Abstract: A duplex unit allowing simultaneous transmission and reception of microwave signals on at least partly overlapping frequency bands, comprising an interference canceller unit and a control unit, the duplex unit being arranged to receive a transmit signal and to output a first part of the transmit signal at an antenna port, the duplex unit further being arranged to receive a receive signal comprising a payload signal at the antenna port, and to output a combination of the receive signal and a filtered transmit signal as an interference suppressed receive signal of the duplex unit.

Abstract: Example embodiments presented herein are directed towards a system, and corresponding method, for interference suppression of wireless communication signals. The method may comprise embedding a differential phase tracking signal (e.g., a zero amplitude differential phase tracking signal) in a transmitted wireless communication signal. Thereafter, a differential phase may be measured between the embedded transmitted wireless communication signal and a wireless reference signal. This differential phase measurement may be utilized in the suppression of interference in the wireless communication signal.

Abstract: A duplex unit allowing simultaneous transmission and reception of microwave signals on at least partly overlapping frequency bands, comprising an interference canceller unit and a control unit, the duplex unit being arranged to receive a transmit signal and to output a first part of the transmit signal at an antenna port, the duplex unit further being arranged to receive a receive signal comprising a payload signal at the antenna port, and to output a combination of the receive signal and a filtered transmit signal as an interference suppressed receive signal of the duplex unit.

Abstract: A method of compensating phase error of a received signal is disclosed. The signal comprises a symbol set comprising a plurality of symbols of a first type having an N-Quadrature Amplitude Modulation, N-QAM, signal configuration, where N is an integer larger than 4, and at least one symbol of a second type having an Amplitude and Phase-Shift Keying, A-PSK, signal configuration, wherein both the symbols of the first type and of the second type carries data and wherein the symbols of the second type also are arranged as pilot symbols for determination of phase rotation determination. A receiver and transmitter, as well as a communication system, employing the symbol set are disclosed.

Abstract: A signal processing device for a diversity combining radio receiver is disclosed. Said device comprises a plurality of receive branches and a joint detector adapted to determine a joint received symbol based on a combined signal. Said device also comprises a control unit adapted to determine a branch signal error based on the joint received symbol and the input signal of that receive branch. Each receive branch further comprises an adaptive filter. The control unit is adapted to update the coefficients of the adaptive filter of each receive branch based on a weighted signal error combination, wherein weight of the weighted signal error combination is selected based on channel conditions. A corresponding diversity combining radio receiver, a corresponding electronic apparatus, a corresponding method, a corresponding computer program product, and a corresponding computer readable medium are also disclosed.

Abstract: Example embodiments comprise a diversity receiver, and corresponding method, for measuring a differential phase between a first local oscillator of a first antenna and a second local oscillator of a second antenna in the presence of a primary interference signal and at least one secondary interference signal. The method may comprise receiving a primary communication signal, a primary reference signal and additional reference signals, and processing these signals such that a summation signal does not substantially comprise the at least one secondary interference signal. The estimation of differential phase is achieved by a phase shift calculation between processed signal components, using that a summation of all signal components equals, or is approximately equal to, a predetermined signal.

Abstract: Example embodiments comprise a diversity receiver, and corresponding method, for measuring a differential phase between a first local oscillator of a first antenna and a second local oscillator of a second antenna in the presence of a primary interference signal and at least one secondary interference signal. The method may comprise receiving a primary communication signal, a primary reference signal and additional reference signals, and processing these signals such that a summation signal does not substantially comprise the at least one secondary interference signal. The estimation of differential phase is achieved by a phase shift calculation between processed signal components, using that a summation of all signal components equals, or is approximately equal to, a predetermined signal.

Abstract: The present solution relates to a method in a communication node (201, 204, 210, 213) for canceling interference between a plurality of signals in a communication system (200). The communication node receives (501), at each of a plurality of receiver antennas (407), a respective signal. The communication node (201, 204, 210, 213) cancels (502) a first part of interference between the plurality of received signals. Then, the interference cancelled signals and the received signals are filtered (504) before a second part of interference between the filtered signals is cancelled (505).

Abstract: Example embodiments presented herein are directed towards a system, and corresponding method, for interference suppression of wireless communication signals. The method may comprise embedding a differential phase tracking signal (e.g., a zero amplitude differential phase tracking signal) in a transmitted wireless communication signal. Thereafter,a differential phase may be measured between the embedded transmitted wireless communication signal and a wireless reference signal. This differential phase measurement may be utilized in the suppression of interference in the wireless communication signal.

Abstract: A method of compensating phase error of a received signal is disclosed. The signal comprises a symbol set comprising a plurality of symbols of a first type having an N-Quadrature Amplitude Modulation, N-QAM, signal configuration, where N is an integer larger than 4, and at least one symbol of a second type having an Amplitude and Phase-Shift Keying, A-PSK, signal configuration, wherein both the symbols of the first type and of the second type carries data and wherein the symbols of the second type also are arranged as pilot symbols for determination of phase rotation determination. A receiver and transmitter, as well as a communication system, employing the symbol set are disclosed.

Abstract: A signal processing device for a diversity combining radio receiver is disclosed. Said device comprises a plurality of receive branches and a joint detector adapted to determine a joint received symbol based on a combined signal. Said device also comprises a control unit adapted to determine a branch signal error based on the joint received symbol and the input signal of that receive branch. Each receive branch further comprises an adaptive filter. The control unit is adapted to update the coefficients of the adaptive filter of each receive branch based on a weighted signal error combination, wherein weight of the weighted signal error combination is selected based on channel conditions. A corresponding diversity combining radio receiver, a corresponding electronic apparatus, a corresponding method, a corresponding computer program product, and a corresponding computer readable medium are also disclosed.

Abstract: The present invention relates to a receiver being arranged to estimate a received signal. The receiver comprises demodulator means arranged to demodulate received signal data symbols of a higher constellation order such that a demodulated signal is obtained. The demodulator means comprises a main carrier recovery Phase-Locked Loop 9 arranged to demodulate 17 the data and pilot symbols. The demodulator means further comprises phase calculation means 5 arranged to provide 16 phase information from the pilot symbols of lower constellation order to the main carrier recovery PLL 9. The invention is particularly characterized in that the phase calculation means further comprises a pilot PLL 18 arranged to extract 15 the phase information from the pilot symbols. The invention also relates to a method in the receiver for estimating the received signal.

Abstract: The present solution relates to a method in a communication node (201, 204, 210, 213) for canceling interference between a plurality of signals in a communication system (200). The communication node receives (501), at each of a plurality of receiver antennas (407), a respective signal. The communication node (201, 204, 210, 213) cancels (502) a first part of interference between the plurality of received signals. Then, the interference cancelled signals and the received signals are filtered (504) before a second part of interference between the filtered signals is cancelled (505).

Abstract: Method of communicating digital data in which frames (8) are transmitted cyclically whereby a first number of symbols is transmitted according to a first keying mode (II) using a first constellation, and a second number of symbols is transmitted according to a second keying mode (L) using a second constellation. The first and second keying modes (H, L) are used at predetermined positions in the frame, whereby both the symbols according to the first and second keying mode carry information under at least an operative traffic phase.

Abstract: A method of demodulating digital data using M?ary QAM has been disclosed, comprising the steps of detecting a complex symbol vector D, establishing within which reference symbol boundaries the detected symbol vector D falls, the given reference symbol boundaries being associated with a complex reference vector R. Quadrature components (E_I and E_Q) of an error vector (E) constituting the difference between the detected vector D and the associated reference vector R are found and an error control signal (E?) as feed back signal in the demodulation stage is approximated. The influence of thermal noise in the receiver stage has been limited by a weighting and/or by noise balancing.

Abstract: The present invention use the properties of a TDD-transmission on a specific mixer in such a manner that in the transmit mode a first RF signal is amplified in the mixer with an amplification factor greater than, or equal to, or less than one, and in the receive mode the received RF signal is mixed with a second RF signal.

Abstract: The present invention use the properties of a TDD-transmission on a general mixer in such a manner that in the transmit mode a first RF signal is amplified in the mixer with an amplification factor greater than, or equal to, or less than one, and in the receive mode the received RF signal is mixed with a second RF signal.

Abstract: A device and a method for deviation determination for use during transfer of a phase shift modulated information-carrying signal between a transmitter and a receiver. The deviation determination is based on the presence of phase-linear segments, i.e., parts of sequences of phase changes that have the same phase change. Segments having three or more consecutive phase changes of the same value are extracted. An identification of the filtered-out segments is performed in order to determine which nominal phase-linear sequences the segments belong to. After this, the deviation and possibly a correction signal can be determined.