128-qam Definition

A variation on the quadrature amplitude modulation (QAM) signal modulation scheme. 128-QAM yields 128 possible signal combinations, with each symbol representing seven bits (2 7 = 128). The yield of this complex modulation scheme is that the transmission rate is seven times the signaling rate. See also amplitude, bit, modulation, QAM, signal, signaling rate, symbol, and transmission rate.