Transmitting and receiving arrangement with interference signal suppression control
A transmitting and receiving arrangement is disclosed having a transmission path, a reception path, and a control device for suppression of interference signals which are produced by crosstalk from the transmission path to the reception path. The control device inputs correction signals that are derived from the transmission signals into the reception path at a point therein such that the interference signals are suppressed downstream from the point. The control device has a detector that detects the interference signals on the basis of characteristics of the transmission signals.
1. A transmitting and receiving arrangement, comprising:
a transmission path for the transmission of signals;
a reception path for the reception of signals; and
a control device configured to suppress interference signals in the reception path that are produced by crosstalk from the transmission path by inputting correction signals derived from signals to be transmitted via the transmission path into the reception path at an input point thereof such that the interference signals are suppressed downstream from the input point in the reception path, and
wherein the control device comprises a detector device configured to detect the interference signals that are present in the reception path downstream from the input point based on at least one characteristic of the signals to be transmitted via the transmission path.
2. The transmitting and receiving arrangement of claim 1 , further comprising:
a frequency generator configured to produce a conversion frequency;
the transmission path comprising a first frequency conversion device configured to convert the signals to be transmitted from a first frequency band to a second frequency band using the conversion frequency; and
wherein the detector device is configured to detect the interference signals that are present in the reception path downstream from the input point using the conversion frequency.
3. The transmitting and receiving arrangement of claim 2 , wherein the detector device comprises a second frequency conversion device configured to convert signals that are present in the reception path downstream from the input point using the conversion frequency.
4. The transmitting and receiving arrangement of claim 3 , further comprising a low-pass filter coupled downstream of the second frequency conversion device.
5. The transmitting and receiving arrangement of claim 2 , wherein the first frequency band comprises baseband, and the conversion frequency comprises the carrier frequency of the transmitted signals.
6. The transmitting and receiving arrangement of claim 1 , wherein the control device comprises:
an output device configured to output signals to be transmitted from the transmission path; and
an input device configured to input the correction signals into the reception path.
7. The transmitting and receiving arrangement of claim 6 , wherein the output device comprises a line directional coupler.
8. The transmitting and receiving arrangement of claim 6 , wherein the input device comprises an adder configured to superimpose the correction signals on the signals that are present in the reception path.
9. The transmitting and receiving arrangement of claim 1 , wherein the control device comprises a variable-gain amplifier or a phase shifter with a variable phase shift, wherein the amplifier or the phase shifter is fed by signals associated with the transmission path, and wherein the correction signals are produced by the amplifier or by the phase shifter, and are input into the reception path at the input point.
10. The transmitting and receiving arrangement of claim 8 , wherein the gain of the amplifier or the phase shift of the phase shifter are configured to vary as a function of the interference signals detected by the detector device.
11. The transmitting and receiving arrangement of claim 1 , wherein the control device comprises a computation device configured to employ the interference signals detected by the detector device to produce the correction signals.
12. A method for suppressing crosstalk interference signals in a transmitting and receiving arrangement which has a transmission path for the transmission of signals, and has a reception path for the reception of signals, comprising:
(a) producing correction signals that are derived from signals to be transmitted via the transmission path;
(b) inputting the correction signals into the reception path at an input point thereof that causes a suppression of the interference signals downstream of the input point;
(c) detecting the interference signals present in the reception path downstream from the input point based on at least one characteristic of the signals to be transmitted via the transmission path;
(d) producing new correction signals that take into account the detected interference signals, in accordance with (a); and
(e) repeating (c) and (d).
13. The method of claim 12 , further comprising:
producing a conversion frequency;
converting the signals to be transmitted via the transmission path using the conversion frequency from a first frequency band to a second frequency band; and
detecting the interference signals that are present in the reception path downstream from the input point using the conversion frequency.
14. The method of claim 13 , wherein the signals that are present in the reception path downstream from the input point are converted using the conversion frequency to detect the interference signals which are present in the reception path downstream from the input point.
15. A transceiver, comprising:
a transmission path configured to generate a transmission signal;
a reception path configured to receive a signal transmitted to the transceiver; and
a control device configured to generate a correction signal and superimpose the correction signal over the received signal in the reception path to generate a compensated received signal, wherein the correction signal is a function of the transmission signal and the compensated received signal.
16. The transceiver of claim 15 , wherein the control device comprises a coupling element associated with the transmission path, and configured to tap off a signal associated with the transmission signal for use in generating the correction signal.
17. The transceiver of claim 15 , wherein the control device further comprises:
detection circuitry configured to ascertain an amount of remaining crosstalk associated with the transmission signal in the compensated received signal in the reception path, and generate a control signal in response thereto; and
a correction signal generator configured to receive the control signal and modify an amplitude, or a phase, or both, of a signal derived from the transmission signal to form the correction signal.
18. The transceiver of claim 17 , further comprising an adder circuit configured to superimpose the correction signal and the received signal to form the compensated received signal.
19. The transceiver of claim 17 , wherein the detection circuitry is configured to ascertain the amount of remaining crosstalk based on at least one characteristic of the transmission signal.
20. The transceiver of claim 19 , wherein the at least one characteristic of the transmission signal comprises a carrier frequency at which the transmission signal is transmitted from an antenna associated with the transceiver.