Antenna division multiple access
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United States of America Patent
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Dec 8, 2009
Grant Date -
Sep 8, 2005
app pub date -
Mar 7, 2005
filing date -
Mar 5, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
Three or more nodes, each with a plurality of antennas, communicate by transmitting messages simultaneously to each other. One of the nodes transmits two messages to two different destination nodes using different sets of its antennas. A receiving node receives at least two of the messages as a received signal, and uses a spatial demultiplexing algorithm such as VBLAST to extract from the received signal at least one message for which the receiving node is a destination node. Before the messages are transmitted, it is decided how many of its antennas each node is allowed to use to transmit each of its messages. For that purpose, the nodes exchange RTSs (Request To Send messages) and CTSs (Clear To Send messages). Collisions among the nodes are resolved. A transmission power and a route are selected for each message.
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