Abstract—This paper introduces a novel approach to data com-
Christoph K. LaDue, Vitaliy V. Sapozhnykov, Kurt S. Fienberg · 2008
4(GSM) voice channel. It is based on the concept of “symbols”—a 5 set of predefined signals with finite bandwidths. Data are encoded 6 into the symbols, and the symbols are voice coded as they were 7 speech, modulated into the GSM signal, sent over the air, GSM 8 demodulated, voice decoded, and converted back to data. The 9 symbols are synthesized by a genetic algorithm with the aim of 10 maintaining separability after passing them through the voice 11 codec. This method enables data transfer over communication net12 works that do not have dedicated data channels and could also be 13 used in conjunction with other data services to balance the system 14 load between data and voice channels, allowing optimization of 15 system resources. We present the full algorithmic structure of the 16 system, which performs data communications over the GSM voice 17 channel, and we also give the results of the performance tests. 18 Index Terms—Data communications, genetic algorithms (GAs), 19 mobile communications, vocoders. 20