Abstract: A transmitter system comprises a mapper that maps data bits and power information to multiple subcarriers, producing mapped information. A first-level modulator receives a portion of this mapped information, converting it into subcarrier specifications defined by complex numbers. A first orthogonal subcarrier generator processes the specifications to generate baseband real and imaginary signals, encompassing part of the subcarriers. These signals are then modulated by a second-level modulator, which produces intermediate-frequency signals. A beamformer receives these signals, adjusting their phase and amplitude for one or more antenna channels to create directed intermediate-frequency signals. The system includes multiple antenna channel modules, each with a digital-to-analog converter that transforms the directed signals into analog form, driving antennas for transmission. This configuration enables efficient modulation and transmission of data across multiple subcarriers.

Abstract: A transmitter system comprises a mapper configured to map data bits and power information to multiple subcarriers, producing mapped information. A first-level modulator converts this mapped information into subcarrier specifications, each defined by a complex number indicating amplitude and phase. The system includes multiple data stream/power channel digital paths, each with a frequency selector that processes a portion of the subcarrier specifications. An orthogonal subcarrier generator translates these specifications from frequency to time domain, generating baseband real and imaginary signals. A second-level modulator processes these signals with intermediate-frequency sine and cosine waves to produce IF I and IF Q signals. A beamformer modifies the phase and/or amplitude of these signals across multiple antenna channels, creating directed signals.

Abstract: A receiver for wireless power and broadband data comprises an energy harvester for extracting wireless power and one or more radio-frequency frontends configured to down-convert a received frequency band to a receiver intermediate frequency (IF) that is frequency and phase aligned with a transmitter IF. The frequency band includes broadband data and wireless power modulated on multiple orthogonal subcarriers. Coupled with the RF frontends, one or more second-level demodulators process a stream of complex values from the down-converted frequency band. A subcarriers demodulator converts these complex values from the time domain to the frequency domain, outputting a series of subcarrier specifications. A first-level demodulator then converts these subcarrier specifications into data bits, which include the broadband data. This configuration enables low-interference reception and processing of both power and data transmitted wirelessly.

Abstract: A transmitter system includes a mapper that maps data bits and power information to N subcarriers. A first-level modulator converts the mapped information of subcarriers into subcarrier specifications, defining their amplitude and phase (or real and imaginary amplitudes). An orthogonal subcarrier generator, for example an IFFT, calculates N successive values of baseband real and imaginary signals. A second-level modulator multiplies the baseband signals with in-phase and quadrature intermediate frequency (IF) components to generate an orthogonal IF signal. A single-sideband (SSB) prep unit may remove the lower or upper sideband. A beam former modifies the phase and/or the amplitude of the orthogonal IF signal for transmission through multiple sub-antennas in a phased array antenna.

Abstract: A technique for enhancing the frequency tuning range for monolithic RF source generation using fully-integrated coupled Voltage-Controlled-Oscillator (VCO) arrays that contain an odd number of VCOs. Fully-monolithic SiGe VCO arrays using on-chip inductor and varactor with on-chip bias current sources have been carefully designed and simulated in IBM 7HP 0.18 ?m BiCMOS technology and taped out for fabrication. The SPICE simulated frequency and phase tuning of the 1-D VCO×5 array is dependent on the edge VCOs termination impedance, the tuning voltages, and the VCO coupling strength. The simulated data suggests that the enhanced tuning range and beam steering can be accomplished using coupled-VCO arrays without needing complex and bulky phase shifters. This design technique imposes no apparent phase noise penalty but can provide simulated RF frequency tuning range of ˜40% and also ˜+/?25° beam steering for active antennas applications.