Abstract: Some embodiments relate to systems and methods for capacity based DPD optimization. An example method of capacity based DPD optimization includes choosing a DPD adaptation stimulus to facilitate a SNR estimation. The example method also includes initializing DPD coefficients based on setting the DPD coefficients to an initial guess. Additionally, the example method includes estimating the SNR and calculating the cost function based on the estimated SNR; The example method also includes numerically optimizing the DPD coefficients and updating the DPD coefficient set based on the numerical optimization.

Abstract: Some embodiments relate to systems and methods for capacity based DPD optimization. An example method of capacity based DPD optimization includes choosing a DPD adaptation stimulus to facilitate a SNR estimation. The example method also includes initializing DPD coefficients based on setting the DPD coefficients to an initial guess. Additionally, the example method includes estimating the SNR and calculating the cost function based on the estimated SNR; The example method also includes numerically optimizing the DPD coefficients and updating the DPD coefficient set based on the numerical optimization.

Abstract: Disclosed are example embodiments of methods and systems for calibrating the second and third order intermodulation intercept points of a radio transceiver. The calibration circuit comprises: a common mode voltage (VCM) calibration circuit having a complementary to absolute temperature (CTAT) voltage node coupled to one or more VCM nodes of the radio transceiver, wherein the VCM calibration circuit is configured to adjust the CTAT voltage to reduce a third-order intermodulation (IM3) at an output of the radio transceiver; and a bulk terminal calibration circuit configured to bias one of a VBP and VBN voltages at one or more bulk terminals of one or more transistors of the RF circuit to reduce a second-order intermodulation (IM2).

Abstract: A method and apparatus are provided for allocating and transmitting groups of subcarriers, called tiles, between a plurality of transceiver antennas. The method includes receiving at least one downlink signal by a subscriber station transceiver through at least one of the plurality of subscriber station antennas, characterizing a received signal of at least one downlink signal over multiple subcarriers, and allocating tiles for uplink transmission through at least one of the plurality of transceiver antennas. The tiles allocation is based on the characterized received signal of the at least one downlink signal over multiple subcarriers and is based on a required power Ptx for uplink transmission compared with a maximum power P that each of the plurality of the transceiver antennas can emit.

Abstract: The TDMA receiver comprises a control unit for allocating to each of a plurality of transmitters time intervals during which the transmitter is allowed to transmit signals towards the TDMA receiver, a receiving unit for receiving an incoming signal resulting from the multiplexing of different signals which are output by the plurality of transmitters during the allocated time intervals and in the predetermined frequency band, the incoming signal thus consisting, in the predetermined frequency band, of a TDM signal, a processing unit for extracting and processing the TDM signal, and a spectrum determination unit for determining the spectrum of the incoming signal. The control unit is designed to synchronize the operation of the spectrum determination unit as a function of the time intervals allocated to the transmitters for the determination of the spectrum of the incoming signal in the predetermined frequency band.

Abstract: A method and apparatus are provided for allocating and transmitting groups of subcarriers, called tiles, between a plurality of transceiver antennas. The method includes receiving at least one downlink signal by a subscriber station transceiver through at least one of the plurality of subscriber station antennas, characterizing a received signal of at least one downlink signal over multiple subcarriers, and allocating tiles for uplink transmission through at least one of the plurality of transceiver antennas. The tiles allocation is based on the characterized received signal of the at least one downlink signal over multiple subcarriers and is based on a required power Ptx for uplink transmission compared with a maximum power P that each of the plurality of the transceiver antennas can emit.

Abstract: A method of synchronizing a base station of a wireless communication system and a subscriber communication equipment located in the coverage area of the base station by compensating a sampling frequency offset in the subscriber equipment by interpolating input and/or output signals of a radio frequency part of the communication equipment to generate samples corresponding to the original symbol timing of the base station, and compensating the carrier frequency offset from the estimate of the sampling clock error.

Abstract: The method for synchronising a base station of a wireless communication system and a subscriber communication equipment located in the coverage area of the base station comprises the steps of compensating a sampling frequency offset in the subscriber equipment by interpolating input and/or output signals of a radio frequency part (30) of the communication equipment to generate samples corresponding to the original symbol timing of the base station, and compensating the carrier frequency offset from the estimate of the sampling clock error.

Abstract: The TDMA receiver comprises a control unit for allocating to each of a plurality of transmitters time intervals during which the transmitter is allowed to transmit signals towards the TDMA receiver, a receiving unit for receiving an incoming signal resulting from the multiplexing of different signals which are output by the plurality of transmitters during the allocated time intervals and in the predetermined frequency band, the incoming signal thus consisting, in the predetermined frequency band, of a TDM signal, a processing unit for extracting and processing the TDM signal, and a spectrum determination unit for determining the spectrum of the incoming signal. The control unit is designed to synchronize the operation of the spectrum determination unit as a function of the time intervals allocated to the transmitters for the determination of the spectrum of the incoming signal in the predetermined frequency band.

Abstract: A method of inserting a service channel in frames that are plesiochronous relative to the service channel, the method including the steps of transmitting a block clock between a transmitter and a receiver of the frame, and reserving at the transmitter at least one location in the frames for the purpose of conveying the service channel data.

Abstract: The invention relates to a phase-locked loop delivering a recovered clock signal from a reference clock signal F.sub.ref in which some transitions are missing. The loop includes a first divide-by-M frequency divider receiving the clock F.sub.ref and delivering a signal of frequency F.sub.ref /M; a phase comparator providing a phase error signal from the signal of frequency F.sub.ref /M, and the output signal from a second divide-by-M frequency divider; a divide-by-K frequency divider providing a signal of frequency F.sub.k from a local oscillator signal of frequency F.sub.oL receiving the phase error signal as a control signal; an adder-counter of the division ratio p/q receiving the local oscillator signal of frequency F.sub.oL and delivering a signal of frequency F.sub.o equal to F.sub.oL *p/q; a mixer delivering a signal of frequency F.sub.n equal to F.sub.o -F.sub.k on the basis of signal of frequency F.sub.k and the signal of frequency F.sub.o ; and a divide-by-N frequency divider synchronized by F.sub.