Phase noise and additive noise estimation in a qam demodulator

Details Phase noise and additive noise estimation in a qam demodulator Phase noise and additive noise estimation in a qam demodulator

H - Electricity

04

L

H04L 27/38 (2006.01) H04L 27/00 (2006.01)

Patent

CA 2370546

A QAM demodulator having a carrier recovery circuit (50) that includes a phase estimation circuit (506) and an additive noise estimation circuit (507) which produces an estimation of the residual phase noise (518) and additive noise (519) viewed by the QAM demodulator. The phase noise estimation (518) is based on the least mean square error (512) between the QAM symbol (509) decided by a symbol decision circuit (508) and the received QAM symbol (504). The additive noise estimation is based on the same error as in the phase noise estimation (518), except that it is based only on QAM symbols having the minimum amplitude on the I and Q coordinates. The additive noise estimation (519) is not dependent on the phase of the signal, thus, is independent of the phase noise estimator.

L'invention porte sur un démodulateur MAQ possédant un circuit de récupération de porteuse (50) qui comprend un circuit d'estimation de phase (506) et un circuit d'estimation de bruit additif (507) générant une estimation du bruit de phase résiduel (518) et du bruit additif (519) détecté par le démodulateur MAQ. L'estimation du bruit de phase (518) est effectuée sur la base de l'erreur quadratique moyenne minimale (512) entre le symbole MAQ (509) décidé par un circuit de décision de symbole (508) et le symbole MAQ reçu (504). L'estimation de bruit additif est effectuée sur la base de la même erreur que celle de l'estimation de bruit de phase (518), sauf si elle est basée uniquement sur des symboles MAQ ayant l'amplitude minimum sur les coordonnées I et Q. L'estimation de bruit additif (519) ne dépend pas de la phase du signal.

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