| US 7,567,621 B2 | ||
| Capacity based rank prediction for MIMO design | ||
| Hemanth Sampath, San Diego, Calif. (US); and Tamer Kadous, San Diego, Calif. (US) | ||
| Assigned to QUALCOMM Incorporated, San Diego, Calif. (US) | ||
| Filed on Dec. 22, 2004, as Appl. No. 11/22,347. | ||
| Claims priority of provisional application 60/590113, filed on Jul. 21, 2004. | ||
| Prior Publication US 2006/0018397 A1, Jan. 26, 2006 | ||
| Int. Cl. H04B 7/06 (2006.01) | ||
| U.S. Cl. 375—267 | 16 Claims |
| 1. A method of rank prediction, comprising:
calculating MIMO channel matrices corresponding to layer transmissions for each tone;
calculating signal-to-noise ratios (SNRs) for each tone based on the MIMO channel matrices;
mapping the SNRs using a mapper for each tone to generate effective SNRs for each layer transmission;
calculating additive white Gaussian noise (AWGN) capacities corresponding to the effective SNRs and denoted as Cap1, Cap2, Cap3, Cap4;
selecting an absolute highest AWGN capacity, Cap;
selecting a rank based on the selected absolute highest Cap; and
transmitting a ranking to transmitting side which indicates the layer transmissions to select for transmission so as to maximize
spectral efficiency.
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