Method of precoding with a codebook for a wireless system
First Claim
1. A transmitter used in a wireless communications system, the transmitter comprising:
- a precoding unit to precode data with a precoding matrix selected from a codebook comprising matrices that are expressed as
2 Assignments
0 Petitions
Accused Products
Abstract
A quantized multi-rank beamforming scheme for multiple-antenna systems such as a multiple-input-multiple-output (MIMO) wireless downlink. User equipment (UE) estimates downlink channel and transmit power and determines rank and power allocations. A quantized beamforming matrix is then determined by the UE using successive beamforming. The UE also determines channel quality indices (CQI) which it feeds-back to the wireless downlink base station along with the index of the quantized beamforming matrix. The base station uses the CQI information to select a UE for scheduling of downlink transmission and the quantized beamforming matrix index received from the selected UE to beamform the downlink transmission to the UE. Base station overhead and is minimized while providing near-optimal performance given the constraints of a limited feed-back channel and computational complexity of the UE.
-
Citations
31 Claims
-
1. A transmitter used in a wireless communications system, the transmitter comprising:
a precoding unit to precode data with a precoding matrix selected from a codebook comprising matrices that are expressed as - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
9. A receiver used in a wireless communications system, the receiver comprising:
a receiving unit to receive, from a transmitter, data precoded with a precoding matrix selected from a codebook comprising matrices that are expressed as - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
17. A receiver used in a wireless communications system, the receiver comprising:
a feedback unit to provide feedback information for transmission in order for a transmitter to select a precoding matrix from a codebook comprising matrices that are expressed as - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
-
26. A wireless communications system comprising:
a transmitter to precode data with a precoding matrix selected from a codebook comprising matrices that are expressed as - View Dependent Claims (27, 28)
-
29. A wireless communications system comprising:
-
a transmitter to receive feedback information for transmission; and a receiver to provide the feedback information in order for the transmitter to select a precoding matrix from a codebook comprising matrices that are expressed as - View Dependent Claims (30, 31)
-
Specification