METHOD AND APPARATUS FOR SIGNALING PRECODING VECTORS
First Claim
Patent Images
1. A method to signal a precoding matrix, the method comprising:
- transmitting an estimate of channel state information;
receiving a selected precoding matrix based on at least one channel state information estimate; and
receiving a number indicative of paired wireless transmit/receive units (WTRUs),wherein precoding matrices are distinct and knowledge of a WTRU'"'"'s own precoding vector implies knowledge of any interfering precoding vectors.
1 Assignment
0 Petitions
Accused Products
Abstract
Methods for signaling precoding matrices used at the Node-B for data transmission with multiple user-multiple in multiple out (MU-MIMO) wireless communications. Precoding vectors may be efficiently signaled between wireless transmit/receive units and base stations using control channels, reference signals and blind detection of the precoding information.
42 Citations
32 Claims
-
1. A method to signal a precoding matrix, the method comprising:
-
transmitting an estimate of channel state information; receiving a selected precoding matrix based on at least one channel state information estimate; and receiving a number indicative of paired wireless transmit/receive units (WTRUs), wherein precoding matrices are distinct and knowledge of a WTRU'"'"'s own precoding vector implies knowledge of any interfering precoding vectors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A method to signal a precoding matrix, the method comprising:
-
transmitting an estimate of channel state information; receiving a reference signal (RS) having at least one precoded precoding vector that is based on at least one channel state information estimate; and estimating at least one precoding vector from a received reference signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
-
-
28. A method to signal a precoding matrix, the method comprising:
-
transmitting an estimate of channel state information; receiving a reference signal (RS) having a non-target WTRU precoded channel vector that is based on at least one channel state information estimate; and computing at least one precoding vector from a received reference signal.
-
-
29. A method to signal a precoding matrix, the method comprising:
-
selecting a precoding vector from a unitary matrix from a unitary codebook; transmitting an index of this unitary vector with a CQI; and receiving a confirmation message based on other precoding vectors and wireless transmit/receive pairings and on condition that the confirmation message is negative, further receiving another precoding vector, wherein the unitary codebook comprises unitary matrices and each matrix includes potential precoding vectors. - View Dependent Claims (30, 31)
-
-
32. A wireless transmit/receive unit (WTRU) using precoding matrix signaling, comprising:
-
a transmitter transmitting an estimate of channel state information; a receiver receiving a selected precoding matrix based on at least one channel state information estimate; and the receiver receiving a number of paired wireless transmit/receive units (WTRUs), wherein precoding matrices are distinct and knowledge of a WTRU'"'"'s own precoding vector implies knowledge of any interfering precoding vectors.
-
Specification