The short message service (SMS) is a wireless medium of transmission that allows you to send brief text messages. Cell phone devices have an uttermost SMS capacity of 1,120 bits in the traditional system. Moreover, the conventional SMS employs seven bits for each character, allowing the highest 160 characters for an SMS text message to be transmitted. This research demonstrated that an SMS message could contain more than 200 characters by representing around five bits each, introducing a data structure, namely, adjacent distance array (ADA) using the Huffman principle. Allowing the concept of lossless data compression technique, the proposed method of the research generates character's codeword utilising the standard Huffman. However, the ADA encodes the message by putting the ASCII value distances of all characters, and decoding performs by avoiding the whole Huffman tree traverse, which is the pivotal contribution of the research to develop an effective SMS compression technique for personal digital assistants (PDAs). The encoding and decoding processes have been discussed and contrasted with the conventional SMS text message system, where our proposed ADA technique performs outstandingly better from every aspect discovered after evaluating all outcomes.

翻译：短消息服务（SMS）是一种允许发送简短文本信息的无线传输媒介。传统系统中手机设备的最大SMS容量为1,120比特。此外，传统SMS采用每字符7比特编码，使得每条SMS文本信息最多可传输160个字符。本研究证明，通过引入一种名为相邻距离数组（ADA）的数据结构并运用哈夫曼原理，可将每字符压缩至约5比特，从而使单条SMS信息包含超过200个字符。基于无损数据压缩技术理念，本研究所提出的方法利用标准哈夫曼编码生成字符码字。然而，ADA通过存储所有字符的ASCII值距离对信息进行编码，并通过避免遍历整个哈夫曼树完成解码——这是本研究为个人数字助理（PDA）开发高效SMS压缩技术的核心贡献。本文对编码与解码过程进行了详细阐述，并与传统SMS文本信息系统进行了对比，结果表明在评估所有指标后，我们提出的ADA技术在所有方面均表现显著更优。