A method for reducing far-end crosstalk in a digital line system is provided. The method includes receiving a noise related value fed back from a first receiving end to a first transmitting end over a first line. The method further includes pre-coding, a first signal and crosstalk source signals according to values of filtering parameters to form a synthesized signal corresponding to the first line. The crosstalk source signals are related to second signals over a second line. The method further includes transmitting the synthesized signal from the first transmitting end to the first receiving end over the first line. A corresponding device for reducing far-end crosstalk in a digital line system is provided.

Non-linear interference cancellation techniques are provided for wireless transceivers. Non-linear reduction of interference of a transmit signal on a received signal in a transceiver device, comprises applying the transmit signal to a first non-linear system; applying the received signal to a second non-linear system; and subtracting an output of the first non-linear system output from an output of second non-linear system output to produce an interference mitigated received signal. The first non-linear system and/or the second non-linear system can be implemented using one or more of a Volterra series and a Generalized Memory Polynomial Model. System parameters of the first non-linear system and/or the second non-linear system are adapted to reduce a power of the interference mitigated received signal.

Non-linear interference cancellation techniques are provided for wireless transceivers. Non-linear reduction of interference of a transmit signal on a received signal in a transceiver device, comprises applying the transmit signal to a first non-linear system; applying the received signal to a second non-linear system; and subtracting an output of the first non-linear system output from an output of second non-linear system output to produce an interference mitigated received signal. The first non-linear system and/or the second non-linear system can be implemented using one or more of a Volterra series and a Generalized Memory Polynomial Model. System parameters of the first non-linear system and/or the second non-linear system are adapted to reduce a power of the interference mitigated received signal.

Methods and systems for providing and processing data are disclosed. An example method can comprise determining a first weighted probability based on a probability of occurrence of a noise signal and a first likelihood ratio. The first likelihood ratio is based on a frequency distribution of the noise signal. An example method can comprise determining a second weighted probability based on a probability of non-occurrence of the noise signal and a second likelihood ratio. An example method can comprise determining a combination of the first weighted probability and the second weighted probability, and providing the combination to a decoder configured to decode a value based on the combination.

Methods and systems for providing and processing data are disclosed. An example method can comprise determining a first weighted probability based on a probability of occurrence of a noise signal and a first likelihood ratio. The first likelihood ratio is based on a frequency distribution of the noise signal. An example method can comprise determining a second weighted probability based on a probability of non-occurrence of the noise signal and a second likelihood ratio. An example method can comprise determining a combination of the first weighted probability and the second weighted probability, and providing the combination to a decoder configured to decode a value based on the combination.

A signal transmission system for a satellite comprises means (31) for producing a signal to be transmitted; a first signal channel (37) which includes a first digital pre-distortion device (32) for applying pre-distortion to the signal; a second signal channel (38) for processing an envelope of the signal, which includes a second digital pre-distortion device (35) for applying pre-distortion to the envelope of the signal; and output means (34) for transmitting the signal.

A signal transmission system for a satellite comprises means (31) for producing a signal to be transmitted; a first signal channel (37) which includes a first digital pre-distortion device (32) for applying pre-distortion to the signal; a second signal channel (38) for processing an envelope of the signal, which includes a second digital pre-distortion device (35) for applying pre-distortion to the envelope of the signal; and output means (34) for transmitting the signal.

A radio-frequency identification (RFID) reader having fast-adaptive echo cancellation for backscatter-modulated signals is described. The echo cancellation includes subtracting an RF-level cancel signal from the received signal, where the cancel signal is generated based upon an error measured in the receive signal after down-conversion to baseband and low-pass filtering. The cancel signal is based upon a cumulative sum or integral of error signals and an estimated complex-valued transfer function of the scaling circuit. Methods of quick calibration of the reader are described, including accounting for circuit offsets and determining the estimated complex-valued transfer function.

A radio-frequency identification (RFID) reader having fast-adaptive echo cancellation for backscatter-modulated signals is described. The echo cancellation includes subtracting an RF-level cancel signal from the received signal, where the cancel signal is generated based upon an error measured in the receive signal after down-conversion to baseband and low-pass filtering. The cancel signal is based upon a cumulative sum or integral of error signals and an estimated complex-valued transfer function of the scaling circuit. Methods of quick calibration of the reader are described, including accounting for circuit offsets and determining the estimated complex-valued transfer function.

Wide bandwidth digital pre-distortion (DPD) in a remote unit(s) for a wireless communications system (WCS) is disclosed. In embodiments disclosed herein, a remote unit(s) includes at least two transceiver circuits, each configured to process (e.g., perform DPD) a respective downlink digital communications signal corresponding to a portion of the carrier bandwidth. Each of the transceiver circuits is further configured to convert the respective downlink digital communications signal into a respective downlink RF communications signal. The respective downlink RF communications signals generated by the transceiver circuits are subsequently combined to form a downlink RF communications signal(s) associated with the carrier bandwidth. By employing multiple transceiver circuits in the remote unit(s) to each handle a portion of the carrier bandwidth, it may be possible to mitigate processing bandwidth limitations of the remote unit(s), thus making it possible to satisfy the regulatory and/or operational requirements for supporting wide bandwidth communications in the WCS.