Digital Signal Processing for Wireless Application: DSP IP core is dominant
If we look back in the early 90’s, when the Global System for Mobile Communication (GSM) standard was just an emerging technology, the main innovation was the move from Analog to the Digital Processing of the Signal (DSP), allowing to make unlimited manipulation to an Analog signal, once digitized by the means of a converter (ADC). To run the Digital baseband Processing (see picture), the system designer had to implement the Vocoder, Channel codec, Interleaving, Ciphering, Burst formatting, Demodulator and (Viterbi) Equalizer. Digital Signal Processing science was already heavily used for military application like Radar, but was emerging in telecommunication. The very first GSM mobile handset built based on standard part (ASSP) were using no less than three TI 320C25 DSP, each of them costing several dozen of dollar!
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