Timeslot sharing using unbalanced qpsk modulation

H - Electricity – 04 – L

Patent

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Details

H04L 27/20 (2006.01) H04B 7/26 (2006.01) H04L 1/00 (2006.01)

Patent

CA 2713991

In a radio transmission scheme reusing slots such as by using Orthogonal Sub Channels (OSC) in the downlink channel a parameterized, hybrid quaternary modulation is employed. In the hybrid quadrature modulation, the symbol constellation is in quadrature, with the 4 symbols lying on the unit circle in the complex plane. The orthogonality of the 1 and Q branches is preserved. A cross power branch ratio parameter a is introduced, allowing the total energy of the signal to be divided unequally between the two sub channels. This parameter .ALPHA. may be changed from over time.

La présente invention concerne l'emploi d'une modulation quaternaire hybride paramétrée dans un schéma de radio-transmission réutilisant des créneaux comme on le fait en utilisant des sous-canaux orthogonaux ou "OSC" (Orthogonal Sub Channel). En modulation en quadrature, la constellation de symboles est en quadrature, les 4 symboles se trouvant dans le cercle d'unité du plan complexe. L'orthogonalité des branches 1 et Q est préservée. On a introduit un paramètre a de rapport de branches de puissance croisées, ce qui permet de diviser l'énergie totale du signal de façon inégale entre les deux sous canaux. Ce paramètre a peut être modifié en fonction de critères de temps.

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