Orthogonal Frequency Division Multiplexing (OFDM) systems are
widely used in the standards for digital audio/video broadcasting,
WiFi and WiMax. Being a frequency-domain approach to
communications, OFDM has important advantages in dealing with the
frequency-selective nature of high data rate wireless communication
channels. As the needs for operating with higher data rates become
more pressing, OFDM systems have emerged as an effective
physical-layer solution. This short monograph is intended as a
tutorial which highlights the deleterious aspects of the wireless
channel and presents why OFDM is a good choice as a modulation that
can transmit at high data rates. The system-level approach we shall
pursue will also point out the disadvantages of OFDM systems
especially in the context of peak to average ratio, and carrier
frequency synchronization. Finally, simulation of OFDM systems will
be given due prominence. Simple MATLAB programs are provided for
bit error rate simulation using a discrete-time OFDM
representation. Software is also provided to simulate the effects
of inter-block-interference, inter-carrier-interference and signal
clipping on the error rate performance. Different components of the
OFDM system are described, and detailed implementation notes are
provided for the programs. The program can be downloaded here.
Table of Contents: Introduction / Modeling Wireless Channels /
Baseband OFDM System / Carrier Frequency Offset / Peak to Average
Power Ratio / Simulation of the Performance of OFDM Systems /
Conclusions
General
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