| US 7,477,699 B2 | ||
| Transmission technique selector for radio communication systems with multiple transmit and multiple receive antennas | ||
| Fan Wang, Chicago, Ill. (US); Lawrence A. Downing, Hoffman Estates, Ill. (US); Amitava Ghosh, Buffalo Grove, Ill. (US); Chandrasekar Sankaran, Arlington Heights, Ill. (US); and Jun Tan, Lake Zurich, Ill. (US) | ||
| Assigned to Motorola, Inc., Schaumburg, Ill. (US) | ||
| Filed on Dec. 20, 2006, as Appl. No. 11/613,349. | ||
| Prior Publication US 2008/0151804 A1, Jun. 26, 2008 | ||
| Int. Cl. H04B 7/02 (2006.01); H04L 1/02 (2006.01) | ||
| U.S. Cl. 375—267 [375/260; 375/299; 375/347; 455/101; 455/103; 455/69; 455/104] | 20 Claims |
| 1. A method for selecting a multiple input multiple output transmission technique for a radio communication system with multiple
transmit and multiple receive antennas, the method comprising:
estimating, based upon a first signal to interference and noise ratio determined for at least one tone in a multiple transmit
and multiple receive antennas radio channel using a space time coding technique, a first data throughput of the at least one
multiple transmit and multiple receive antennas radio channel using the space time coding technique;
estimating, based upon a second signal to interference and noise ratio determined for at least one tone in a multiple transmit
and multiple receive antennas radio channel using a spatial multiplexing technique, a second data throughput of the at least
one multiple transmit and multiple receive antennas radio channel corresponding to using the spatial multiplexing technique,
wherein the spatial multiplexing technique communicates a plurality of data stream layers through the at least one multiple
transmit and multiple receive antennas radio channel;
determining, based upon the first signal to interference and noise ratio and the second signal to interference and noise ratio,
that the second data throughput is greater than the first data throughput and that a third data throughput of each layer within
the plurality of data stream layers is greater than a threshold;
selecting, in response to determining that the second data throughput is greater than the first data throughput and that the
third data throughput of each layer within the plurality of data stream layers is greater than a threshold, the spatial multiplexing
technique as a selected technique;
selecting, in response to determining that at least one of the second data throughput is not greater than the first data throughput
and that the third data throughput of at least one layer of data streams based upon the second signal to interference and
noise ratio is not greater than the threshold, the space time coding technique as the selected technique; and
communicating by a receiver, the selected technique and at least one corresponding channel quality indices to a transmitter.
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