Adaptive modulation in a multiple input multiple output...

Details Adaptive modulation in a multiple input multiple output... Adaptive modulation in a multiple input multiple output...

2005-10-06

2011-12-27

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Transmitters

Plural diversity

C375S260000, C375S350000

Reexamination Certificate

active

08085871

ABSTRACT:
A transmitting MIMO wireless device transmits a training sequence to a receiving MIMO wireless device. The receiving MIMO wireless device estimates a channel response based upon the training sequence, determines an estimated transmitter beamforming unitary matrix and a transmit path quality matrix, and then transmits some/all of these parameters to the transmitting MIMO wireless device. The transmitting MIMO wireless device receives these components and determines a modulation to be employed for each of a plurality of data streams. The transmitting MIMO wireless device transmits a data frame to the receiving MIMO wireless device that includes a short training sequence, a long training sequence, a signal field with demodulation control signals, and a data payload for each of multiple data streams. According to one embodiment of the signal field, the signal field indicates a number of data streams of the data frame and a modulation employed for each data stream. The signal field may include additional information, such as whether beamforming is employed for the data frame.

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