摘要:
A calibration apparatus for an antenna array comprising a plurality of transceiver paths (10-N) is disclosed. The calibration apparatus uses a spectrally shaped calibration signal (30-N) fitting the payload signal for calibration of the transceiver paths of the antenna array. (11-N). The calibration apparatus is adapted to calibrate a transmit portion of the transceiver paths. The calibration apparatus is further adapted to calibrate a receive portion of the transceiver path. Discloses is also a method of calibrating the antenna array, wherein the calibration signal is spectrally shaped. Further is disclosed an antenna array comprising the calibration apparatus, the antenna being adapted to carry out the method of calibration.
摘要:
An antenna array (60) for a mobile communications network is disclosed which comprise mechanical devices for altering a direction of a first beam (70) and an electronic beam forming apparatus for shaping a second beam (75). A method for tilting radio beams (70, 75) in a mobile communications network using the antenna array (60) is also disclosed. The method comprises mechanical tilting a first protocol radio beam (70) and electronic tilting a second protocol, radio beam (75),
摘要:
An antenna array (10) for the transmission of signals (20) is disclosed which comprises a plurality of antenna elements (30) connected to a plurality of transceivers (40). The plurality of transceivers (40) receive transceiver signals for transmission to the plurality of antenna elements (30). The antenna comprises a failure detector or monitoring and control system (80) connected to the plurality of transceivers, which autonomously detects malfunction of the individual transceivers and reports this to the signal processor (50) without involvement of the transmitter and receiver (70). The antenna array (10) also comprises a signal processor (50) connected to the plurality of transceivers (40) and adapted to weight using complex values the transceiver signals for automatically compensating for power losses by tilt adjustments and for interference by suppression of sidelobes (220) of the signals (20) based on the information from the failure detector or monitoring and control system (80).
摘要:
The present disclosure relates to a radio system (1), a base band unit (20) and a method (100) for relaying radio signals in a cell (101) of a mobile network. The radio signals are relayed according to a service criterion (300). With the present invention the radio signals are grouped into a grouped payload signal (30-1, 30-2, . . . , 30-M) and a grouped receive signal (220-1, 220-2, . . . , 220-M) according to the service criterion (300). The grouped payload signal (30-1, . . . , 30-M) and the grouped receive signal (220-1, 220-2, . . . , 220-M) are associated with a beam forming vector (40-1, 40-2, . . . , 40-M). The grouping according to the present disclosure helps to improve a quality of service provided to an individual user of the mobile network. The associated beam forming vector (40-1, 40-2, . . . , 40-M) may be provided and adjusted at a digital radio interface DRI (200). Furthermore the present disclosure provides various computer programme product implementing the various aspects.
摘要:
An active antenna array (10) for a mobile communications system is disclosed which comprises a plurality of receive paths (30-1, ..., 30-N) in which an individual one of the receive paths (30-1, ..., 30-N) is connected between an antenna element (20-1, ..., 20-N) and an analogue to digital converter (110-1, ..., 110-N) and wherein the analogue to digital converter (110-1, ..., 110-N) is adapted to digitise a receive signal to form a digitised receive signal. The active antenna array (10) further comprises a sounding signal generator (260) for generating a sounding signal in which the sounding signal is supplied to at least two of the plurality of receive paths (30-1, ..., 30-N) and a receive signal subtraction device for subtracting a wanted signal from the digitised receive signal.
摘要:
Antenna system connectable to a base station, the antenna system comprising a digital radio unit (200) connectable to at least one antenna element (220), wherein the digital radio unit (200) comprises: at least one micro radio (230) for receiving/sending digital radio signals having a digital down-converter (350) / a digital up-converter (310) and a digital signal converter (234; 235). The at least one micro radio (230) converts the digital radio signals to analogue RF (radio frequency) signals and vice versa. The at least one micro radio (23) has at least one hub (240) for processing digital radio signals and control signals and for routing said digital radio signals and control signals via at least one serial link (260) and at least one interface (258, 259). The at least one serial link (260) is provided between the at least one hub (240) and the at least one micro radio (230).
摘要:
The present disclosure relates to a radio station (1) providing a digital predistortion (24) to be imposed on a payload signal (15). The digital predistortion (24) is usable as a general predistortion for several transmit paths (70-1, ..., 70-N) of the radio station (1). The radio station (1) provides coupled transmit signals (80-1, ..., 80-N) to be combined within a combiner (100) forming a common feedback signal (155). The common feedback signal (155) is relayed along a common feedback path (150). A digital predistortion update unit (22) is adapted to update the digital predistortion (24) in order to linearise a transfer characteristics of the transmit paths (70-1, ..., 70-N). The disclosure further relates to a method of digitally predistorting a payload signal (15) in order to linearise a transmit characteristics of the transmit paths (70-1, ..., 70-N).
摘要:
A digital sigma-delta modulator (100) for modulating a digital input signal (x) is described. The digital sigma-delta modulator (100) comprises a quantizer (115) for quantizing an input signal (s) and producing a quantized output signal (y) at a first output (110) and an error output signal (-q) at a second output (165), at least one feed-back loop (120, 125) connected to an input adder (140) and either the first output (110) or the second output (165) of the quantizer (115) and a feed back filter (130, 135) in the at least one feed back loop (120, 125). The input adder (140) produces the sum signal (s) by adding the digital input signal (x) at an input (105) and output signals of the at least one feed-back loop filters (130,135).
摘要:
Digital Transceiver (DTRX) usable in a radio communications systems for transmitting and receiving digital base-band signals, wherein the DTRX (300) comprises: at least one digital up-converter (DUC) (310) for transmitting digital base-band signals and at least one digital down-converter for receiving digital base-band signals. In one aspect of the invention the DUC (310) comprises at least two over-sampling units (314, 315), at least one quadrature modulation unit (340), and at least one time-discrete sigma delta band-pass modulator (318). The digital down-converter comprises at least one quadrature demodulation unit (360), at least two decimator units (356,357), and at least two sub- sampling units (354, 355). The digital base-band signal comprises an in-phase component (I-signal) and a quadrature component (Q-signal).
摘要:
A digital sigma-delta modulator (100) for modulating a digital input signal (x) is described. The digital sigma-delta modulator (100) comprises a quantizer (115) for quantizing an input signal (s) and producing a quantized output signal (y) at a first output (110) and an error output signal (-q) at a second output (165), at least one feed-back loop (120, 125) connected to an input adder (140) and either the first output (110) or the second output (165) of the quantizer (115) and a feed back filter (130, 135) in the at least one feed back loop (120, 125). The input adder (140) produces the sum signal (s) by adding the digital input signal (x) at an input (105) and output signals of the at least one feed-back loop filters (130,135).