50 results about "Nonlinear channel" patented technology

A method for processing a signal propagated through a nonlinear channel is disclosed. The method comprises modeling the channel characteristics to produce a linearized channel model, wherein the linearized channel model has a linearized transfer function that includes a plurality of first order polynomials and nonlinear operators. The method further comprises deriving an inverse linearized channel model from the linearized channel model and filtering the signal using the inverse linearized channel model.

A contact tip for a welding torch is provided. In one embodiment, the contact tip includes a body formed of an electrically conductive material and a non-linear passage that extends through the body. The non-linear passage of this embodiment is configured to receive a wire electrode and to facilitate electrical communication between the body and the wire electrode. Various contact tip assemblies and manufacturing techniques for forming contact tips are also provided.

A method for identifying and modeling nonlinearities in communications channels, particularly optical communication channels. A channel in general is modeled as a summation of linear and non linear terms having memory. The terms are functions of the input to the channel with respect to time, such as a sequence of input bits to the channel. In one embodiment the most recent input bits are used to access a value in a look up table. The value accessed is compared to an actual value received from the channel. The difference between the value in the table and the actual channel value may be used to correct the value in the table. When the look up table and the channel converge the look up table contains a model of the channel with memory that can model nonlinearities. A nonlinear channel having memory may also be modeled in terms of Volterra Kernels.

A communications system (10) which utilizes an M-ary QAM signal constellation suitable for non-linear applications. The communications system includes a modulator (18) for utilizing the M-ary constellation to implement the modulation. The M-ary constellation is a circular constellation which provides a simplified amplitude predistortion by utilizing the subject M-ary constellations, enabling more efficient communications can then be achieved through a peak-power-limited non-linear channel (16). Such non-linear channels (16) are more power efficient at creating RF energy from DC energy.

An apparatus for cancelling a self-interference signal between a transmission antenna and a reception antenna is disclosed. The apparatus includes a first self-interference signal cancellation unit for cancelling a self-interference signal in consideration of a linear channel between the transmission antenna and the reception antenna, a second self-interference signal cancellation unit for cancelling a self-interference signal in consideration of nonlinear channel characteristic between the transmission antenna and the reception antenna or linear characteristic of a radio channel, and a controller for comparing a transmitted signal output from the transmission antenna and a received signal received by the reception antenna to provide a first coefficient to be applied to self-interference signal cancellation of a linear device in the first self-interference signal cancellation unit and a second coefficient to be applied to self-interference signal cancellation of a nonlinear device in the second self-interference signal cancellation unit.

The invention discloses a digital pre-distortion processing system with sample rate conversion and a method thereof. The system comprises: a power-amplifier anti-model solution module and a digital pre-distortion module. The power-amplifier anti-model solution module and the digital pre-distortion module both comprise a sample rate conversion apparatus. The sample rate conversion apparatus is used to convert a sequence with 1 times sample rate into the sequence with the multiple times sample rate and extract the sequence with the 1 times sample rate from the sequence with the multiple times sample rate. According to the invention, a spectrum aliasing phenomenon can be eliminated through a sample rate conversion method. A pre-distortion effect of transmitting a broadband or multiband signal through a non-linear channel can be effectively improved.

The present disclosure relates to devices and methods for creating channels within bone. One method for treating bone generally includes traversing an elongated member through cancellous bone of a vertebral body along a first generally non-linear path and then retracting the elongated member, thereby leaving a generally non-linear channel. The elongated member then is traversed through the cancellous bone along a second generally non-linear path, which second path does not completely coincide with the first path and then retracted along the second generally nonlinear path, thereby leaving a second generally non-linear channel. Optionally, bone filler material is deployed into the channels.

The present invention is suitable for communication field, and provides a digital repeater, a self-excitation counteracting method and a device thereof, wherein the device comprises the following components: a digital baseband signal collecting unit which is used for collecting and combining a first digital baseband signal and a second digital baseband signal to obtain an exercise reference digital baseband signal; an estimator which executes the nonlinear model estimation of transceiver coupling channel according to the exercise reference digital baseband signal to obtain each parameter of a nonlinear filter; the nonlinear filter which is used for executing self-adapting real-time operation to the input first digital baseband signal according to each obtained nonlinear filter parameter to obtain a baseband counteracting signal which reflects the nonlinear channel characteristic of the transceiver feedback channel; and a self-excitation counteracting unit which is used for executing signal counteracting according to the first baseband signal and the baseband counteracting signal. The method and device according to the invention estimate the nonlinear characteristic in the transceiver feedback channel thereby effectively reducing the effect of interfering signal and obtaining a better self-excitation counteracting effect.

Described is an all-optical switch that is significantly insensitive to polarization instabilities. The optical switch can be configured as an ultrafast logic gate, a switch for ultrafast communication systems or a key component of an all-optical regenerator. Performance is independent of the statistical characteristics of the data controlling the switch. The switch includes a birefringent optical channel in communication with one end of a nonlinear optical channel through a coupler and a polarization rotation mirror in communication with the other end of the nonlinear channel. An optical data pulse for controlling the switching function is provided to one port of the coupler.

A steering lock assembly an assembly housing includes a non-linear passage that receives a cam shaft and/or cam pin. The non-linear passage provides a steering lock assembly that is shorter than steering lock assemblies having an assembly housing with a linear passage for receiving the cam shaft and cam pin.

An apparatus for treating air from an exhaust port of a building. The apparatus includes an enclosed pathway having an inlet for communication with an exhaust port, a discharge outlet, and a non-linear pathway portion between the inlet and discharge outlet. The non-linear pathway includes air treatment material positioned in communication with a portion of the pathway to expose the air to the air treatment material as it moves through the pathway. The apparatus includes an irrigation system for maintaining the moisture content of the air treatment material.

Gear pumps are disclosed having a gear-assembly section, a drive-assembly section, and at least one passage fluidly connecting the gear-assembly and drive-assembly sections, wherein the passage includes substantially non-movable walls defining a non-linear fluid-flow path. A particular example is a magnetic gear pump having a gear-assembly section; a section that includes a magnet assembly received in a cup cavity; and a third section located between the gear-assembly and magnet-assembly sections, wherein the third section includes a fluid-input port, a fluid-output port, and at least one conduit for fluidly interconnecting the gear-assembly and magnet-assembly sections; and a member defining at least one non-linear passage in fluid connection with the third section conduit and the cup cavity.

The present invention is a machine or method used in digital communications. Symbols are selected in periodic fashion from at least two different symbol constellations. At least one of the symbol constellations has a non-conjugated second moment not equal to zero. The non-conjugated second moment is a second-order statistic. Symbol selection leads to second-order input statistics having cyclostationary phase, and thus to second-order output statistics having cyclostationary phase. These statistics can be used for low-complexity identification and equalization of both linear and nonlinear channels. The invention allows for low-complexity identification and equalization of linear channels and of nonlinear channels without requiring constant-modulus constellations.

A signal transmission apparatus and multicarrier communication system that includes: a first receiving unit configured to receive a probe signal transmitted by transmitting end; wherein, the signal is generated according to characteristics of recommended signal configuration obtained by previous signal to noise ratio (SNR) probings; a first processing unit configured to probe a channel SNR according to the signal; a first determining unit configured to determine transmission signal configuration and signal transmission performance according to a final channel SNR obtained by multiple times of SNR probing; and a first transmitting unit configured to transmit the configuration and the performance to the transmitting end, so that the transmitting end transmits an actual transmission signal according to the configuration and the performance. With the embodiments, accuracy of probing a nonlinear channel SNR is improved, and reliability and stability of the communication system are guaranteed.

A pump assembly is configured to fit to a predefined pipe layout defined by supply and discharge interfaces that are positioned in a predefined relation to supply and discharged centerlines, respectively. The pump assembly includes a multistage pump having a plurality of pumping stages mounted along a pump shaft rotating along a rotation axis. The multistage pump has an inlet port and a discharge port, and the multistage pump is aligned horizontally such that the rotation axis is oriented parallel to the supply centerline. The pump assembly also includes an adaptor having a pump interface and a pipe interface, wherein the adaptor has an internal fluid channel extending along a non-linear passageway between the pump and pipe interfaces. The pump interface is coupled to one of the inlet and discharge ports of the multistage pump, and the pipe interface is located proximate one of the supply and discharge interfaces.

Lighting device (1) for a vehicle including a cup-shaped housing body (2) and at least one cooled lighting module (5) arranged within the housing body facing a front inlet opening (3) thereof closed by a transparent cover or lens (4); wherein each cooled lighting module includes at least one light source (6), a radiator element (7) operatively associated to the at least one light source to removethe heat generated in use thereby and a diverter screen element (10) assembled directly onto the radiator element, rigid therewith and spaced apart therefrom, delimiting with the radiator element andwithin the housing body a non-linear channel (12) arranged at the rear of the light source and having a first open end (14) facing a fan (16) operatively associated with the radiator element (7) and asecond open end (15) facing the transparent cover or lens (4).