Patent ID: 8184679

Claim:
A radio frequency (RF) transceiver having adaptive modulation, the RF transceiver comprises: an RF front-end operably coupled to convert a plurality of streams of outbound baseband signals into outbound RF signals and to convert inbound RF signals into a plurality of streams of inbound baseband signals; a baseband transmitter section including: an encoding module operably coupled to encode outbound data to produce encoded data; an interleaving module operably coupled to interleave the encoded data into a plurality of interleaved encoded data streams; a plurality of symbol mapping modules operably coupled to map, in accordance with a plurality of modulation control signals, the plurality of interleaved encoded data streams into a plurality of streams of symbols; a beamforming module operably coupled to multiply the plurality of streams of symbols by a unitary beamforming matrix to produce a plurality of beamformed streams of symbols, wherein the unitary beamforming matrix is determined based on a multiple path channel estimation from a receiver feedback signal from another RF transceiver; and a plurality of inverse fast Fourier transform modules operably coupled to convert the plurality of beamformed streams of symbols from a frequency domain to a time domain to produce the plurality of streams of outbound baseband signals; and a modulation control module operably coupled to produce the plurality of modulation control signals, wherein the plurality of modulation control signals are determined based on the multiple path channel estimation from the receiver feedback signal from the another RF transceiver, wherein the modulation control module functions to determine the plurality of modulation control signals by: determining a signal to noise ratio for each transmit path based on a corresponding portion of the multiple path channel estimation from the receiver feedback signal; in response to the signal to noise ratio determined for each transmit path, determining a modulation scheme for each transmit path; and producing the plurality of modulation control signals in response to the modulation scheme determined for each transmit path.