Document Type
Thesis
Date of Award
5-31-1989
Degree Name
Master of Science in Electrical Engineering - (M.S.)
Department
Electrical Engineering
First Advisor
Fidel Morales-Moreno
Second Advisor
Yeheskel Bar-Ness
Third Advisor
Joseph Frank
Abstract
Trellis encoding of correlative-FM is studied from the point of view of the overall structure, performance, bandwidth occupancy, and complexity. Here, correlative (partial-response) coding is used to improve the bandwidth efficiency of MSK (Minimum-Shift Keying) at the expense of performance. Then, trellis codes are used to improve the error-rate performance of the corresponding correlative-FM scheme with little or no increase in bandwidth occupancy (compared to uncoded MSK). In a sense, this is similar to Ungerboeck's coding for (memoryless) PSK modulation.
A new encoding approach, called matched encoding, is used here that produces trellis coded modulations achieving greater coding gains than with previously reported techniques. We use (average) transfer function methods to show the relation between Hamming distance of the (binary) trellis codes and the Euclidean distance of the trellis-coded modulations. Computer search techniques are used to find good trellis-coded modulations of complexity upto 256 states.
Finally a comparative study between the performance obtained with the codes found using the matched encoding method and the performance obtained using existing best codes is carried out.
Recommended Citation
Bhat, K. Narendra, "Unified study of trellis encoded correlative-FM" (1989). Theses. 2723.
https://digitalcommons.njit.edu/theses/2723
