Methods and apparatus for improved utilization of air link...

H - Electricity – 04 – L

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H04L 5/02 (2006.01) H04B 7/005 (2006.01) H04B 7/06 (2006.01) H04B 14/02 (2006.01) H04L 1/00 (2006.01) H04L 25/02 (2006.01) H04L 25/49 (2006.01) H04L 27/26 (2006.01)

Patent

CA 2681618

Methods and apparatus for improving the utilization of air link resources in a wireless communications system, e.g., an OFDM MIMO system, including a base station with multiple transmit antennas are described. Superposition signaling in the downlink is employed. The superimposed signal includes a first transform result signal and a second lower power signal. The first transform result signal is generated from a first signal, which uses position modulation, e.g., including null components and high power non-null components. Different components of the first transform result signal are directed to different transmit antennas. The first transform result signal communicates information to a first wireless terminal, e.g., a weak receiver. The non-null received elements of the first transform result signal are utilized by a second wireless terminal, e.g., a superior receiver, as pilots to determine a channel estimate. The second wireless terminal uses the determined channel estimate to demodulate received second signals.

La présente invention concerne des procédés et un appareil qui permettent d'améliorer l'utilisation de ressources de liaison aérienne dans un système de communication sans fil, par exemple, un système OFDM MIMO, comprenant une station de base comportant plusieurs antennes d'émission. On utilise une signalisation par superposition dans la liaison descendante. Le signal superposé comprend un premier signal de résultat de transformation et un second signal moins puissant. Le premier signal de résultat de transformation est généré à partir d'un premier signal qui utilise la modulation de position, par exemple, comprenant des composantes nulles et des composantes non nulles à forte puissance. Différentes composantes du premier signal de résultat de transformation sont dirigées vers différentes antennes d'émission. Le premier signal de résultat de transformation communique des informations à un premier terminal sans fil, par exemple, un récepteur faible. Les éléments reçus non nuls du premier signal de résultat de transformation sont utilisés par un second terminal sans fil, par exemple, un récepteur plus puissant, en tant que pilotes pour déterminer une estimation des voies. Le second terminal sans fil utilise l'estimation des voies déterminée pour démoduler des seconds signaux reçus.

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