Abstract: Disclosed is a method and an apparatus for handling signals in an OFDM-based communication network (100) received at a receiver (120). The method comprises obtaining a signal in time domain, the signal comprising a payload signal sent from a transmitter (110) towards the receiver (120) as well as an interference signal, the payload signal residing in a first frequency band and the interference signal residing in a second frequency band outside the first frequency band.

Abstract: Described herein is a method for acquiring data using a marine vibrator towed by a vessel, the method comprising: obtaining data comprising at least one nominal pre-plot position in a horizontal plane; monitoring a position of the marine vibrator in the and a speed of the vessel; determining an offset between the position of the marine vibrator and the nominal pre-plot position in the towing direction; based on the offset and the vessel speed, adjusting one or more survey parameters and driving the vibrator with a series of one or more sweeps so that a predetermined frequency in the sweep or a subsequent sweep is emitted when the position of the vibrator is within a maximum distance of the nominal pre-plot position.

Abstract: Systems and methods for detecting peaks in a multi-band transmit signal are disclosed. In some embodiments, a method of operation of a multi-band transmitter for detecting peaks in a multi-band transmit signal which includes multiple transmit signals on a respective multiple frequency bands includes receiving a first band input signal for a first frequency band of the multi-band transmit signal and at least one additional band input signal for a respective at least one additional frequency band of the multi-band transmit signal. The method also includes detecting a peak of a combination of the first band input signal and the at least one additional band input signal taking into account phase information of the first band input signal and the at least one additional band input signal. In this manner, the detected peak might not be overestimated as when the peak detection fails to take into account the phase information.

Abstract: Systems and methods for detecting peaks in a multi-band transmit signal are disclosed. In some embodiments, a method of operation of a multi-band transmitter for detecting peaks in a multi-band transmit signal which includes multiple transmit signals on a respective multiple frequency bands includes receiving a first band input signal for a first frequency band of the multi-band transmit signal and at least one additional band input signal for a respective at least one additional frequency band of the multi-band transmit signal. The method also includes detecting a peak of a combination of the first band input signal and the at least one additional band input signal taking into account phase information of the first band input signal and the at least one additional band input signal. In this manner, the detected peak might not be overestimated as when the peak detection fails to take into account the phase information.

Abstract: This disclosure relates to a peak reduction circuit and method for reducing peaks by identifying peak sample values exceeding a pre-set threshold value in an aggregated baseband carrier signal and determining a maximum peak sample by detecting its maximum peak absolute value and phase. A search is performed a pre-determined search length beyond an identified peak. A stored, predetermined filter impulse response based on the carrier passband configuration is retrieved and its amplitude and phase of the predetermined filter impulse response is adjusted by means of the phase and absolute value of the determined maximum peak sample. Finally, the aggregated baseband carrier signal and the adjusted predetermined filter impulse response are combined by synchronizing their maximum peaks and their opposite phase values for adjusting the aggregated baseband carrier signal to said pre-set threshold value.

Abstract: A method of determining payload potential may include the steps of receiving data on a first bias voltage and a resulting first collected current of a first needle of a multi-needle Langmuir probe, receiving data on a second bias voltage and a resulting second collected current of a second needle of the multi-needle Langmuir probe, assigning a value for the electron temperature in which the multi-needle Langmuir probe was operating, and using the current and voltage data, the assigned electron temperature value and Langmuir probe theory to calculate the platform potential of the multi-needle Langmuir probe.

Abstract: This disclosure relates to a peak reduction circuit and method for reducing peaks by identifying peak sample values exceeding a pre-set threshold value in an aggregated baseband carrier signal and determining a maximum peak sample by detecting its maximum peak absolute value and phase. A search is performed a pre-determined search length beyond an identified peak. A stored, predetermined filter impulse response based on the carrier passband configuration is retrieved and its amplitude and phase of the predetermined filter impulse response is adjusted by means of the phase and absolute value of the determined maximum peak sample. Finally, the aggregated baseband carrier signal and the adjusted predetermined filter impulse response are combined by synchronizing their maximum peaks and their opposite phase values for adjusting the aggregated baseband carrier signal to said pre-set threshold value.

Abstract: A method of determining payload potential may include the steps of receiving data on a first bias voltage and a resulting first collected current of a first needle of a multi-needle Langmuir probe, receiving data on a second bias voltage and a resulting second collected current of a second needle of the multi-needle Langmuir probe, assigning a value for the electron temperature in which the multi-needle Langmuir probe was operating, and using the current and voltage data, the assigned electron temperature value and Langmuir probe theory to calculate the platform potential of the multi-needle Langmuir probe.

Abstract: A packet forwarding unit such as a Digital Subscriber Line Access Multiplexer (DSLAM) receives Ethernet packets carrying real-time information and forwards the information therein on output lines such as Asymmetric Digital Subscriber Lines (ADSLs). The DSLAM includes a clock device having an extraction unit and an adaptive clock. The extraction unit analyzes received packets to select streams of received packets from one destination to one user, and the adaptive clock generates a reference clock signal according to the arrival times of packets in the selected streams. The clock signal is sent to time reference units in DSL modems for the output lines.

Abstract: A forwarding unit such as a DSLAM (8) receives (21) Ethernet packets and forwards information therein on digital subscriber lines (27). For forwarding voice information of received Ethernet packets a reference clock signal is generated by a clock device (28) and provided to modems (23) for the digital subscriber lines. The clock device includes an extraction unit (29) for selecting at least one stream of received Ethernet packets, and a clock signal generating unit, configured as an adaptive clock unit (31), for generating a reference clock signal according to arrival times of packet in selected packet stream or streams. The reference clock signal can be provided to time reference units (25) in the modems. The extraction unit can analyze received Ethernet packets to find streams of packets from one destination to one user, the packets of each of the streams carrying real time information belonging to a real time service and then select one or more streams to be used by the adaptive clock unit.

Abstract: The present invention relates to a fuse-relay including a first pole (1, 11, 21, 31, 81) and a second pole (2, 12, 22, 32, 82). According to the invention the fuse-relay includes a resilient device (5, 18, 27, 37, 87) that is held in an elastically deformed position by a fuse (6, 16, 26, 36, 86) when the fuse (6, 16, 26, 36, 86) is whole; and in that the resilient device (5, 18, 27, 37, 87) is arranged to make or break a connection between the first pole (1, 11, 21, 31, 81) and the second pole (2, 12, 22, 32, 82) when the fuse (6, 16, 26, 36, 86) is blown. The invention also relates to a cross-connect with such fuse-relays, to a telecommunication system with such cross-connects and to a connection method.

Abstract: The present invention relates to an apparatus for cancellation of electromagnetic interferences (n), including means (3) for dividing a reference signal (sc) into a first and second signal (scl, scQ) having different phases, tow multipliers (4, 5) for each multiplying a weight coefficient to one of the phase displaced signals (scl, scQ) each and for outputting a multiplied signal each, and adder (6) for adding the two multiplied signals and for outputting a corrected reference signal (sn), and a subtracter (7) for subtracting the corrected reference signal (sn), from an input signal (sd) and for outputting an error signal (se). According to the invention different weight coefficients (l(f), Q(f)) are used for different frequencies or frequency bands (f) of the interference (n).

Abstract: The present invention relates to a fuse-relay including a first pole (1, 11, 21, 31, 81) and a second pole (2, 12, 22, 32, 82). According to the invention the fuse-relay includes a resilient device (5, 18, 27, 37, 87) that is held in an elastically deformed position by a fuse (6, 16, 26, 36, 86) when the fuse (6, 16, 26, 36, 86) is whole; and in that the resilient device (5, 18, 27, 37, 87) is arranged to make or break a connection between the first pole (1, 11, 21, 31, 81) and the second pole (2, 12, 22, 32, 82) when the fuse (6, 16, 26, 36, 86) is blown. The invention also relates to a cross-connect with such fuse-relays, to a telecommunication system with such cross-connects and to a connection method.

Abstract: A method and arrangement are proposed for compensating intersymbol interference (ISI) in a multicarrier transmission system. Compensation is based on the generation of an estimate of the ISI tail and subtracting the estimate from the received signal. This is achieved by determining an estimate of the transmitted symbols at the receiver by filtering with a transfer function that approximates the inverse of the channel transfer function for the carrier frequencies used. Estimated of two consecutively transmitted symbols are used to generate a difference symbol. When a string of zeroes is appended to this difference symbol and passed through a filter, a transient results which is equivalent to that generated by the consecutively transmitted symbols passed over the channel.

Abstract: To minimize power dissipation in a line driver (3) in a central office (CO) for driving a DSL connection to a network terminal (NT) with a predetermined maximum constellation size, the central office (CO) supplies the line driver (3) with a predetermined supply voltage during a training sequence, and transfers data with a predetermined power spectral density in all available channels. The network terminal (NT) measures the signal-to-noise ratio of each channel, and transfers information to the central office (CO) about channels having signal-to-noise ratios that enable transfer of data.

Abstract: A method and arrangement are proposed for compensating for intersymbol interference (ISI) in a multi-carrier transmission system. Compensation is based on the generation of an estimate of the ISI transient tail generated between consecutively transmitted symbols and subtracting this tail from the received signals. Each symbol includes a cyclic extension as prefix. The tail is generated from a tail portion isolated from the cyclic prefix. This tail portion is then used in a filter arrangement adapted to generate at least an estimate of the full transient signal. The filter function may be proceeded by a processing module for generating the initial conditions of the filter function from the transient signal portion. The full transient is then generated by inputting a predetermined value into the filter function. The processing module may be a second filter or processing arrangement adapted to perform calculations.

Abstract: A quality factor is associated to each carrier within a multicarrier system wherein a loading constant is computed as the quotient of a difference and the number of carriers that have no bits allocated, the difference being the difference of the sum of the bit error rates for carriers that have no bits allocated and the total remaining number of data bits that are not allocated, and allocating a number of bits to a carrier that has no bits allocated, the number of bits being the difference of the quality factor and the loading constant rounded to nearest integer, repeating the allocation until a predetermined fraction of the carriers have bits allocated, and reiterating the above steps until all carriers have bits allocated.

Abstract: A predistorter, a method for predistorting, and an amplifier include a predistorter. The predistorter is particularly suitable for predistorting an input signal of an amplifier, which amplifier introduces frequency dependent distortion that increase with the frequency. The predistorter makes use of a predistortion technique involving a high pass filter such that distortion, which compensates for the distortion introduced by the amplifier, is introduced in an output signal of the predistorter for the specific frequencies for which further distortion compensation is required. An advantage is that the predistorter allows the performance of an amplifier to be improved by reducing distortion and increasing linearity. Thereby the predistorter allows low power amplifiers with relaxed distortion requirements to be used as, for example, line drivers in many telecommunications systems.

Abstract: A line driver supplied with a power supply voltage from a power supply uses whole or part of the power supply voltage to generate the output voltage if the input voltage is within a predefined range; loads at least one capacitor with at least one capacitor voltage; and uses whole or part of the at least one capacitor voltage in addition to whole or part of the power supply voltage to generate the output voltage if the input voltage is outside the predefined range.

Abstract: A predistorter, a method for predistorting, and an amplifier include a predistorter. The predistorter is particularly suitable for predistorting an input signal of an amplifier, which amplifier introduces frequency dependent distortion that increase with the frequency. The predistorter makes use of a predistortion technique involving a high pass filter such that distortion, which compensates for the distortion introduced by the amplifier, is introduced in an output signal of the predistorter for the specific frequencies for which further distortion compensation is required. An advantage is that the predistorter allows the performance of an amplifier to be improved by reducing distortion and increasing linearity. Thereby the predistorter allows low power amplifiers with relaxed distortion requirements to be used as, for example, line drivers in many telecommunications systems.