Abstract: A method of fabricating and tuning a surface integrated waveguide (SIW) filter incudes covering upper and lower surfaces of a dielectric substrate with a metallic layer. The method includes drilling a plurality of vias on the dielectric substrate and covering the vias with the metallic layer, wherein a first group of vias forms one or more cavity resonators, a second group of vias defines coupling channels between the cavity resonators, a third group of vias defines an effective width and a fourth group of vias defines an effective length of the cavity resonators. The method includes varying a center frequency by increasing diameters of the second group of vias to decrease the width of the coupling channels and varying a roll-off by increasing diameters of the third and fourth groups of vias to decrease the effective width and the effective length of the resonators.

Abstract: Disclosed is a system for mitigating unwanted emissions in an integrated antenna in which the uplink and downlink RF processing chains are located in close proximity and shielding is impractical. The system involves orienting the uplink and downlink processing chains and physically locating them relative to each other so that applying selective phase biases to their local oscillators results in local oscillator leakage from adjacent RF processing chains to have an out of phase relationship relative to each other. This mitigates unwanted emission from local oscillator signals leakage from the RF processing chains' mixers by angularly dispersing the unwanted emissions and attenuating the unwanted emissions through destructive interference.

Abstract: A method of fabricating and tuning a surface integrated waveguide (SIW) filter incudes covering upper and lower surfaces of a dielectric substrate with a metallic layer. The method includes drilling a plurality of vias on the dielectric substrate and covering the vias with the metallic layer, wherein a first group of vias forms one or more cavity resonators, a second group of vias defines coupling channels between the cavity resonators, a third group of vias defines an effective width and a fourth group of vias defines an effective length of the cavity resonators. The method includes varying a center frequency by increasing diameters of the second group of vias to decrease the width of the coupling channels and varying a roll-off by increasing diameters of the third and fourth groups of vias to decrease the effective width and the effective length of the resonators.

Abstract: Selective crest factor reduction and digital pre-distortion of physical channels and physical signals in a wireless communication network are disclosed. A method for wireless communication includes allocating transmission bandwidths for physical channels and physical signals and determining if the total allocated transmission bandwidth for the physical channels and the physical signals is less than or equal to a first bandwidth threshold value. If the total allocated transmission bandwidth is less than or equal to the first bandwidth threshold value, the method includes digitally pre-distorting the physical channels and the physical signals and transmitting the digitally pre-distorted physical channels and physical signals. The method also includes applying digital crest factor reduction to the physical channels and the physical signals if the total allocated transmission bandwidth is less than or equal to a second bandwidth threshold value.

Abstract: Selective crest factor reduction and digital pre-distortion of physical channels and physical signals in a wireless communication network are disclosed. A method for wireless communication includes allocating transmission bandwidths for physical channels and physical signals and determining if the total allocated transmission bandwidth for the physical channels and the physical signals is less than or equal to a first bandwidth threshold value. If the total allocated transmission bandwidth is less than or equal to the first bandwidth threshold value, the method includes digitally pre-distorting the physical channels and the physical signals and transmitting the digitally pre-distorted physical channels and physical signals. The method also includes applying digital crest factor reduction to the physical channels and the physical signals if the total allocated transmission bandwidth is less than or equal to a second bandwidth threshold value.

Abstract: A method for wireless communication includes allocating a transmission bandwidth for transmission to a user equipment (UE). The method further includes determining if the allocated transmission bandwidth is less than or equal to a maximum estimated BWDPD. The maximum estimated BWDPD is the maximum estimated signal bandwidth that a transmitter is configured to digitally pre-distort. The method also includes digitally pre-distorting transmit signals and transmitting the digitally pre-distorted transmit signals to the UE if the allocated transmission bandwidth is less than or equal to the maximum estimated BWDPD. The method also includes transmitting to the UE without digitally pre-distorting the signals if the allocated transmission bandwidth is not less than or equal to the maximum estimated BWDPD. The method also includes applying digital crest factor reduction to the transmit signals if the allocated transmission bandwidth is less than or equal to the maximum estimated BWCFR.

Abstract: A method of wireless communication includes receiving a plurality of first downlink signals at a first radio base station, where the plurality of first downlink signals each has a different frequency. The method further includes down-converting the plurality of first downlink signals to a plurality of second downlink signals, where the plurality of second downlink signals have a same frequency. The method also includes transmitting the plurality of second downlink signals to associated user equipments (UEs).

Abstract: A portable millimeter-wave wireless communications device relies on millimeter-wave spectrum for wireless communications. The millimeter-wave device may be a smart-phone, a laptop computer or a tablet computer. The millimeter-wave device may be a module that is added to an existing portable device such as a smart-phone, a laptop computer or a tablet computer to provide millimeter-wave communications capability. The module may be incorporated into a protective encapsulating case of such portable devices.

Abstract: A method for fabricating a printed circuit board (PCB) antenna includes fabricating a first unit, wherein fabricating the first unit comprises forming a first dielectric substrate layer and forming one or more first radiating elements disposed on the first dielectric substrate layer. The method includes fabricating a second unit, wherein fabricating the second unit comprises forming a ground plane layer, forming a second dielectric substrate layer disposed on the ground plane layer and forming antenna feed lines disposed on the second dielectric substrate layer. The method includes integrating the first unit and the second unit by placing the first dielectric substrate layer on the antenna feed lines.

Abstract: A portable millimeter-wave wireless communications device relies on millimeter-wave spectrum for wireless communications. The millimeter-wave device may be a smart-phone, a laptop computer or a tablet computer. The millimeter-wave device may be a module that is added to an existing portable device such as a smart-phone, a laptop computer or a tablet computer to provide millimeter-wave communications capability. The module may be incorporated into a protective encapsulating case of such portable devices.

Abstract: A system and method for measuring phase variations in signals are disclosed. The system and method may be integrated inside a circuit pack in the form of a built-in-self-test (BIST) unit. The BIST provides predetermined periodic attenuation to an input signal and determines phase variation in output signal due to applied attenuations by measuring sideband power of the output signal.

Abstract: A portable millimeter-wave wireless communications device relies on millimeter-wave spectrum for wireless communications. The millimeter-wave device may be a smart-phone, a laptop computer or a tablet computer. The millimeter-wave device may be a module that is added to an existing portable device such as a smart-phone, a laptop computer or a tablet computer to provide millimeter-wave communications capability. The module may be incorporated into a protective encapsulating case of such portable devices.

Abstract: A system and method for measuring phase variations in signals are disclosed. The system and method may be integrated inside a circuit pack in the form of a built-in-self-test (BIST) unit.

Abstract: A digital to analog converter (DAC) includes a quantity of N cells including a Least Significant Bit (LSB) cell, a Most Significant Bit (MSB) cell and, N?2 cells ordered therebetween. Each of the N cells is configured to carry a current of I, 2*I, 4*I, 8*I, . . . , 2^(N?1)*I, respectively. At least the LSB cell includes a first cell element and a second cell element driven by a first current input and a second current input, respectively. A difference between a magnitude of the first current input and a magnitude of the second input current is approximately equal to I.

Abstract: A mixed-signal integrator, having an analog input and a digital output, is adapted to perform an integration operation partially in the analog domain and partially in the digital domain while eliminating the limitations of a conventional analog integrator. The integrator also digitizes a signal of interest without the use of a conventional sampling operation followed by a conventional analog-to-digital converter. The analog integrator portion generates an analog integration signal limited between low and high rail voltages defined by two comparators with corresponding threshold voltages. When either rail voltage is reached, the polarity of the input signal is reversed to prevent the integration result from exceeding that rail. Each such event is also tracked in digital logic, which provides a count whenever two consecutive such events correspond to the two different rails. At the end of the integration duration this count serves as the digital representation of the integration result.