H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 7/185 (2006.01)
Patent
CA 2495855
Systems and methods are presented for measuring power levels of primary and interfering signals as well as noise, particularly for satellite transmitted signals. A typical method comprises the steps of receiving a signal comprising a primary signal, an interference signal and noise, demodulating the primary signal to remove a carrier frequency, decoding the primary signal to obtain symbols, estimating a power level of the primary signal based upon the demodulated and decoded primary signal. Additionally, an ideal primary signal can be generated from the carrier power and frequency and the symbols and subtracted from the received signal to produce the noise and interference signal. The noise and interference power is then estimated from the noise and interference signal.
L'invention concerne des systèmes et des procédés de mesure de niveaux de puissance de signaux primaires et parasites ainsi que de bruit, notamment pour des signaux transmis par satellite. Un procédé classique comprend les étapes consistant à recevoir un signal contenant un signal primaire, un signal parasite et du bruit, à démoduler le signal primaire afin d'éliminer une fréquence porteuse, à décoder le signal primaire pour obtenir des symboles, à estimer un niveau de puissance du signal primaire basé sur le signal primaire démodulé et décodé. De plus, un signal primaire idéal peut être généré à partir de la puissance de la porteuse et de la fréquence, et les symboles sont soustraits du signal reçu afin de produire le signal de bruit et de parasite. La puissance du bruit et des parasites est alors estimée à partir du signal de bruit et du signal parasite.
Chen Ernest C.
Tran Chinh
Sim & Mcburney
The Directv Group Inc.
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