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Performance analysis of fast convolution based FBMC-OQAM system

Filter Bank based Multicarrier (FBMC) system is a multicarrier scheme that has recently gained attention due to its better spectral properties compared to OFDM systems. FBMC system is one among the strong contenders for 5G implementations. While better designs of FBMC systems are evolving with time, it is imperative that the hardware complexity is not overlooked. It is important that filter bank designs with reduced computational resources are sought. Reducing computational complexity offers advantages like less power consumption, faster computations and reduced runtime resources. These advantages have more significance in 5G where ultra high speed and ultra low latency are the highlights. Filter bank designs using fast convolution employ less arithmetic resources compared to polyphase filter bank implementations. The fast convolution filter design makes use of only filter's frequency domain sample values for filtering since the filtering is restricted to frequency domain. So the conventional polyphase implementation of filter is completely done away with. In this paper, we present FBMC/OQAM system using Fast Convolution and the performance of the system is evaluated in a communication channel. The system is compared with conventional polyphase FBMC/OQAM system and it is found that fast convolution based system outperforms polyphase implementation of FBMC system in computational complexity and BER performance.