Clarifying the theoretical limits of communication speed and data compression ratio.

Keywords: Information communication, information theory, communication systems, communication speed, data compression.

Around us, various information and communication devices have become widely used, allowing communication to take place in different locations and situations. Additionally, as exemplified by communication using web conferencing systems, there are increasing opportunities for communication involving multiple senders and receivers, rather than just a single sender and receiver. In response to these diverse forms of communication, I am researching theoretical limits regarding how fast communication speeds can be achieved and how small the compression ratio of data compression used during this process can be made. So far, I have clarified the theoretical limits of communication under assumed real-world conditions, such as when senders communicate asynchronously or when auxiliary cache memory, which can store part of the communication data in advance, is available on the receiver's side. By elucidating these theoretical limits, we can establish benchmarks for developing communication systems that facilitate such communication and gain insights into communication methods that can achieve these theoretical limits.

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