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Abstract
OFDM is a multi-carrier system where data bits are encoded
to multiple sub-carriers, while being sent simultaneously.
This results in the optimal usage of bandwidth. A set
of orthogonal sub-carriers together forms an OFDM symbol.
To avoid ISI due to multi-path, successive OFDM symbols
are separated by guard band. This makes the OFDM system
resistant to multi-path effects.
Although OFDM in theory has been in existence for a
long time, recent developments in DSP and VLSI technologies
have made it a feasible option. Many wired and wireless
standards like DVBT, DAB, xDSL and 802.11a have adopted
OFDM.
This paper first lists various approaches to implement
an OFDM system. It then describes the VLSI implementation
of OFDM in setails. Specifically the 802.11a OFDM system
has been considered in this paper. However, the same considerations
would be helpful in implementing any OFDM system in VLSI.
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Authors
Aseem Pandey,
Shyam Ratan Agrawalla,
Shrikant Manivannan
To know more about Wipro in VLSI, go to www.wipro.com/vlsi
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