Patent ID: 8638875

Claim:
A transmitter comprising: a transmitting module configured to transmit a first set of data streams using N subcarriers when the transmitter operates in a first mode, wherein the first mode includes a single stream mode, a multiple input multiple output mode, a single carrier mode, or an orthogonal frequency division multiplexing mode; and transmit a second set of data streams using M subcarriers when the transmitter operates in a second mode, wherein the second mode includes the single stream mode, the multiple input multiple output mode, the single carrier mode, or the orthogonal frequency division multiplexing mode, wherein the second mode is different than the first mode, and where N and M are integers greater than or equal to 1; a mapping module configured to map the first set of data streams to a first set of antennas of the transmitter based on a first steering matrix generated by the transmitter; and map the second set of data streams to a second set of antennas of the transmitter based on a second steering matrix generated by the transmitter; a channel state determination module configured to determine channel state information in the first mode; and an updating module configured to, in response to the transmitter transitioning from the first mode to the second mode, determine channel state information in the second mode based on an inverse discrete Fourier transform of the channel state information determined in the first mode, and generate the second steering matrix based on (i) the first steering matrix and (ii) the channel state information determined in the second mode.