Procedure to map DIBITS in Multi-Modulation Systems
Original Publication Date: 2001-Dec-01
Included in the Prior Art Database: 2003-Jul-23
Jürgen Schüling: AUTHOR [+2]
The technical problem refers to changing the modu- lation type during a debit transmission. Until now the problem was solved through the use of several modulators and bit serial processing units.
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Procedure to map DIBITS inMulti-Modulation Systems
Idee: Jürgen Schüling, Bocholt;
Dr. Kalyan Koora, Bocholt
The technical problem refers to changing the modu-lation type during a debit transmission. Until now theproblem was solved through the use of severalmodulators and bit serial processing units.
The mapping of dibits is usually achieved by con-verting the parallel inputs to serial and modulatingthe serial bits. The term dibit is synonym for twoparallel bits to double the process speed. The intro-duced procedure (see figure 1) enables the mappingof dibits independent of the modulation type withoutconverting them either into serial bit current or usingdifferent modulators. The incoming dibits are firststored in register banks. The switch circuit encodesthe dibits depending on the modulation type to thecorresponding constellation bits. After resorting the
dibits they can either be used directly to modulate orstored in registers to pipeline the process. The map-ping can be achieved for example by using look-uptables where the sorted bits are used as a part of ad-dress.
• Doubling of execution time through the use ofdibits instead of serial bits
• Optimal use of logic resources
• Changing of the modulation type during a trans-mission
The idea is the use of dibits not only to increase theprocessing speed but also simplifies the hardwarerealisation by avoiding the use of multiple modula-tors.