Generation of band‐pass constant‐envelope signals with a pre‐assigned spectrum: a synthesis procedure

The recent, increasing adoption of spread‐spectrum techniques, either in communications or in other fields, makes the design of band‐pass sources a topical subject. We consider the generation of constant‐envelope (i.e. constant power) band‐pass signals via a frequency modulation technique. In particular, we propose a general solution to the synthesis problem of delivering a constant envelope signal with a pre‐assigned band‐pass spectrum. Both quasi‐stationary and non‐stationary modulations are discussed and a novel optimization algorithm is proposed for the latter case. A design example concludes the presentation.