Systems and methods for signal path isolation for neutral-host hardware are provided. In one embodiment, an isolation circuit for a multiple-subchannel wireless communication transceiver comprises: a Tx path coupled to a transmit path output of a multiple-subchannel transceiver; a Rx path coupled to a receive path input of the transceiver; a precancellation circuit comprising: an isolation adjustment circuit within the transmit path of the isolation circuit, the isolation adjustment circuit comprising a phase shifter and a reflection tuner; a directional coupler within the Rx path of the isolation circuit. The isolation adjustment circuit outputs a reflected wave signal comprising a cancellation reference signal to the directional coupler. The cancellation reference signal comprises a complex conjugate of a TX signal leakage signal component of a signal transported in the Rx path of the isolation circuit. Within the directional coupler the cancellation reference signal destructively interferes with TX signal leakage signal component.

A system for interference mitigation including a transmit coupler that samples the RF transmit signal to create a sampled RF transmit signal; a transmit analog canceller that transforms the RF transmit signal to an RF interference cancellation signal, according to a first configuration state; a first receive coupler that combines the RF interference cancellation signal and the RF receive signal to generate a composite RF receive signal; a sampling analog interference filtering system that, in order to remove interference in the transmit band, filters the sampled RF transmit signal to generate a cleaned transmit signal; a first frequency downconverter that converts the transmit signal to a BB transmit signal; a second frequency downconverter that converts the composite RF receive signal to a composite BB receive signal; and an analog-to-digital converter that converts the transmit signal to a digital transmit signal.

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.

Frequency ranges may be converted by an apparatus including a converter configured to shift an original frequency range of an input data signal to a target frequency range, an input band selective filter bank configured to route the input data signal through a bandpass filter of a selected subrange within the target frequency range, the input selective filter bank including a plurality of bandpass filters, each bandpass filter having a corresponding subrange within the target frequency range.

Disclosed are a local oscillator control method and system, a signal transceiving method, a terminal device, a non-transitory computer-readable storage medium and an electronic device. The local oscillator control method may include: in response to an operating resource of a scene being received and the operating resource containing a millimeter wave resource, extracting, from the operating resource, an operating frequency band in the scene; evaluating whether interference presents between the operating frequency band and a default frequency point of a millimeter wave intermediate-frequency signal; and in response to a presence of interference, acquiring a new frequency point of a local oscillator signal matched with an interference-free frequency point of an intermediate-frequency signal, and adjusting the frequency point of the local oscillator signal from a default frequency point of the local oscillator signal to the new frequency point.

A radio frequency module includes a filter that is arranged on a first path connecting a common terminal and a first input/output terminal and has a first frequency band as a pass band, another filter that is arranged on a second path connecting the common terminal and a second input/output terminal and has a second frequency band different from the first frequency band as a pass band, and a detection circuit connected to the first path and configured to detect a leakage signal in the second frequency band leaked to the first path and output a signal indicating a detection result.

A system that incorporates aspects of the subject disclosure may perform operations including, for example, obtaining uplink information associated with a downlink path, wherein the uplink information includes operational parameters used by a plurality of communication devices for transmitting wireless signals on a plurality of uplink paths; performing, based on the uplink information, a plurality of measurements of the plurality of uplink paths; identifying a measurement from the plurality of measurements that is below a threshold, thereby indicating an affected uplink path of the plurality of uplink paths; initiating a first filtering of the affected uplink path, wherein the initiating is based on the identifying and wherein the first filtering is based upon one or more first filtering parameters; and receiving instructions comprising one or more updated filtering parameters, wherein the instructions are received by the system at a port of the system. Other embodiments are disclosed.

This frequency tripler system uses a cascade of integrated transistor circuit differential limiting amplifiers and tunable notch filters that can directly serve one or more outputs, such as a direct clock or local oscillator drive. With this topology, filtering is distributed between two or more stages of differential limiting amplifiers and tunable notch filters. This enables suppression of smaller fundamental tone by the differential limiting amplifiers along with the tunable notch filters and yields a strong third harmonic signal to directly drive high performance mixers and digital-to-analog converters.

A wireless communication system, in some embodiments, comprises: a receiver; one or more tunable elements, coupled to the receiver, to adjust an impedance of the system; and a processor, coupled to the one or more tunable elements, to tune said one or more tunable elements based on the strength of a received signal.

A system for linearized-mixer interference mitigation includes first and second linearized frequency downconverters; a sampling analog interference filtering system that, in order to remove interference in the transmit band, filters the sampled BB transmit signal to generate a cleaned BB transmit signal; an analog interference canceller that transforms the cleaned BB transmit signal to a BB interference cancellation signal; and a first signal coupler that combines the BB interference cancellation signal and the BB receive signal in order to remove a first portion of receive-band interference.