In most digital communication systems, the information bits to be transmitted are protected against transmission errors. Typically, in the transmitter redundancy is added in a clever way by means of an encoder. In the receiver, a corresponding decoder is able to detect or to correct transmission errors by exploiting the redundancy. This technique is called channel coding. Applications of channe...

In this paper we present ChirpCast, a system for broadcasting network access keys to laptops ultrasonically. This work explores several modulation techniques for sending and receiving data using sound waves through commodity speakers and built-in laptop microphones. Requiring only that laptop users run a small application, the system successfully provides robust room-specific broadcasting at da...

We investigate the communication capacity and optimal data transmission schedules for processor networks connected by communication links, for example Transputer clusters. Each link allows the two processors at its endpoints to exchange data with a given xed transmission rate d. The communication itself is done in a blocking mode, that means the two processors have to synchronize before startin...