Patent ID: 8130855

Claim:
A transmitting device comprising: a circuit configured to select to transmit data symbols between at least a closed loop mode and an open loop mode using four antenna outputs; wherein each antenna output is operatively coupled to at least one antenna; wherein in the open loop mode, the circuit is further configured to process data symbols to be output to the four antenna outputs for one orthogonal frequency division multiplex (OFDM) symbol; wherein the one OFDM symbol has K subcarriers and the K subcarriers are divided into L groups of subcarriers; wherein L is greater than one; wherein for each of the L groups, four data symbols are space frequency block coded; wherein a first pair of the four symbols is space frequency block coded to produce four SFBC symbols outputted to a first and second antenna output for transmission and not a third and forth antenna output of the four antenna outputs; wherein a second pair of the four data symbols is space frequency block coded to produce four SFBC symbols outputted to a third and forth antenna output for transmission and not a first and second antenna output of the four antenna outputs; and wherein in the closed loop mode, the circuit is further configured to receive information transmitted by a receiving device; wherein the received information includes at least a channel quality indicator (CQI) indicating a modulation and coding set; wherein data is transmitted using spatial multiplexing as data symbols; wherein each data symbol is transmitted using a plurality of subcarriers; wherein the data symbols are provided to the four antenna outputs for transmission using a number of streams and a modulation and coding set derived at least in part from the received information.