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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.

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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...