Binary CPMs With Improved Spectral Efficiency

Abstract

We design new continuous phase modulation (CPM) formats which are based on the combination of a proper precoder with binary input and a ternary CPM. The proposed precoder constrains the signal phase evolution in order to increase the minimum Euclidean distance, and to limit the bandwidth expansion due to the use of a ternary CPM. The resulting schemes are highly spectrally efficient and outperform classical binary and quaternary formats in terms of coded and uncoded performance.

New binary single side band CPM

“…For instance, CPM has been introduced in the DVB-RCS2 standard [4]. The aim for the use of CPM in these contexts of communication is twofold: first, to exploit their inner immunity against nonlinear distorsions, resulting from the constant envelope; second, to take advantage of their recursive nature allowing their particular use in serially concatenated schemes [5]. Consequently, CPM is classified as power efficient digital modulation, and is therefore often prefered to linear modulations.…”