Interference cancellation method in radio system
View Patent ↗A receiver in a radio system, comprising one or more antennas ( 600 A to 600 B) for receiving a signal including signal components descriptive of a signal to be detected and an interfering signal. The receiver comprises means for measuring ( 614 A to 614 B) the antenna-specific reception power of the received signal and means for weighting ( 614 A to 614 B) the signal received in each antenna by a antenna-specific weighting coefficient proportional to the reception power of said signal.
1. A method, comprising:
receiving a signal including signal components descriptive of a signal to be detected and an interfering signal;
measuring an antenna-specific reception power of the received signal; and
weighting the received signal by an antenna-specific weighting coefficient proportional to the reception power of said signal.
wherein the antenna-specific weighting coefficient is the reciprocal of the reception power of the signal.
2. A method as claimed in claim 1 , wherein the received signal is weighted time-dependently by the weighting coefficient proportional to the reception power of the signal.
3. A method as claimed in claim 1 , further comprising:
comparing the reception power of the signal to be detected with the reception power of the interfering signal to generate a signal-to-noise ratio,
wherein an antenna-specific signal to be detected is weighted by the weighting coefficient proportional to the reception power only if the signal-to-noise ratio is below a preset threshold value.
4. A method as claimed in claim 1 , wherein the method is performed substantially at symbol pace.
5. A method as claimed in claim 1 , wherein the interfering signal is at least partly generated by a second radio system operating in the same frequency band as the radio system.
6. A method as claimed in claim 1 , wherein the signal to be detected is a wideband code division multiple access signal and the interfering signal is at least partly generated by a second system operating in the same frequency band as the wideband code division multiple access system.
7. A method, comprising:
receiving a signal including signal components descriptive of a signal to be detected and an interfering signal using at least one antenna in a receiver;
measuring an antenna-specific reception power of the received signal;
weighting the received signal by a weighting coefficient proportional to the reception power of said signal;
despreading user signals from the received signal;
generating user-specific channel estimates from the despread user signals;
restoring user signals based on the channel estimates to generate restored user signals; and
forming a restored detection signal based on the restored user signals,
wherein the weighting proportional to the antenna-specific reception power is directed to one or more of the following signals: a spread signal to be detected, despread user signals, user-specific channel estimates, restored user signals, a restored signal to be detected.
8. An apparatus, comprising:
a receiver configured to receive a signal including signal components descriptive of a signal to be detected and an interfering signal;
a measuring unit configured to measure an antenna-specific reception power of the received signal; and
a weighting unit configured to weight the received signal by an antenna-specific weighting coefficient proportional to the reception power of said signal,
wherein the antenna-specific weighting coefficient is the reciprocal of the reception power of the received signal.
9. An apparatus as claimed in claim 8 , wherein the weighting unit is configured to weight the received signal time-dependently by the weighting coefficient proportional to the reception power of the signal.
10. An apparatus as claimed in claim 8 , comprising:
determining unit configured to determine the reception power of the signal to be detected; and
comparing unit configured to compare the reception power of the signal to be detected with the reception power of the interfering signal to generate a signal-to-noise ratio,
wherein the weighting unit is further configured to weight the antenna-specific signal to be detected by the weighting coefficient proportional to the reception power only if the signal-to-noise ratio is below a preset threshold value.
11. An apparatus as claimed in claim 8 , wherein the apparatus is configured to perform the weighting substantially at symbol pace.
12. An apparatus as claimed in claim 8 , wherein the interfering signal is at least partly generated by a second radio system operating in the same frequency band as the radio system.
13. An apparatus as claimed in claim 8 , wherein the signal to be detected is a wideband code division multiple access signal and the interfering signal is at least partly generated by a second system operating in the same frequency band as the wideband code division multiple access system.
14. The apparatus as claimed in claim 8 , wherein the apparatus is a receiver.
15. An apparatus, comprising:
a receiver configured to receive a signal including signal components descriptive of a signal to be detected and an interfering signal;
a measuring unit configured to measure an antenna-specific reception power of the received signal;
a weighting unit configured to weight the received signal by an antenna specific weighting coefficient proportional to the reception power of said signal;
a despreading unit configured to despread user signals from the received signals;
a generator configured to generate channel estimates from the despread user signals;
a restoring unit configured to restore user signals based on the channel estimates to generate restored user signals; and
a combining unit configured to combine restored user signals to generate a restored signal to be detected,
wherein the weighting unit is further configured to direct a weighting proportional to the antenna-specific reception power to one or more of the following signals: a spread signal to be detected, despread user signals, user-specific channel estimates, restored user signals, a restored signal to be detected.
16. The apparatus as claimed in claim 15 , wherein the apparatus is a receiver.
17. An apparatus, comprising:
receiving means for receiving a signal including signal components descriptive of a signal to be detected and an interfering signal in a radio system;
measuring means for measuring an antenna-specific reception power of the received signal; and
weighting means for weighting the received signal by a antenna-specific weighting coefficient proportional to the reception power of said signal,
wherein the antenna-specific weighting coefficient is the reciprocal of the reception power of the received signal.
18. A computer program embodied on a computer-readable medium comprising computer code for causing a computer to perform a method for receiving a signal in a radio system, the method comprising:
receiving a signal including signal components descriptive of a signal to be detected and an interfering signal;
measuring an antenna-specific reception power of the received signal; and
weighting the received signal by a weighting coefficient proportional to the reception power of said signal,
wherein the antenna-specific weighting coefficient is the reciprocal of the reception power of the received signal.
19. An apparatus, comprising:
at least one receiver configured to receive a signal including signal components descriptive of a signal to be detected and an interfering signal;
a measuring unit configured to measure an antenna-specific reception power of the received signal; and
a weighting unit configured to weight the signal received in the receivers by a antenna-specific weighting coefficient proportional to the reception power of said signal,
wherein the antenna-specific weighting coefficient is the reciprocal of the reception power of the signal received in said receiver.
20. The apparatus as claimed in claim 19 , wherein the weighting unit is configured to weight the received signal time-dependently by the weighting coefficient proportional to the reception power of the signal.
21. The apparatus as claimed in claim 19 , comprising:
a determining unit configured to determine the reception power of the signal to be detected; and
a comparing unit configured to compare the reception power of the signal to be detected with the reception power of the interfering signal to generate a signal-to-noise ratio,
wherein the weighting unit is further configured to weight the antenna-specific signal to be detected by the weighting coefficient proportional to the reception power only if the signal-to-noise ratio is below a preset threshold value.
22. An apparatus, comprising:
at least one receiver configured to receive a signal including signal components descriptive of a signal to be detected and an interfering signal;
a measuring unit configured to measure an antenna-specific reception power of the received signal;
a weighting unit configured to weight the signal received in the receivers by a antenna-specific weighting coefficient proportional to the reception power of said signal;
a despreading unit configured to despread user signals from the received signals;
a generator configured to generate channel estimates from the despread user signals;
a restoring unit configured to restore user signals based on the channel estimates to generate restored user signals; and
a combining unit configured to combine restored user signals to generate a restored signal to be detected,
wherein the weighting unit is further configured to direct a weighting proportional to the antenna-specific reception power to one or more of the following signals: a spread signal to be detected, despread user signals, user-specific channel estimates, restored user signals, a restored signal to be detected.
23. An apparatus, comprising:
receiving means for receiving a signal including signal components descriptive of a signal to be detected and an interfering signal;
measuring means for measuring an reception power of the received signal; and
weighting means for weighting the signal received in the receiving means by a antenna-specific weighting coefficient proportional to the reception power of said signal,
wherein the antenna-specific weighting coefficient is the reciprocal of the reception power of the signal received in said receiving means.
24. The apparatus as claimed in claim 23 , wherein the weighting means is configured for weighting the received signal time-dependently by the weighting coefficient proportional to the reception power of the signal.
25. An apparatus, comprising:
receiving means for receiving a signal including signal components descriptive of a signal to be detected and an interfering signal;
measuring means for measuring an antenna-specific reception power of the received signal;
weighting means for weighting the signal received in the receivers by a antenna-specific weighting coefficient proportional to the reception power of said signal;
dispreading means for despreading user signals from the received signals;
generating means for generating channel estimates from the despread user signals;
restoring means for restoring user signals based on the channel estimates to generate restored user signals; and
combining means for combining restored user signals to generate a restored signal to be detected,
wherein the weighting means is further configured to direct a weighting proportional to the antenna-specific reception power to one or more of the following signals: a spread signal to be detected, despread user signals, user-specific channel estimates, restored user signals, a restored signal to be detected.