Accession Number : ADA257635


Title :   Coded Orthogonal Signaling


Descriptive Note : Master's thesis


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA


Personal Author(s) : Semerciler, Salih


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a257635.pdf


Report Date : Sep 1992


Pagination or Media Count : 47


Abstract : In this thesis, a new scheme of encoding orthogonal MFSK signals with convolutional codes is proposed. Instead of separating the code and the signals as is done conventionally, here the m outputs of the convolutional encoder of rate k/m are used to select the M = 2m orthogonal FSK signals. This combined coded system is called trellis-coded modulation MFSK (TCM/MFSK). The free distance of TCM/MFSK codes is found computationally. Asymptotic coding gains (ACG) of several TCM/MFSK systems relative to uncoded MFSK systems having the same bandwidth efficiency (bits/s/Hz) are calculated. Both analytic descriptions and natural mapping implementations of TCM/4-FSK with rate 1/2 and TCM/8-FSK with rate 2/3 for several constraint lengths of the convolutional codes are given. The analytic description of TCM/MFSK is also obtained computationally. Coding, TCM, MFSK.


Descriptors :   *SIGNAL PROCESSING , *CODING , *FREQUENCY SHIFT KEYERS , *ORTHOGONALITY , OUTPUT , RATES , MAPPING , MODULATION , CODERS , NOISE(ELECTRICAL AND ELECTROMAGNETIC) , DIGITAL COMMUNICATIONS , BANDWIDTH , SIGNALS , EFFICIENCY , THESES


Subject Categories : Computer Programming and Software
      Radio Communications


Distribution Statement : APPROVED FOR PUBLIC RELEASE