e authors noted that Chang's/Saltzberg's method could be adopted to match channel variations in doubly dispersive channels, and hence minimize intersymbol interference (ISI) and intercarrier interference (ICI). Saltzberg's method has received broad attention in the literature and has been given dif- ferent names. Most authors have used the name offset quadrature amplitude modulation (OQAM) to reflect the fact that the in-phase and quadrature components are transmitted with a time offset with respect to each other. Moreover, to emphasize the multicarrier fea- ture of the method, the suffix OFDM has been added, and hence the name OQAM-OFDM. Others have chosen to call it staggered quadrature amplitude modulation (SQAM), equiva- lently, SQAM-OFDM. In [6] the shorter name, staggered multitone (SMT), was introduced. Moreover, in [6] Chang's method is named cosine-modulated multitone (CMT) and it is shown that SMT and CMT are equivalent and, thus, with a minor modification, an imple- mentation for one can be applied to the other. Further details of SMT and CMT can be found in [7, 8]. We further note here that subcarrier bands in both SMT and CMT overlap to maximize the bandwidth efficiency. Another multicarrier method that has received some attention is filtered multitone (FMT) [9]. FMT is based on non-overlapping subcarriers, and hence is less band effi- cient, but separation of subcarriers may simplify some signal processing tasks in certain applications. The discussion in this chapter is limited to SMT and CMT. 5.3 Theory The theory of CMT and SMT has evolved over the past five decades through many researchers who have studied them from different angles. Early studies by Chang [3] and Saltzberg [4] have presented their finding in terms of continuous-time signals. The more recent studies have presented the formulations and conditions for ISI and ICI cancellation in discrete time, e.g. [10, 11]. On the other hand, a couple of recent works [6, 7], from the author of this chapter and his group, have revisited the more cl