Document Type
Thesis
Date of Award
9-30-1986
Degree Name
Master of Science in Electrical Engineering - (M.S.)
Department
Electrical Engineering
First Advisor
Joseph Frank
Second Advisor
Stanley S. Reisman
Abstract
Multi-h CPM, a generalization of CPFSK and also one of the so-called Combined Modulation and Coding schemes, is useful in digital communication systems where both the bandwidth and power are constrained. The increased signal processing complexity, which can be viewed as the third communication resource, is used to trade for both power and bandwidth, and to approach the error-free communication promised by Shannon's theorem.
The transmitted multi-h CPM signal carries a coded sequence of continuous phase changes; the possible phase states form a cylindrical trellis in phase and time, in which the modulation indices are reused in a cyclical fashion. The trellis diagram, minimum Euclidean distance between symbols, error rate and bounds, and power spectral density are investigated. Comparisons with other basic digital communication techniques are also examined. Simple codes using 4-16 phases, together with a Viterbi Algorithm decoder, allow a 2-4 dB power savings over BPSK with a narrower bandwidth. Four-ary 2-h schemes are found to have the best trade-off between complexity and coding gain. The free distance and decision depth are also determined. Finally, Viterbi Algorithm applied in the detection of a received AWGN-corrupted multi-h CPM signal is studied.
Recommended Citation
Chen, Jyung-cheng, "Multi-h continuous phase modulation : its properties and analysis" (1986). Theses. 3187.
https://digitalcommons.njit.edu/theses/3187
