Demodulation apparatus and method in a communication system...

H - Electricity – 04 – L

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

H04L 27/34 (2006.01) H04L 25/06 (2006.01) H04L 27/38 (2006.01)

Patent

CA 2425499

Disclosed is a 16-ary QAM (Quadrature Amplitude Modulation) demodulation apparatus. A first calculator decides a soft value .LAMBDA.(Sk,2) of a third demodulated symbol among 4 demodulated symbols by subtracting a distance 2a between two demodulated symbols on the same axis of a mapping table from a level |Yk| of the quadrature-phase component Yk. A second calculator decides a soft value .LAMBDA.(Sk,3) of a fourth demodulated symbol by calculating Yk+.alpha.*Zk using a first variable .alpha.. A third calculator decides a soft value .LAMBDA.(Sk,0) of a first demodulated symbol by subtracting the distance 2a from a level |Yk| of the in-phase component Xk. A fourth calculator decides a soft value .LAMBDA.(Sk,1) of a second demodulated symbol by calculating Xk+$b(b)*Z'k using a second variable .beta..

L'invention concerne un appareil de démodulation à MAQ (modulation d'amplitude en quadrature) à 16 états. Un premier calculateur décide une valeur souple .LAMBDA.(s¿k,2?) d'un troisième symbole démodulé parmi 4 symboles démodulés par soustraction d'une distance 2a entre deux symboles démodulés sur le même axe d'une table de mappage à partir d'un niveau |Y¿k?| de la composante Y¿k? de phase en quadrature. Un second calculateur décide une valeur souple .LAMBDA.(s¿k,3?) d'un quatrième symbole démodulé par calcul de Y¿k?+.alpha.*Z¿k? à l'aide d'une première variable .alpha.. Un troisième calculateur décide une valeur souple .LAMBDA.(s¿k,0?) d'un premier symbole démodulé par soustraction de la distance 2a d'un niveau |X¿k?| de la composante X¿k? en phase. Un quatrième calculateur décide une valeur souple .LAMBDA.(s¿k,1?) d'un second symbole démodulé par calcul de X¿k?+.beta.*Z'¿k? à l'aide d'une seconde variable .beta..

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Demodulation apparatus and method in a communication system... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Demodulation apparatus and method in a communication system..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Demodulation apparatus and method in a communication system... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1626042

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.