Performance comparison between OFDM and FBMC systems in Digital TV transmission

A filter bank multicarrier (FBMC) system having a high level of compatibility with OFDM systems is proposed as new technique for Digital TV transmission. In order to reach the level of robustness, selectivity and performance required by the Digital TV transmission channel, the approach is based on near-perfect reconstruction (NPR) filter bank system combined with OQAM modulation. A key feature of the approach is the fractionally-spaced (FS) sub-channel equalizer, which is able to compensate the channel distortions and cope with residual timing offsets. An efficient and accurate technique is described for the derivation of the sub-channel equalizer coefficients from the OFDM frequency domain equalizer coefficients. As FBMC system discarding the use of the guard time interval, commonly used in OFDM systems, the data bit rate can be increased maintaining the same bandwidth.