: In recent years, filter bank multicarrier (FBMC) has recaptured widespread interests for its possible applications in cognitive radio and dynamic spectrum access. A distinctive feature for cognitive radio is its adaptivity to environment. When environment changes, a cognitive radio will change its parameters to optimize the transmission and receiving. Thus it is desirable to design a unified structure and algorithm for FBMC that needs little change for different parameters.In this paper, we propose a unified structure and parallel algorithms to implement the FBMC. The FBMC system and parallel algorithms are constructed based on the normalized prototype filter. The coefficients of the normalized prototype filter can be pre-computed and stored. The proposed parallel algorithms have the same structure for various choices of time duration, subcarrier spacing and bandwidth. Combined with known parallel algorithms for the fast Fourier transform (FFT), the proposed algorithms fully parallelize the computations for the transmitter and receiver, which can run much faster than conventional serial algorithms as modern processors usually have massive parallel capability. Keyword: FBMC,OQAM,FFT,WLAN,OFDM.
I.INTRODUCTION Orthogonal frequency division multiplexing (OFDM) has been probably the most successful multi-carrier modulation (MCM) scheme for the wired or wireless communication in the past two decades and it is employed in the standard of today's 4G network. Meanwhile, OFDM still plays an important role in many current applications such as asymmetric digital subscriber line (ADSL), digital video broadcasting (DVB) and wireless local area networks (WLANs). However, with the increasing number of users and devices, the need for energy efficiency and sophisticated spectrum utilization at low costs drawbacks of OFDM become apparent such as the cyclic prefix (CP) leading to a decrease in the system efficiency. Consequently, other MCM methods have been proposed and evaluated recently and latest research indicates a great potential for these methods which may have a big influence on next generation communication systems and may replace the conventional OFDM. One important, new emerging MCM method is the filter bank based multicarrier FBMC) transmission, which introduces filter banks to the OFDM system and discards the CP. In this sense, the FBMC is an evolution of OFDM. The employed filter bank will import extract flexibility to the system to cope with some drawbacks of OFDM. Intuitively, the filter bank can be designed with different properties to satisfy the communication requirements. For example, for the OFDM system, CP is used to eliminate inter symbol interference (ISI). In order to remove this interference completely, the length of CP must be no shorter than the length of the impulse response of the corresponding channel. However, this CP-redundancy decreases both spectral and power efficiency. For the FBMC, instead of CP, filter banks can be designed and applied to reduce the out-of-band power leakage and inc...