Fixed-Point Design of 1024-Point CI-OFDM for DVB-Satellite to Handheld

摘要

The Digital Video Broadcasting Satellite to handheld (DVB-SH-A) employs Orthogonal Frequency Division Multiplexing (OFDM) that suffers from high Peak to Average Power Ratio (PAPR). Carrier Interferometry (CI) spreading codes is an efficient method that reduces PAPR with less computational complexity and without degrading BER performance. Therefore, CI-OFDM is proposed in place of OFDM for the existing DVB-SH-A. The fixed-point design of 1024-point CI-OFDM baseband transceiver using QPSK scheme is designed using Xilinx System Generator (XSG) and Verilog HDL with signed representation. Oversampling method is employed to approximate the baseband PAPR. Also, the behavior of CI-OFDM is validated on fixed-point AWGN channel. The fixed-point performance parameters like BER and PAPR are compared with MATLAB simulations.