able, a multi-tap equalizer can be instrumental. In particular, the difference between the clock used at the transmitter to pass the signal samples to a digital-to-analog converter (DAC) and the one used at the receiver to control the rate of samples taken by an analog-to-digital converter (ADC) at the receiver introduces a constant drift in the timing phase of the sampled signal. This drift, as explained in Section 5.5, can deteriorate the receiver performance. The use of a multi-tap equalizer can resolve this problem to a great extent. Numerical results that demonstrate this can be found in [8]. 5 Filter Bank Multicarrier Modulation Computational Complexity Polyphase structures are commonly used to implement FBMC transmitter and receiver [19]. Direct mimicking of the continuous-time structures of Figures 5.3 and 5.6 to implement CMT and SMT, respectively, may lead to structures whose complexity are not optimized. It leads to one polyphase structure per set of real symbols. However, taking advantage of some multirate techniques, there exist clever methods that combine the polyphase struc- tures for each pair of real symbols, equivalent to an OQAM symbol, to cut the complexity to about one half at the transmitter side of FBMC systems. At the receiver side, special attention has to be paid SO that proper equalizers can be applied to the analyzed signal com- ponents. A detailed study along this line has been presented in [8]. The conclusion made in this study is that SMT and CMT have a complexity that is roughly two to three times that of OFDM. 5.8 Applications In [7], OFDM and FBMC are contrasted with respect to their suitability for different applica- tions. It is noted that while for many applications OFDM is a perfect choice, FBMC may be a superior choice for other applications. The applications in which FBMC may be preferred are (i) the uplink of multiuser multicarrier systems; (ii) cognitive radios; (iii) doubly disper- sive channels; and (iv) digital subscriber lines and power line communications. Detailed d