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The number of modulation methods using I/Q in mobile communication systems has increased rapidly in the past few years. Examples are GSM, now in use worldwide, and the American mobile radio standard NADC. The generation of test signals for these systems is taking more and more time, since just familiarizing with a particular standard can be so time-consuming. With the definition of mobile radio standards of the third generation, the demand for new methods of modulation and channel access is greater than ever.
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