Method and apparatus for performing spatial-division multiple access
AssigneeMotorola, Inc.
InventorsBishwarup Mondal, Xiangyang Zhuang, Kevin Baum, Timothy Thomas, Frederick Vook
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Abstract
A method and apparatus for performing spatial-division multiple access within a communication system is provided herein. During operation, nodes will return null subspace information along with their channel subspace information. The null subspace is similar to the channel subspace except that the null subspace information directs a base station to the matrix in a predefined codebook that results in minimum power being received at the node. The null subspace for each node is taken into consideration when communicating with a particular node.
Claims20
A method comprising the steps of:
- transmitting pilot data to a first and a second node from multiple antennas;
- receiving a first and a second channel subspace information from the first and the second nodes in response to the transmission;
- receiving first and second null subspace information from the node in response to the transmission;
- utilizing the first channel subspace information and the second null subspace information to determine antenna weights for the first node;
- utilizing the second channel subspace information and the first null subspace information to determine antenna weights for the second node;
- and
- transmitting data to the first and the second nodes simultaneously utilizing the first and the second antenna weights, respectively.
A method comprising the steps of:
- receiving pilot data from a base station that is transmitted from multiple antennas;
- determining channel subspace information based on the received pilot data;
- determining null subspace information based on the received pilot data;
- and
- transmitting the channel subspace information and the null subspace information for use by the base station in determining antenna weights.
An apparatus comprising:
- a transmitter transmitting pilot data;
- a receiver receiving first and second channel subspace information from a first and a second node and first and second null subspace information from the first and the second node;
- and
- stream weighting circuitry utilizing the first channel subspace information and the second null subspace information to determine first antenna/stream weights for the first node, the stream weighting circuitry additionally utilizing the second channel subspace information and the first null subspace information to determine second antenna/stream weights for the second node.
An apparatus comprising:
- a receiver receiving pilot data from a base station that is transmitted from multiple antennas;
- logic circuitry determining channel subspace information based on the received pilot data and determining null subspace information based on the received pilot data;
- and
- transmitting circuitry transmitting the channel subspace information and the null subspace information for use by the base station in determining antenna weights.
Dependencies are inferred from the claim text.