Implementation of multicarrier modulation using FPGA

OData support
Dr. Kollár Zsolt
Department of Broadband Infocommunications and Electromagnetic Theory

The OFDM (Orthogonal Frequency Division Multiplexing) is one of the most common

multicarrier modulation schemes nowadays. The DVB-T standard is based on this mo-

dulation as well. While modulating, the signal will be constructed in the baseband, then

it will be transmitted after a converting it to the passband.

With the spreading of the cognitive radios, the FBMC (Filterbank Multicarrier) mo-

dulation scheme will come into view. A great advantage of the lterbank is, that the signal

has a more ecient spectrum than the OFDM signal. It has a low ACLR (Adjacent Chan-

nel Leakage Ratio), so it doesn’t disturb the adjacent channels. There are two ways to

implement FBMC modulation: one with an extended IFFT, the other, computationally

more ecient way: with a polyphase decomposition of the lterbank. With the use of

FPGA (Field Programmable Gate Array) one can design a fully parallel structure. With

this method, a real time polyphase lterbank implementation for FBMC modulation can

be realised.


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