Design of high performance filter bank multi-carrier transmitter

Abstract

Filter bank multi-carrier (FBMC) is very important to achieve high spectral efficiency in the wireless communication process. Previously, orthogonal frequency division multiplexing (OFDM) technique is used to obtain a high spectral efficiency. But area, power and delay is high than the FBMC transmitter technique. The main aim of this work is to design an optimized FBMC transmitter for high speed, low power and low area applications. There is a tradeoff between power and speed. To overcome this challenge, a new compact FBMC transmitter will be introduced in the paper. Generally, the FBMC transmitter consists of serial to parallel converter, QAM modulation, inverse FFT, parallel to serial converter and filter. The existing FBMC transmitter is designed by using inverse radix 2 FFT and poly phase filter. It requires more area, power and delay. To overcome this problem, a new radix2 multipath delay commutator (R2MDC) based inverse FFT and multiple constant multiplication (MCM) based FIR filter are used in the proposed FBMC transmitter. Because MCM based FIR filter doesn’t needs multiplier structure. The multiplication process is done by shift, add and subtract operation. Hence area and power is low in MCM based FIR filters, when compared to poly base filter. Also R2MDC FFT is used for high speed application. Comparison between conventional FBMC transmitter and proposed FBMC transmitter is carried out to analyze the performance, area, complexity and power. Also the functionality of FBMC transmitter is verified by using Xilinx ISE Virtex5 device. From the comparison results, it shows that the proposed FBMC transmitter offers 17% average area, delay and power (ADP) product than the existing FBMC transmitter.