DSP-based implementation of a half-duplex orthogonal frequency division multiplexing system

Orthogonal Frequency Division Multiplexing (OFDM) technology, mainly due to its high data rates and effectiveness in combating frequency selective fading channels has been extensively used in wireless (and wired) communication systems. Digital Audio and Video broadcasting, ADSL and VDSL broadband access, and Wireless LAN systems using the IEEE 802.11a, g, n, and HIPERLAN/2 standards are only a few of the major applications of OFDM. This paper presents an implementation of a half-duplex OFDM system using Digital Signal Processing (DSP) LAB 2000 kits by Texas Instruments. One DSP kit acting as an OFDM transmitter, TX sends a signal from the computer system to another DSP kit acting as an OFDM receiver, RX over a wired channel. The results are discussed as MATLAB plots for input and output signals from the TX to RX, respectively. Due to limited clock speed of the DSP processor at 50MHz, a transmit data rate of 1.2Mbps was achieved.