| US 7,499,393 B2 | ||
| Per stream rate control (PSRC) for improving system efficiency in OFDM-MIMO communication systems | ||
| Fatih Ozluturk, Port Washington, N.Y. (US) | ||
| Assigned to InterDigital Technology Corporation, Wilmington, Del. (US) | ||
| Filed on Jul. 26, 2005, as Appl. No. 11/189,649. | ||
| Claims priority of provisional application 60/600742, filed on Aug. 11, 2004. | ||
| Prior Publication US 2006/0034164 A1, Feb. 16, 2006 | ||
| Int. Cl. H04J 11/00 (2006.01) | ||
| U.S. Cl. 370—208 [370/335] | 13 Claims |
| 1. A method for improving efficiency in Orthogonal Frequency Division Multiplexing (OFDM) Multiple-Input, Multiple-Output
(MIMO) wireless communications comprising:
splitting a user-data stream into a plurality of sub-streams in a transmitter;
determining current channel conditions for each of a plurality of sub-carriers;
adaptively selecting a modulation scheme and coding rate for each of the plurality of sub-streams;
modulating and encoding the plurality of sub-carriers with the sub-stream data according to the selected modulation schemes
and coding rates;
allocating the sub-carriers to transmit antennas for transmission; and
transmitting the sub-stream encoded sub-carriers;
wherein the adaptively selecting a modulation scheme and coding rating and allocating the sub-carriers are performed with
regard to each other.
|