Amplitude and phase matching for layered modulation reception

H - Electricity – 04 – B

Patent

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Details

H04B 7/212 (2006.01) H04B 3/04 (2006.01) H04B 7/005 (2006.01) H04B 7/204 (2006.01) H04L 27/06 (2006.01) H04L 29/02 (2006.01) H04N 5/76 (2006.01) H04Q 7/20 (2006.01)

Patent

CA 2502867

An apparatus and method for receiving layered modulation signals is disclosed. A typical method includes receiving a layered modulation signal (602) including an upper layer signal and a lower layer signal, demodulating and decoding (604) the upper layer signal from the received layered modulation signal, estimating an upper layer amplitude factor and an upper layer phase factor (618) from the received layered modulation signal. A substantially ideal upper layer signal is reconstructed from the demodulated and decoded upper layer signal including matching an ideal amplitude and an ideal phase (620) by applying the upper layer amplitude factor and the upper layer phase factor to the reconstructed ideal upper layer signal. Finally, the reconstructed ideal upper layer signal is subtracted from the received layered modulation signal (622) to produce the lower layer signal for processing.

L'invention concerne un appareil et un procédé permettant de recevoir des signaux de modulation en couches. Un procédé typique consiste à recevoir un signal de modulation en couches (602) comprenant un signal de couche supérieure et un signal de couche inférieure, à démoduler et à décoder (604) le signal de couche supérieure à partir du signal de modulation en couches reçu, à estimer un facteur d'amplitude de couche supérieure et un facteur de phase de couche supérieure (618) à partir du signal de modulation en couches reçu. Un signal de couche supérieure pratiquement idéal est reconstruit à partir du signal de couche supérieure décodé et démodulé. Pour ce faire, une amplitude idéale et une phase idéale (620) sont synchronisées par application du facteur d'amplitude de couche supérieure et du facteur de phase de couche supérieure au signal idéal reconstruit de couche supérieure. Finalement, le signal reconstruit idéal de couche supérieur est soustrait du signal de modulation en couches reçu (622) de manière à produire le signal de couche inférieure à traiter.

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