A serial signal detector and a differential signal detection method are provided. The serial signal detector includes a voltage comparison module and a hybrid logic filter. The voltage comparison module receives a differential signal, including a first shifted signal and a second shifted signal. The voltage comparison module includes a first comparator and a second comparator. Based on the first shifted signal, the second shifted signal, and a voltage threshold, the first and the second comparators respectively generate a first and a second comparison signals. The hybrid logic filter includes a controllable logic gate and a capacitor. The controllable logic gate performs a logic operation related to the first and the second comparison signals and generates a filtered and converted pulse accordingly. The controllable logic gate and the capacitor jointly perform a preliminary filtering operation to the filtered and converted pulse while the logic operation is being performed.

Communication terminals configured for satellite and terrestrial communications and methods of use are disclosed herein. In an embodiment, a communication terminal includes an antenna, a filter and filter control circuitry. The antenna is configured to receive a radio signal. The filter is configured to filter the radio signal to remove an interference signal. The filter control circuitry is configured to detect the interference signal present in the radio signal received by the antenna and cause an adjustment to the filter to block the interference signal. In another embodiment, the communication terminal includes an amplifier and gain control circuitry. The amplifier is configured to configured to amplify the radio signal. The gain control circuitry is configured to detect an interference signal present in the radio signal received by the antenna and cause an adjustment to the amplifier based on the detected interference signal.

Example access network devices are described. One example access network device includes a signal processing apparatus. The signal processing apparatus includes a first power amplifier, a second power amplifier, a first filter, a second filter, and a combiner. The first filter filters a second signal obtained by the first power amplifier, to obtain a first sub-signal belonging to a first frequency band and a second sub-signal belonging to a second frequency band. The second filter filters a fourth signal obtained by the second power amplifier, to obtain n sub-signals including at least a third sub-signal belonging to a third frequency band. The combiner combines the first sub-signal and i sub-signals in the n sub-signals based on a preset condition, to obtain a first combined signal. The communication module sends the first combined signal by using a first port, and sends the second sub-signal by using a second port.

A PA module includes: a multilayer substrate having a ground pattern layer connected to a ground of a power source; amplifier transistors disposed on the multilayer substrate; a bypass capacitor having one end connected to the collector of the amplifier transistor; a first wiring line connecting the emitter of the amplifier transistor and the ground pattern layer to each other; a second wiring line connecting the emitter of the amplifier transistor and the ground pattern layer to each other; a third wiring line connecting the other end of the bypass capacitor and the ground pattern layer to each other; and a fourth wiring line formed between the amplifier transistor and the ground pattern layer and between the bypass capacitor and the ground pattern layer and connecting the first wiring line and the third wiring line to each other.

A radio frequency module includes: a module substrate having a main surface; a conductive member to partition the main surface into regions in a plan view of the main surface, and being set to ground electric potential; a switch disposed in one of the regions and connected to an antenna connection terminal; a power amplifier disposed in one of the regions and connected to the antenna connection terminal via the switch; and a low-noise amplifier disposed in one of the regions and connected to the antenna connection terminal via the switch.

This invention presents a method and apparatuses for wireless networking comprising one or more BS with N.sub.bs antennas; two or more SCs in the range of a BS where a SC has N.sub.sc antennas, uses N.sub.sc1≦N.sub.sc antennas for communication with a BS and uses N.sub.sc2≦N.sub.sc antennas for communication with one or more UEs; at the same time a BS transmitting DL signals to K SCs using multi-user transmit BF in a frequency channel, a SC simultaneously transmitting DL signals to one or more UEs in its range using the same frequency channel; and, at the same time a BS receiving UL signals from K SCs using multi-user receive BF in a frequency channel, a SC simultaneously receiving UL signals from one or more UEs in its range using the same frequency channel. Furthermore, beamforming using antennas on the SCs is performed to reduce the inter-SC interferences.

RF front-end circuitry, which includes a first RF low noise amplifier (LNA) and a first reconfigurable RF filter, is disclosed. The RF front-end circuitry operates in one of a group of operating modes. The first reconfigurable RF filter, which has a first reconfigurable RF filter path, includes a first receive (RX) shunt switching element coupled between the first reconfigurable RF filter path and ground. The first reconfigurable RF filter path is coupled to an input of the first RF LNA. The group of operating modes includes a first operating mode and a second operating mode. During the first operating mode, the first RX shunt switching element is ON. During the second operating mode, the first RX shunt switching element is OFF and the first RF LNA receives and amplifies a first filtered RF receive signal from the first reconfigurable RF filter to provide a first receive signal.

A low noise block down converter for receiving satellite broadcasting comprises an input terminal; a low noise amplifying unit including one or more low noise amplifiers configured to amplify a signal received from the input terminal, and a built-in cavity waveguide band pass filter configured to pass a frequency band being higher or lower than a frequency band of a predetermined terrestrial transmission signal among satellite broadcasting frequency bands of signals amplified by the one or more low noise amplifiers; and a mixer configured to convert the signal output from the low noise amplifying unit into an intermediate frequency signal by mixing the signal output from the low noise amplifying unit with a local oscillation signal.

Provided is an OFDM reception apparatus that can reduce, even in an environment where the influence of noises is strong, this influence of the noises, thereby improving the precision of detecting a carrier frequency error. In this apparatus, a filtering unit (151) receives received signals each including a short preamble (STF) in which a plurality of pilot subcarriers are intermittently arranged in the frequency domain and repeatedly arranged in the time domain, and the filtering unit (151) attenuates the frequency components between respective two adjacent ones of the plurality of pilot subcarriers in the frequency domain. A correction unit (154) corrects a carrier frequency error of the received signal on the basis of the signals of the plurality of pilot subcarriers having passed through the filtering unit (151).

RF filtering circuitry includes a first transmit signal node, a second transmit signal node, a common node, first transmit signal filtering circuitry, second transmit signal filtering circuitry, and transmit signal cancellation circuitry. The first transmit signal filtering circuitry is coupled between the first transmit signal node and the common node and is configured to pass RF transmit signals within a first transmit signal frequency band while attenuating signals outside the first transmit signal frequency band. The second transmit signal filtering circuitry is coupled between the second transmit signal node and the common node and is configured to pass RF transmit signals within a second transmit signal frequency band while attenuating signals outside the second transmit signal frequency band. The transmit signal cancellation circuitry is coupled between the common node and the second transmit signal node and is configured to generate a transmit cancellation signal.