The impact of digital technologies on future land mobile spectrum requirements

Key advances in digital signal processing (DSP) enabling technologies are bringing about a paradigm shift in private land mobile radio (PLMR). Efficient digital modulation and information compression, made possible by advances in semiconductors, are providing the bandwidth reduction necessary to bring visual communication services like fax and video to the land mobile market place. The emergence of these advanced technologies will be fueled, largely, by the availability of adequate radio spectrum. The authors extend the work of K. Crisler and A. Davidson (IEEE 1990 Int. Symp. Electromagn. Compat. Symp. Record, pp. 401-405. 1990) and examine the impact of semiconductor advances on the context of PLMR.