Phase combining method and apparatus for use in a diversity...

H - Electricity – 04 – B

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H04B 1/10 (2006.01) H04B 7/08 (2006.01)

Patent

CA 2095717

A phase combining method and apparatus for use in a diversity reception radiotelephone is described. The phase combining method and apparatus is a hybrid diversity technique which combines elements of maximal ratio combining (MRC) and level comparison selection diversity, which results in a simple and effective implementation of a diversity receiver with superior performance. The diversity receiver demodulates the received signals (115, 117), extracts the phase, forming two phase signals (209, 211). Then, the two phase signals (209, 211) are combined to form a third phase signal (213). One of the three phase signals is selected to be used for interpretation of a symbol in the Quadrature Phase Shift Keying (QPSK) constellation. The selection process is based on the received signal strength of the received signals.

L'invention décrit un procédé et un appareil de combinaison de phase s'utilisant dans un radiotéléphone de réception en diversité . Le procédé et l'appareil de combinaison de phase représentent une technique de diversité hybride combinant des éléments de combinaison à rapport maximal (MRC) et de diversité de sélection de comparaison de niveau, ce qui permet de réaliser une mise en application simple et efficace d'un récepteur en diversité, ainsi que d'en accroître les performances. Le réception en diversité démodule les signaux reçus (115, 117), extrait la phase, ce qui constitue deux signaux de phase (209, 211). Ensuite, les deux signaux de phase (209, 211) sont combinés de façon à produire un troisième signal de phase (213). Un des trois signaux de phase est sélectionné, afin de s'utiliser pour interpréter un symbole de la constellation de modulation par déplacement de phase en quadrature (MDPQ). Le processus de sélection se base sur la force des signaux reçus.

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