Multi-branch down converting fractional rate change filter

A method of filtering an input sample stream having a downsampling rate is disclosed to generate an output sample stream having an upsampling rate that is less than the downsampling rate. The input sample stream is input to a rate change filter having multiple filter branches. The input sample stream is filtered at each of the multiple filter branches to output filtered sample substreams. Each of the multiple filter branches have filter coefficients corresponding to a different phase of the filter response. The filtered sample substreams are stored in a memory and the stored filtered sample substreams are combined to generate the output sample stream.

Connection integrity monitor for digital selection circuits

A circuit connection integrity monitor detecting and isolating connection faults in data path cards is disclosed. A connection integrity monitoring method and corresponding apparatus are applicable to selector and cross-connect circuits and permit a user to monitor all points where signal traffic may be prone to misconnection.

Multiplexing SONET /SDH data streams using independent encoding schemes

A system for transparently transporting m synchronous data streams as an aggregate data stream on a single channel of a Wave Division Multiplexed (WDM) optical link without pointer processing uses m unique encoding schemes to enable recovery of the respective m data streams from the aggregate data stream. The encoding schemes are preferably self-inverting. The respective m data streams are parsed into data units and encoded. The data units are then interleaved to form the aggregate data stream. Recovery is accomplished using a reverse process.

Measurement of Voltage Standing Wave Ratio of Antenna System

The present invention provides methods and apparatus to detect the presence of interferers in a wideband digital VSWR measurement signal. Interferers cause power differences over different intervals of time and frequency, and may be detected by comparing the measured signals in both time and frequency domains with the original signal. Frequency components in the measured signals may be discarded if the interference is deemed too large. The remaining frequency components can then be used to compute the VSWR. 1. A method implemented in a wireless transmitter of calculating a voltage standing signal ratio (VSWR) , said method comprising:converting time-domain measurement signals for a forward signal and a reflected signal to a frequency domain;computing reflection coefficients for a plurality of frequency bins based on said measurement signals;computing interference detection metrics for one or more of said frequency bins as a function of the reflection coefficients;discarding reflection coefficients for one or more frequency bins based on the interference detection metrics; andcomputing the VSWR based on the reflection coefficients for the remaining frequency bins.2. The method of wherein converting time-domain measurement signals for a forward signal and reflected signal to a frequency domain comprises computing discrete Fourier transforms of the measurement signals for the forward signal and the reflected signal.3. The method of wherein computing reflection coefficients for a plurality of frequency bins based on said reflection coefficients comprises dividing a magnitude of the measurement signal for the reflected signal by a corresponding magnitude of the measurement signal for the forward signal.4. The method of wherein discarding reflection coefficients for one or more frequency bins comprises:comparing the interference detection metrics for one or more frequency bins to a detection threshold; anddiscarding frequency bins where the interference detection metrics ...

Measurement of Voltage Standing Wave Ratio of Antenna System

The present invention provides methods and apparatus to detect the presence of interferers in a wideband digital VSWR measurement signal. Interferers cause power differences over different intervals of time and frequency, and may be detected by comparing the measured signals in both time and frequency domains with the original signal. Frequency components in the measured signals may be discarded if the interference is deemed too large. The remaining frequency components can then be used to compute the VSWR. 1. A measurement circuit for measuring a voltage standing wave ratio (VSWR) in an antenna system , the measurement circuit comprising:a directional coupler connected between a transmitter and an antenna;a receiver circuit to generate measurement signals for forward and reflected signals in a transmission line of the antenna system; and compute reflection coefficients for a plurality of frequency bins based on the measurement signals;', 'detect interference in one or more of the frequency bins based on the reflection coefficients;', 'discard reflection coefficients for one or more frequency bins in which interference has been detected; and', 'compute the VSWR of the antenna system based on the reflection coefficients for the remaining frequency bins., 'a processing circuit configured to2. The measurement circuit of claim 1 , wherein the processing circuit is configured to control claim 1 , based on the computed VSWR claim 1 , transmission of a signal on the transmission line.3. The measurement circuit of claim 2 , wherein the processing circuit is configured to control by sending a control signal to refrain from transmitting the transmission signal on the transmission line.4. The measurement circuit of claim 1 , wherein the processing circuit is configured to detect a transmission line or antenna fault based on the computed VSWR claim 1 , and send a control signal for the antenna system responsive to the detection.5. The measurement circuit of claim 1 , wherein: ...

Multi-branch down converting fractional rate change filter

A method of filtering an input sample stream having a downsampling rate is disclosed to generate an output sample stream having an upsampling rate that is less than the downsampling rate. The input sample stream is input to a rate change filter having multiple filter branches. The input sample stream is filtered at each of the multiple filter branches to output filtered sample substreams. Each of the multiple filter branches have filter coefficients corresponding to a different phase of the filter response. The filtered sample substreams are stored in a memory and the stored filtered sample substreams are combined to generate the output sample stream.

IN-PHASE AND QUADRATURE (I/Q) ENCODING FOR VARIABLE DATA RATES

According to one or more embodiments, a network node for communicating with at least one radio unit is provided. The network node including processing circuitry configured to: determine at least one code frame characteristic of a non-linear grid, map in-phase and quadrature, I/Q, data to non-linear grid having a plurality of regions that correspond to a plurality of code words where a plurality of bit sizes of the plurality of code words is a function of a radial distance from an origin of the non-linear grid, select a subset of the plurality of code words based at least in part on a target data rate for transmission, and cause transmission of the I/Q data based at least in part on the selected subset of the plurality of code words. 1. A network node for communicating with at least one radio unit , the network node comprising processing circuitry configured to:determine at least one code frame characteristic of a non-linear grid;map in-phase and quadrature, I/Q, data to non-linear grid having a plurality of regions that correspond to a plurality of code words, a plurality of bit sizes of the plurality of code words is a function of a radial distance from an origin of the non-linear grid;select a subset of the plurality of code words based at least in part on a target data rate for transmission; andcause transmission of the I/Q data based at least in part on the selected subset of the plurality of code words.2. The network node of claim 1 , wherein the plurality of code words are mapped to the plurality of regions based at least in part on a probability of use for communication.3. The network node of claim 1 , wherein the bit size of at least one of the plurality of code words corresponds to a probability for use for communication.4. The network node of claim 1 , wherein the plurality of regions are a plurality of at least semi-polygonal regions.5. The network node of claim 1 , wherein the selection of the plurality of code words begins at a center portion of the non ...

Measurement of voltage standing wave ratio of antenna system

The present invention provides methods and apparatus to detect the presence of interferers in a wideband digital VSWR measurement signal. Interferers cause power differences over different intervals of time and frequency, and may be detected by comparing the measured signals in both time and frequency domains with the original signal. Frequency components in the measured signals may be discarded if the interference is deemed too large. The remaining frequency components can then be used to compute the VSWR.

Multiplexing SONET /SDH data streams using independent encoding schemes

A system for transparently transporting m synchronous data streams as an aggregate data stream on a single channel of a Wave Division Multiplexed (WDM) optical link without pointer processing uses m unique encoding schemes to enable recovery of the respective m data streams from the aggregate data stream. The encoding schemes are preferably self-inverting. The respective m data streams are parsed into data units and encoded. The data units are then interleaved to form the aggregate data stream. Recovery is accomplished using a reverse process.

Connection integrity monitor for digital selection circuits

Measurement of voltage standing wave ratio of antenna system

The present invention provides methods and apparatus to detect the presence of interferers in a wideband digital VSWR measurement signal. Interferers cause power differences over different intervals of time and frequency, and may be detected by comparing the measured signals in both time and frequency domains with the original signal. Frequency components in the measured signals may be discarded if the interference is deemed too large. The remaining frequency components can then be used to compute the VSWR.