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Analysis of Fixed-Point Quantization Noise in Multicarrier Transmitter Schemes

In this paper we investigate the effect of quantization in MultiCarrier (MC) transmitters which use an IFFT block. Three MC modulations are considered: Orthogonal Frequency Division Multiplexing (OFDM), Filter Bank MultiCarrier (FBMC) with PolyPhase Network (PPN) implementation (FBMC-PPN), and FBMC with Frequency Spreading (FS) implementation (FBMC-FS). The Quantization Noise Power (QNP) in the case of fixed-point implementation at the output of the three transmitters are expressed analytically and verified through simulation. The results show that the OFDM transmitter has the lowest QNP, while the FBMC-FS transmitter has the highest QNP in the case of fixed-point arithmetic.