Wireless LAN White Papers
High Performance Viterbi Decoder for OFDM Systems
Overview It is well-known that, for systems that deploy conventional convolutional codes, a Viterbi decoder is the best solution in maximum likelihood sense to decode an information sequence. Typically, a Viterbi decoder uses Euclidean or Hamming distance as a metric. The use of a conventional metric leads to a high performance for systems that are employed for frequency nonselective channels (e.g., Additive White Gaussian Noise (AWGN), or Rayleigh fading). However, if the system is based on Orthogonal Frequency Division Multiplexing (OFDM) and the channel has frequency selective multipath fading, then the performance can be further improved. This paper proposes a simple modification to the conventional Viterbi metric (Euclidean distance) that improves the performance substantially if the channel is frequency selective.
| Publisher | University of California | File Format | |
|---|---|---|---|
| Date Published | April 2006 | ||
| Format | White Papers | ||
| Topics | |||
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