A radio frequency module and a communication device capable of reducing a mounting substrate size. The radio frequency module includes a mounting substrate, a first filter, and a second filter. The mounting substrate has a first main surface and a second main surface that are on opposite sides of the mounting substrate. The first filter is provided on the first main surface and allows a first receiving signal in a first frequency band to pass through. The second filter is stacked on the first filter and allows a second receiving signal in a second frequency band different from the first frequency band to pass through.

On-chip Multi-band equalizers for adjusting signal strength for a receiver receiving multi-band frequency signals are provided, The multi-band equalizer comprises multiple series connected tapped LC resonators. The tapped LC resonator may be capacitive tapping or inductive tapping, where both frequency and gain of the frequency bands of interest may be programmed by tuning the capacitances of the programmable capacitors and/or selecting the tapped out terminals of the inductors. The multi-band equalizer may be connected to a signal node, for instance between two amplifiers in the receiver.

Disclosed herein is an innovative multi-layer hybrid/digital MIMO architecture that comprises single-stream or fully-connected (FC) multi-stream beamforming tiles (with RF complex-weights) in the first layer, followed by a fully connected (analog/digital) baseband layer. This architecture overcomes the complexity versus spectral-efficiency tradeoffs of existing hybrid MIMO architectures and enables MIMO stream/user scalability, superior energy-efficiency, and spatial-processing flexibility.

Disclosed herein is an innovative multi-layer hybrid/digital MIMO architecture that comprises single-stream or fully-connected (FC) multi-stream beamforming tiles (with RF complex-weights) in the first layer, followed by a fully connected (analog/digital) baseband layer. This architecture overcomes the complexity versus spectral-efficiency tradeoffs of existing hybrid MIMO architectures and enables MIMO stream/user scalability, superior energy-efficiency, and spatial-processing flexibility.

A PAM-N receiver capable of adaptively adjusting threshold voltages determining a level of a received signal and a method of adaptively adjusting threshold voltages thereof are disclosed. According to the method of the present invention, the result of comparison between reference data levels and the level of data in the received signal are used to adjust the reference data levels, and the threshold voltages of a PAM-N receiver are adaptively calculated from the adjusted reference data levels, thereby reflecting transmission line conditions and Inter-Symbol Interference.

A network communication device includes a first output port, a second output port, and a converting circuit. The first output port may be in communication with an input port and may be configured to receive a first reduced-power version of the signal received at an input port. The converting circuit may be configured to receive a second reduced-power version of the signal, down-convert a high-frequency portion thereof, and produce a down-converted signal. The first and the second reduced-power versions of the signals are in the same frequency band. The second output port receives at least a portion of the down-converted signal such that the high frequency portion of the second reduced power version of the signal is attenuated before the signal is transmitted to a subscriber device.

A radio frequency (RF) receiver includes a transceiver, a programmable logic device (PLD), and a digitally tunable high-pass and low-pass filter bank. The transceiver is configured to receive a mission data file (MDF) specifying a plurality of RF frequencies to be tuned by the receiver and to convert the MDF into a binary file. The PLD is configured to receive the binary file from the transceiver and, based on the binary file, to transmit one or more commands that cause the filter bank to enter a selected one of a plurality of predefined filter states corresponding to one or more of the RF frequencies. In operation, the receiver receives an input signal and the filter bank dynamically filters the input signal in response to the one or more commands from the PLD.

An oscillation circuit includes a first oscillation circuit that includes: a first diode that has a first negative differential resistance; a first composite inductor in which a first inductor and a second inductor are connected in series, is connected to the first diode in series; a second diode that has a second negative differential resistance and is connected to the first inductor in parallel; and a third diode that has a third negative differential resistance, is connected to the first diode in series, and is connected to the first composite inductor in parallel, wherein a burst pulse is output from a common connection point of the first inductor, the second inductor, and the second diode.

An oscillation circuit includes a first oscillation circuit that includes: a first diode that has a first negative differential resistance; a first composite inductor in which a first inductor and a second inductor are connected in series, is connected to the first diode in series; a second diode that has a second negative differential resistance and is connected to the first inductor in parallel; and a third diode that has a third negative differential resistance, is connected to the first diode in series, and is connected to the first composite inductor in parallel, wherein a burst pulse is output from a common connection point of the first inductor, the second inductor, and the second diode.

Systems, methods and computer software are disclosed for fronthaul. In one embodiment a method is disclosed, comprising: providing a virtual Radio Access Network (vRAN) having a centralized unit (CU) and a distributed unit (DU); and interconnecting the CU and DU over an Input/Output (I/O) bus using Peripheral Component Interconnect-Express (PCIe); wherein the CU and the DU include a PCI to optical converter and an optical to PCI converter.