EAN: 9783031003851

SYNTHESIS LECTURES ON ALGORITHMS AND SOFTWARE I...

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

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