Elements of information theory
Elements of information theory
Predicting text entry speed on mobile phones
Proceedings of the SIGCHI conference on Human Factors in Computing Systems
A Corpus for the Evaluation of Lossless Compression Algorithms
DCC '97 Proceedings of the Conference on Data Compression
Techniques for Fast and Easy Mobile Text-Entry with Three-Keys
HICSS '04 Proceedings of the Proceedings of the 37th Annual Hawaii International Conference on System Sciences (HICSS'04) - Track 9 - Volume 9
Model for non-expert text entry speed on 12-button phone keypads
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Energy aware lossless data compression
Proceedings of the 1st international conference on Mobile systems, applications and services
Adaptive middleware architecture for information sharing on mobile phones
Proceedings of the 2007 ACM symposium on Applied computing
A middleware for information processing in mobile computing platforms
International Journal of Mobile Communications
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This paper presents a new source coding model for the efficient transmission of mobile text messages. Unlike conventional text messages, which are sent in the form of character sequences, the proposed method uses key-code sequences that reflect the user's typing history for authoring the message. The key-code representation can be as efficient as 4 bits per key-code by utilizing existing dictionary-based text entry systems and mobile phones equipped with the standard reduced keyboard. Experiments that use an optimal dictionary show that the key-code representation can save 2.95 bits per character compared to the conventional ASCII representation. Further, computation of the entropy shows that the optimal code-word length of the ASCII representation in kth-order approximation, where probability distributions of blocks of k symbols are given, cannot be comparable to that of the key-code in (k-l)-order approximation.