Methods for optimal collaborative MIMO-SDMA
First Claim
1. A method for designing beamforming vectors for a collaborative space division multiple access system, comprising:
- assembling at a base station m channel matrices for m subscriber stations;
defining a beamformer vector space; and
searching the beamformer vector space to select a weighting beamforming vector w and a combining beamforming vector v for each subscriber station by maximizing a predetermined performance metric.
8 Assignments
0 Petitions
Accused Products
Abstract
A system and method for collaboratively designing optimized beamforming vectors is disclosed for a wireless multiple input, multiple output (MIMO) space division multiple access (SDMA) communication system to optimize an aggregate SNR performance metric across the different users, thereby permitting the flexibility to trade off computational requirements and size of control information exchanged with performance. Using adaptive vector space search methods, the space of all receive beamformers is searched to find the set which maximizes either the sum or product of SNRs of the users.
-
Citations
24 Claims
-
1. A method for designing beamforming vectors for a collaborative space division multiple access system, comprising:
-
assembling at a base station m channel matrices for m subscriber stations; defining a beamformer vector space; and searching the beamformer vector space to select a weighting beamforming vector w and a combining beamforming vector v for each subscriber station by maximizing a predetermined performance metric. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A base station comprising:
-
a plurality of antennas for transmitting one or more signals to m subscriber stations over m channels represented by a corresponding m channel matrices, respectively; and a module for jointly designing a pair of combining and weighting beamformers for each subscriber station (v1, . . . , vm;
w1, . . . , wm) by;searching a space of combining beamformers derived from the m channel matrices to find a set of combining beamformers (v1, . . . , vm) which maximizes a predetermined performance metric; deriving a weighting beamformer from each combining beamformer to form a set of weighting beamformers (w1, . . . , wm); and feeding forward to each of the m subscriber stations a corresponding combining or weighting beamformer that has been designed for said subscriber station. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
-
-
24. A wireless communication method using beamforming for a collaborative, multiple input, multiple output (MIMO) space division multiple access (SDMA) system, the method comprising:
-
defining a V space of combining beamforming vectors (v1, . . . , vm) for a plurality of m subscriber stations based upon channel estimate information obtained from the m subscriber stations; searching the V space to find a set of combining beamforming vectors that maximizes a predetermined performance metric that is a function of SNRs of the m subscriber stations; and deriving, for each set of combining beamforming vectors, the weighting beamforming vectors using a pseudo inverse solution.
-
Specification