Modulation is fundamental to electronic communications. The modulating signal might be analog in nature (voice or music) or digital bit streams. Most modern communication systems are digital, using ...

Quadrature amplitude modulation signalling is currently enabling rapid data transfer capacity growth, but it still has associated drawbacks. Here, Liu et al.use optical injection locking to ...

Whether you know it or not, the most popular modulation scheme in use in the wireless world today is QAM or quadrature amplitude modulation. It is a combination of both amplitude and phase modulation.

Wired transmission to the home is mostly by coaxial cable, using quadrature amplitude modulation (QAM), or by twisted pair, using OFDM over DSL. Physical media, i.e., DVD or Blu-ray, use an optical ...

To meet user demands for ever-higher data rates, the system must have wide bandwidth and be able to process both high- and low-amplitude signals ...