential decoding; Bandwidth; Computer simulation; Convolutional codes; Decoding; Demodulation; Gaussian channels; Modulation coding; Performance analysis; Phase modulation; Tracking loops;
Journal_Title :
Communications, IEEE Transactions on
DOI :
10.1109/TCOM.1973.1091623