TITLE:
OFDM System Implementation in DSP Platform TMS320C6678
AUTHORS:
Rafael Masashi Fukuda, Taufik Abrão
KEYWORDS:
OFDM, DSP Platform, Implementation, Bit Error Rate, Signal Processing, Telecommunication Systems
JOURNAL NAME:
Journal of Computer and Communications,
Vol.4 No.11,
September
28,
2016
ABSTRACT: The Orthogonal Frequency Division
Multiplexing (OFDM) system is already used in commercial applications and is
capable to deal with Intersymbolic Interference (ISI) caused by multipath
channels. This system gained popularity after the application of the Fast
Fourier Transform (FFT) and its inverse (IFFT) to modulate the signal in many
subcarriers. This paper discusses implementation aspects of an OFDM system;
such system is characterized by considering real constraints, including the
memory consumption and the processing time. The OFDM modulator, channel samples
and OFDM demodulator were implemented entirely in the DSP TMS320C6678 platform.
As a proof-of-concept, a 256-QAM OFDM BER performance is compared with theoretical
values. Moreover, the memory size is not demanding, consuming very few resources.
It was observed a very high number of DSP clock cycles needed for the OFDM
signal modulation, corresponding to more than 4 times the number used in demodulating
the signal.