Abstract
The microprocessor-based implementation of data modems has been attracting a great deal of scientific interest in the past decade. It is a kind of interdisciplinary field where both information theory and microprocessor engineering strongly interact. A number of different microprocessor-based modems are available on the market. Most of the modems with speeds above 2400 bit/s are commonly implemented on bit-slice processors (e.g., AMD 2900) or fast and expensive MOS microprocessors (e.g., TMS 320). For these speeds, it is considered that slow and cheap MOS microprocessors (e.g., Intel 8085) can be used only at the cost of simplifications in the algorithms for signal demodulation and detection, i.e., at the cost of decreased performance. This paper, however, describes a MOS microprocessor-based implementation of the 4800 bit/s modem which was achieved without any deterioration of the modem performance. Both algorithmic details (connected with the processing of signals) and implementational details (connected with the microprocessor-based implementation) are given.
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