This invention (Simplex Amplitude Modulation, or SAM) is a fundamental improvement in digital communications waveform design, with potential application in any communications link that uses digital modulation. The key attribute is that the waveform achieves increased power efficiency at a given level of error performance without sacrificing bandwidth efficiency. Hence it will be most beneficial in power-constrained environments such as cellular phones, satellites, or any battery powered device (such as wireless devices using Internet of Things technology).
The invention is an improvement on a widely used digital modulation called QAM (Quadrature Amplitude Modulation). Generally speaking, QAM may be replaced by SAM in any system for an improved power efficiency with little increase in receiver complexity. Examples of digital communications standards which use QAM as an underlying modulation include cellular (LTE, CDMA), satellite (DVB-S), television (DVB-C, DOCSIS) and wireless networking (WiFi, WiMAX). Additionally, there are many proprietary and military systems using QAM. All could benefit from the use of SAM.