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Procedure to demap softdecision bits to dibits in multi-modulation systems Disclosure Number: IPCOM000018052D
Original Publication Date: 2001-Dec-01
Included in the Prior Art Database: 2003-Jul-23
Document File: 1 page(s) / 174K

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Jürgen Schüling: AUTHOR [+2]


The invention consists of a distribution of softdeci- sion bits for dibit processing.

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Procedure to demap softdecisionbits to dibits in multi-modulationsystems

Idee: Jürgen Schüling, Bocholt;

Dr. Kalyan Koora, Bocholt

The invention consists of a distribution of softdeci-sion bits for dibit processing.

At present it is solved  through  the  use  of  severaldemodulators and bit serial processing units.

The decoding of softdecision bits is usually achievedby converting the parallel softdecision inputs to serialand decoding the serial bits. The term dibit is syno-nym für two parallel bits to double the process speed.

The new procedure enables the processing of dibitsindependent of the modulation type without convert-

ing them either into serial bit current or using differ-ent demodulators. The incoming dibits are first storedin  register  banks.  The  switch  circuit  encodes  thesoftdecision bits depending on the modulation type tothe corresponding dibits. After switching the softde-cision bits, they can either be used directly or storedin registers to pipeline the process.

The advantages are a  doubling  of  execution  timethrough  the  use  of  dibits  instead  of  serial  bits, anoptimal use of logic resources and a changing of themodulation type during a transmission.

With this method it is not only possible to increasethe processing speed but also simplifies the hardwarerealisation by avoiding the use of multiple demodu-lators.

In figure 1 you can see an example block diagrammfor demodulate soft and hard decision bits to dibits...