A method may comprise receiving and sampling a signal. The signal may encode a data packet. A slice may be generated and stored comprising a pair of values for each of a selected number of samples of the signal representing a correlation of the signal to reference functions in the receiver. The presence of the data packet may then be detected and the detected packet decoded from the stored slices. The generating and storing slices may be carried out as the received signal is sampled. The sampled values of the signal may be discarded as the slices are generated and stored. The slice representation of the signal can be manipulated to generate filters with flexible bandwidth and center frequency.

A cellular radio architecture for a vehicle that includes a receiver module having a receiver delta-sigma modulator that converts analog receive signals to a representative digital signal. The architecture further includes a transmitter module having a transmitter delta-sigma modulator for converting digital data bits to analog transmit signals. Portions of the receiver and transmitter modules are fabricated with indium phosphide (InP) technologies and portions of the receiver and transmitter modules are fabricated with CMOS technologies.

A local oscillator outputs a local oscillator signal that provides an upper side heterodyne mode or a lower side heterodyne mode for a received RF signal. A first converter converts the received RF signal into an IF signal, based on the local oscillator signal output from the local oscillator. An FM detector subjects the IF signal produced by conversion to detection. A first measurement unit measures a signal intensity of the IF signal before the IF signal is input to the FM detector. A second measurement unit measures a squelch voltage of a signal detected by the FM detector. A controller that controls the local oscillator based on the signal intensity measured by the first measurement unit and the squelch voltage measured by the second measurement unit.

A method and terminal device for executing a radio application is disclosed. The method for executing a radio application is a method for executing a radio application independent of a modem in a terminal device, comprising the steps of: communicating with each other using a reconfigurable radio frequency interface (RRFI) by a unified radio application (URA), which operates on a radio computer of the terminal device, and a radio frequency (RF) transceiver, which operates in a radio platform on the radio computer; and supporting, by the RRFI, at least one service among a spectrum control service, a power control service, an antenna management service, a transmission/reception chain control service, and a radio virtual machine protection service.

Analysis channelizers are provided. In one embodiment, the channelizer includes an M-path filter receiving an input signal; a circular buffer in communication with the M-path filter; and an M-point inverse fast Fourier transform (IFFT) circuit in communication with the circular buffer, such that the channelizer aligns spectra of the input signal with spectral responses an odd length, non-maximally decimated filter bank by alternating sign heterodyne of the input signal. The channelizer applies an equivalency theorem to the non-maximally decimated filter bank formed by an odd length polyphaser filter. Advantageously, the M-path filter does not require on-line signal processing to obtain odd-indexed filter centers. In another embodiment, the channelizer alternates a sign heterodyne of a filter coefficient weight.

An integrated circuit comprises an input, a digital step attenuator, an analog-to-digital converter, a first output, a second output, a first bandwidth filter, a first band attack detector, a first band decay detector, a second bandwidth filter, a second band attack detector, a second band decay detector, and an automatic gain control. The ADC is configured to output a digital signal including a first and a second frequency range. The first and second bandwidth filters are configured to extract respective digital signals comprising the first and second frequency ranges. The band attack and decay detectors are configured to detect band peaks or decays thereof such that the DSA and External AMP may be controlled by means of the AGC based on the detected band peaks or decays, and ADC attack and ADC decay.

The disclosed embodiments provide an absorptive coupled-line bandpass filter. This bandpass filter includes a first port, which is coupled to a first absorptive stub, and a second port, which is coupled to a second absorptive stub. The bandpass filter also includes a coupled-line bandpass section coupled between the first and second ports, wherein the coupled-line bandpass section comprises a set of one or more parallel strip line resonators, which are coupled together in series and are coupled to the first and second ports through overlapping coupled-line sections, wherein at a center frequency of a passband for the absorptive coupled-line bandpass filter, the first and second absorptive stubs appear as open circuits, and outside of the passband, the first and second absorptive stubs appear as matched loads to ground and contribute to absorption of out-of-band signals.

A high frequency (HF) radio configured to process an incoming call from another HF radio, the HF radio comprising: an adjustable-bandwidth tunable bandpass filter configured to provide HF signals that are within an adjustable-bandwidth Staring Frequency Band (SFB), being a subset of a HF band, the HF signals including analog calling signals that are indicative of incoming calls; a receive path configured to convert the analog calling signals to digital calling signals; a plurality of receivers configured to monitor assigned Automatic Link Establishment (ALE) channels within the SFB for the digital calling signals; and a controller configured to: establish a communication link between the HF radio and the another HF radio, in response to a given receiver of the receivers decoding a digital calling signal that is indicative of the incoming call; and select the SFB and the assigned ALE channels, based on an indication of ionospheric propagation conditions.

Described herein are systems configured for carrier aggregation. Systems include a multiplexing circuit having a filter assembly, switching circuit with a switching path, and a switchable impedance. The filters can be designed so that when operated simultaneously (e.g., during multi-band operation) the same inductance can be used allowing the switching network to switch in a particular inductance into the path. The described systems can include an inductance that is coupled to an output port so that when operating in single-band mode, the different paths share the same inductance. Relative to other solutions, the described systems can improve performance (e.g., reduce insertion loss), reduce the number of components in the associated module, reduce manufacturing costs, and the like.

A radio-frequency (RF) sampling transmitter (e.g., of the type that may be used in 5G wireless base stations) includes a complex baseband digital-to-analog converter (DAC) response compensator that operates on a complex baseband signal at a sampling rate lower than the sampling rate of an RF sampling DAC in the RF sampling transmitter. The DAC response compensator flattens the sample-and-hold response of the RF sampling DAC only in the passband of interest, addressing the problem of a sin c response introduced by the sample-and-hold operation of the RF sampling DAC and avoiding the architectural complexity and high power consumption of an inverse sin c filter that operates on the signal at a point in the signal chain after it has already been up-converted to an RF passband.