PERFORMANCE OF MIMO-FBMC SYSTEM WITH ADAPTIVE FILTER

Filter bank multicarrier (FBMC) has been considered as an effective multicarrier communication technique, mainly for communication under doubly dispersive channels as it fulfils the needs of the next generation standards. The prototype filters used in FBMC systems must satisfy localization criteria and dual orthogonality to battle the unfavorable channel effects like intersymbol interference (ISI) and inter carrier interference (ICI). Even if the doubly localized filters which are used conventionally are best possible in the absence of the channel, they fail to satisfy the orthogonally and localization criteria under doubly dispersive channels. In order to maximize the SNR, the prototype pulse shape must match with the time and frequency domain channel dispersions. Also, multiple antenna techniques combined with FBMC can give better performance. An adaptive system using MIMO filter bank is proposed in which time and frequency domain spreading of the pulse is made to match with that of the channel conditions by adaptively varying the subcarrier bandwidth with respect to the maximum delay spread and Doppler spread of the channel. The signal to noise ratio (SNR) and bit error rate (BER) comparisons illustrate the supremacy in the performance of the adaptive system.