Abstract: 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.

Abstract: 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.

Abstract: A communication device is provided that is capable of operating in an OFDM or communication system and that provides for cancellation of in-band spurs. The communication device identifies a bin of multiple bins associated with an output of an inverse transformer and comprising a spur and estimates one or more spur phase parameters and a spur amplitude in association with the identified bin. In one embodiment of the present invention, the one or more spur phase parameters includes a spur initial phase and a spur change rate. When the communication device receives a signal from another communication device, the communication device transforms the received signal to produce a multiple parallel output signals that are each associated with a bin of the multiple bins and cancels a spur in an output signal associated with the identified bin based on the estimated one or more spur phase parameters and spur amplitude.

Abstract: A communication device is provided that is capable of operating in an OFDM or communication system and that provides for cancellation of in-band spurs. The communication device identifies a bin of multiple bins associated with an output of an inverse transformer and comprising a spur and estimates one or more spur phase parameters and a spur amplitude in association with the identified bin. In one embodiment of the present invention, the one or more spur phase parameters includes a spur initial phase and a spur change rate. When the communication device receives a signal from another communication device, the communication device transforms the received signal to produce a multiple parallel output signals that are each associated with a bin of the multiple bins and cancels a spur in an output signal associated with the identified bin based on the estimated one or more spur phase parameters and spur amplitude.

Abstract: An access point (108) in a dual-frequency TDD communication system (100) includes a transceiver (122) that transmits information to a first group of subscriber devices (104a-n) at a first frequency (f1) and contemporaneously receives information from a second group of a subscriber devices (106a-n) at a second frequency (f2) during at least a portion of a period of time (T1). The access point (108) also transmits information to the second group of subscriber devices (106a-n) at the second frequency (f2) and contemporaneously receives information from the first group of subscriber devices (104a-n) at the first frequency (f1) during at least a portion of a second period of time (T3). A method for performing a dual-frequency communication scheme is also provided.

Abstract: In a Time Division Multiple Access System, multiple offset values are provided to a divider control circuit (213) of a fractional-N synthesizer (200) by utilizing a microprocessor (305). The microprocessor (305) utilizes timeslot information provided to it by a timeslot selector (301), frequency information provided to it by a frequency selector (303) and a read-only memory (307), to provide offset values to the divider control circuit (213).