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Procedure to map DIBITS in Multi-Modulation Systems

IP.com Disclosure Number: IPCOM000018050D
Original Publication Date: 2001-Dec-01
Included in the Prior Art Database: 2003-Jul-23
Document File: 1 page(s) / 144K

Publishing Venue

Siemens

Related People

Jürgen Schüling: AUTHOR [+2]

Abstract

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. The mapping of dibits is usually achieved by con- verting the parallel inputs to serial and modulating the serial bits. The term dibit is synonym for two parallel bits to double the process speed. The intro- duced procedure (see figure 1) enables the mapping of dibits independent of the modulation type without converting them either into serial bit current or using different modulators. The incoming dibits are first stored in register banks. The switch circuit encodes the dibits depending on the modulation type to the corresponding constellation bits. After resorting the

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Information / Kommunikation

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.

Advantages:

•� � 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.

An applic...