Generalized Pre-Processor for Block and Convolutional Codes
TBMG-7011
09/01/2002
- Content
A generalized data processor, proposed for use in the reception of binaryphase-shift-keyed (BPSK) radio signals, provides preliminary estimates of the block and convolutionally encoded symbols that are meant to be con- veyed by the BPSK modulation. In a process denoted information-reduced maximum a posteriori (MAP) phase estimation, an estimate of the instantaneous symbol (and thus of the instantaneous phase modulation) is used to reduce the amount of randomness and information by converting the received modulated carrier to an approximation of an unmodulated carrier. The resulting partially recon- structed carrier is then fed as input to a MAP phase estimator to improve phasetracking performance. The basic principles of information-reduced MAP phase estimation were described in somewhat more detail in “Information-Reduced Carrier Synchronization for Coded PSK Operation at Low-SNR” (NPO-20261), NASA Tech Briefs, Vol. 22, No. 10 (October 1998), page 64.
- Citation
- "Generalized Pre-Processor for Block and Convolutional Codes," Mobility Engineering, September 1, 2002.