Reduction in bandwidth by using variable length codes
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A method of coding an ensemble of messages of a finite number of symbols is developed. Minimizing the average number of coding digits per message by using Huffman coding can result in a large variance. This is a problem because a large variance requires a large buffer and also creates more time delay during transmission and decoding respectively for on-line communication. This research examines modified Huffman codes for the purpose of finding a way to reduce the variance. The effective parameters which give the lower variance modified Huffman codes are obtained. The buffer requirements and the reduction of the bandwidth to forward messages in an on-line communication is investigated. A possible design for a practical system is presented for using the modified Huffman codes.
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Kilic, Suha (Monterey, California. Naval Postgraduate School, 1985-03);Huffman Coding minimizes the average number of coding digits per message. Minimizing the mean time by this method raises the problem of large variance. When the variance is large there is a greater probability that an ...
Reduction in bandwidth and buffer size by using modified Huffman coding after dropping the less frequent source symbols Corapcioglu, Ahmet (1987-03);This research employs the modified Huffman coding technique after dropping the selected source symbols, with respect to the usage frequencies. The expected results are a decrease in average length as well as in variance. ...
Pyloudis, Konstantinos (Monterey California. Naval Postgraduate School, 2006-09);Trellis-coded modulation (TCM) is a known technique to increase the data rate without increasing the channel bandwidth when implementing error correction coding. TCM is a combination of M-ary modulation and error correction ...