Motorola Corporation

Motorola Mobility LLC

Aaron W Netsell

Neil R Peplinski

Thomas J Kundmann

Thomas J Kovarik

Gregory T Nash

Jason B Onstot

Matthew V Clark

A method, a system and a device for implementing a scalable, self-calibrating and configuring, radio frequency head in a wireless base station that performs phase calibration for coherent combining of a pair of transmitter outputs. Configurable Antenna Calibration (CAC) logic initiates phase calibration for coherent combining by selecting a first configuration and triggering the transmission of a reference signal by radio frequency (RF) transmitters using different sub-carriers. The CAC logic generates a vector of phase values by comparing the reference signal with the respective signals received by a calibration receiver. The CAC logic also generates calibration coefficients for coherent combining by normalizing the phase values. In addition, a passive combiner mechanism is employed to implement coherent combining. The CAC logic performs calibration of smart antennas by providing calibration coefficients via a second configuration which utilizes both a calibration transmitter and the calibration receiver.

Scalable self-calibrating and configuring radio frequency head for a wireless communication system

A method, apparatus, and electronic device for using digital predistortion are disclosed. A first transmittermay send a first signal. A second transmittermay send a second signal. A multipurpose calibration transceivermay execute a first distortion observation of the first signal to be a basis for a first digital predistortion on the first signal and execute a second distortion observation of the second signal to be a basis for a second digital predistortion on the second signal. The multipurpose calibration transceiver may execute a first calibration observation of the first signal and a second calibration observation of the second signal to calibrate the first transmitter and the second transmitter.

Transceiver architecture with combined smart antenna calibration and digital predistortion

A block edge detector () determines () whether a wireless communication transmission with a first modulation having excess spectral emissions will be transmitted at a frequency on a block edge (). In response, a modulator selector () changes () the wireless communication transmission to a second modulation with lessened spectral emissions. Preferably, the second modulator () is operably coupled to an alternative lookup table () wherein phase trajectory entries likely to cause excess spectral emissions such as spurious emissions are smoothed. The entries may be smoothed by filtering, non-linear extrapolation, and/or linear extrapolation. Alternatively, the second modulator () uses an alternative lookup table () that is a GMSK modulator with BT less than 0.3.

Method and apparatus for adaptive modulation of wireless communication signals

In the present technique of duplex local oscillator technique provided, a radio frequency local oscillator frequency and a duplex local oscillator frequency at a selected timeslot are assessed () to provide a radio frequency local oscillator signal () and a duplex local oscillator signal (), respectively. The duplex local oscillator signal and the radio frequency local oscillator signal are mixed () to provide a converted radio frequency local oscillator signal, which is then provided () for output.

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Woodstock, IL, United States of America

Aaron W Netsell