CLOSED-LOOP MULTIPLE-INPUT-MULTIPLE-OUTPUT SCHEME FOR WIRELESS COMMUNICATION BASED ON HIERARCHICAL FEEDBACK
First Claim
1. A method implemented in a base station having a plurality of antennas, comprising:
- receiving feedback from at least one user in response to transmitting a first frame to said at least one user, the first frame formed by pre-coding at least one symbol using at least one first code word selected from at least one first code book associated with said at least one user;
transmitting at least one second frame to said at least one user, said at least one second frame being pre-coded using at least one second codeword selected from at least one second codebook, said at least one second codebook being determined based on the feedback and said at least one first codeword.
7 Assignments
0 Petitions
Accused Products
Abstract
The present invention provides methods implemented in a base station having a plurality of antennas and one or more user terminals. One embodiment of the method includes receiving feedback from at least one user in response to transmitting a first frame to said at least one user. The first frame is formed by pre-coding at least one symbol using at least one first code word selected from at least one first code book associated with the at least one user. The method also includes transmitting at least one second frame to the user(s). The second frame(s) are pre-coded using at least one second codeword selected from at least one second codebook. The second codebook(s) determined based on the feedback and the first codeword(s).
-
Citations
17 Claims
-
1. A method implemented in a base station having a plurality of antennas, comprising:
-
receiving feedback from at least one user in response to transmitting a first frame to said at least one user, the first frame formed by pre-coding at least one symbol using at least one first code word selected from at least one first code book associated with said at least one user; transmitting at least one second frame to said at least one user, said at least one second frame being pre-coded using at least one second codeword selected from at least one second codebook, said at least one second codebook being determined based on the feedback and said at least one first codeword. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method implemented in user terminal configured to communicate with a base station having a plurality of antennas, comprising:
-
receiving, from the base station, a first frame formed by pre-coding at least one symbol using a first code word selected from a first code book associated with the user terminal; transmitting information indicative of a second codebook and at least one second codeword selected from the second codebook, the second codebook being determined based on the first codeword. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
-
Specification