FPGA Implementation of a WHT-OFDM Modem

OFDM is one of the most widely used multi-carrier modulation technologies in wireless communication. However, case high mobility, orthogonality between sub-carriers destroyed due to existence time selective fading, and performance system greatly affected. In order reduce this effect, data can be pre-coding before modulation. The technique adopted paper Walsh-Hadamard transform (WHT). are distributed evenly on all by WHT operation, which avoids problem loss caused some can’t recovered. paper, design scheme WHT-OFDM first proposed, then demodulation module designed using Verilog HDL language, simulation verification completed. results proved that successfully implemented FPGA.