DSP Based Implementation of Scrambler for 56Kbps Modem

Scrambler is generally employed in data communication systems to add redundancy in the transmitted data stream so that at the receiver end, timing information can be retrieved to aid the synchronization between data terminals. Present paper deals with simulation and implementation of the scrambler for 56Kbps voice-band modem. Scrambler for the transmitter of 56Kbps modem was chosen as a case study. Simulation has been carried out using Simulink of Matlab. An algorithm for the scrambling function has been developed and implemented on Texas Instrument’s based TMS320C50PQ57 Digital Signal Processor (DSP). Signalogic DSP software has been used to compare the simulated and practical results.