Antenna divison multiple access
First Claim
1. A method of communication among at least three nodes, each node including a plurality of antennas, the method comprising the steps of:
- (a) each of at least one transmitting node transmitting a first respective message to a destination node of said first respective message, using at least one antenna of said each transmitting node;
(b) one of said at least one transmitting node transmitting a second message to a destination node of said second message, using at least one other antenna of said one transmitting node, said destination node of said second message being different from said destination node of said first message;
wherein all said transmitting is effected substantially simultaneously; and
(c) at one of said nodes;
(i) receiving at least two said messages as a received signal; and
(ii) extracting, from said received signal, at least one of said messages for which said one node is a destination node, said extracting being effected using a spatial demultiplexing algorithm.
1 Assignment
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Accused Products
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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Citations
16 Claims
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1. A method of communication among at least three nodes, each node including a plurality of antennas, the method comprising the steps of:
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(a) each of at least one transmitting node transmitting a first respective message to a destination node of said first respective message, using at least one antenna of said each transmitting node;
(b) one of said at least one transmitting node transmitting a second message to a destination node of said second message, using at least one other antenna of said one transmitting node, said destination node of said second message being different from said destination node of said first message;
wherein all said transmitting is effected substantially simultaneously; and
(c) at one of said nodes;
(i) receiving at least two said messages as a received signal; and
(ii) extracting, from said received signal, at least one of said messages for which said one node is a destination node, said extracting being effected using a spatial demultiplexing algorithm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of communication among at least three nodes, each node including a plurality of antennas, the method comprising the steps of:
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(a) each of at least two transmitting nodes substantially simultaneously transmitting a respective message to a common destination node, using at least one antenna of said each transmitting node; and
(b) said common destination node;
(i) receiving said messages as a received signal using at least as many of the antennas of said common destination node as a total number of antennas that are used by said at least two transmitting nodes to transmit said messages, and (ii) extracting at least one of said messages from said signal using a spatial demultiplexing algorithm.
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Specification