Abstract: There is provided mechanisms for OTA calibration of an AAS. The AAS comprises N antenna branches, each of which comprises a respective subarray. The subarray of each antenna branch gives rise to a subarray antenna pattern extending over an angular interval. A method is performed by a test equipment. The method comprises obtaining measurement values for each of the antenna branches. At least one measurement value is obtained per each antenna branch. The method comprises determining one calibration factor value per antenna branch using the measurement values and taking the subarray antenna patterns into account. The method comprises applying the determined calibration factor values to the N antenna branches, thereby calibrating the AAS.

Abstract: The present disclosure relates to an antenna system (1, 1?) comprising: —a first set of antenna ports (2), —a second set of antenna ports (3) separate from the first set of antenna ports (2), —a third set of antenna ports (28) that at least partly comprises each one of the first set of antenna ports (2) and the second set of antenna ports (3), —a transmitter arrangement (4, 4?), and —a receiver (5, 5?). The transmitter arrangement (4, 4?) comprises a first transmitter (4a, 4a?) adapted for transmission of signals by means of a first downlink communication resource (6, 38) via the first set of antenna ports (2) and a second transmitter (4b, 4b?) adapted for transmission of signals by means of a second downlink communication resource (7, 39) via the second set of antenna ports (3).

Abstract: The present disclosure relates to an antenna system (1, 1?) comprising: —a first set of antenna ports (2), —a second set of antenna ports (3) separate from the first set of antenna ports (2), —a third set of antenna ports (28) that at least partly comprises each one of the first set of antenna ports (2) and the second set of antenna ports (3), —a transmitter arrangement (4, 4?), and—a receiver (5, 5?). The transmitter arrangement (4, 4?) comprises a first transmitter (4a, 4a?) adapted for transmission of signals by means of a first downlink communication resource (6, 38) via the first set of antenna ports (2) and a second transmitter (4b, 4b?) adapted for transmission of signals by means of a second downlink communication resource (7, 39) via the second set of antenna ports (3).

Abstract: A heterodyne receiver structure comprises a frequency conversion block arranged to convert an incoming analog radio frequency (RF) signal to an analog intermediate frequency (IF) signal; a filter block arranged to filter said analog IF signal; and an analog-to-digital (AD) converter block arranged to convert said filtered analog IF signal to a digital signal, wherein the AD converter block (309) is arranged to convert the filtered analog IF signal to the digital signal by using a sampling frequency (fs) which is at least N times a maximum bandwidth of the filtered analog IF signal, wherein the frequency spectrum from zero to the sampling frequency is divided into N frequency zones of equal width, wherein N is an even positive number higher than two; the frequency conversion block (304) is arranged to convert the incoming analog RF signal to the analog IF signal such that the analog IF signal is located in any of the N/2-1 frequency zones having lowest frequency; and the filter block (306-308) is arranged to l

Abstract: A heterodyne receiver structure comprises a frequency conversion block arranged to convert an incoming analogue radio frequency (RF) signal to an analogue intermediate frequency (IF) signal; a filter block arranged to filter said analogue IF signal; and an analogue-to-digital (AD) converter block arranged to convert said filtered analogue IF signal to a digital signal, wherein the AD converter block (309) is arranged to convert the filtered analogue IF signal to the digital signal by using a sampling frequency (fs) which is at least N times a maximum bandwidth of the filtered analogue IF signal, wherein the frequency spectrum from zero to the sampling frequency is divided into N frequency zones of equal width, wherein N is an even positive number higher than two; the frequency conversion block (304) is arranged to convert the incoming analogue RF signal to the analogue IF signal such that the analogue IF signal is located in any of the N/2-1 frequency zones having lowest frequency; and the filter block (306-3

Abstract: The invention relates to a method and a device for processing an electromagnetic signal comprising first and second carriers at first and second carrier frequencies. The method comprises splitting the signal into first and second branches, a first shifting of the frequency of the signal in each of the branches by respective first frequency shifts, and filtering the signal in the first and the second branch in respective first filters. In addition, there is a second shifting of the frequency in each of the branches by respective second frequency shifts, and a first frequency distance between the first frequency shifts, such that after the first shift, the first carrier in the first branch has essentially the same center frequency as the second carrier in the second branch. The first filters have the same filter characteristics, so that the signal in each branch after the first filter comprises only one of said first or second carrier wave, but at the same center frequency.