Method and system for interference suppression using information from non-listened base stations
View Patent ↗Aspects of a method and system for interference suppression using information from non-listened base stations are provided. A wireless communication device may be operable to receive a raw signal comprising one or more desired signals from one or more serving base transceiver stations (BTSs) and comprising one or more undesired signals from one or more non-listened BTSs. The wireless communication device may be operable to generate first estimate signals that estimate the one or more undesired signals as transmitted by the one or more non-listened BTSs, generate an interference suppressed version of the raw signal based on the first estimate signals, and recover the one or more desired signals from the interference suppressed version of the raw signal. The non-listened BTSs may comprise one or more BTSs that are not serving the wireless communication device and are not involved in a hand off of the wireless communication device.
1. A wireless communication device, comprising:
a receiver configured to receive a signal including a plurality of multipath component signals that correspond to a plurality of source-specific signals from at least one listened base transceiver station (BTS) and at least one non-listened BTS;
an interference cancellation module configured to separately process the plurality of multipath component signals according to signal source information associated with the plurality of source-specific signals, and utilizing a plurality of interference cancellation parameters to provide an interference suppressed signal; and
a processor configured to generate the plurality of interference cancellation parameters corresponding to the plurality of multipath component signals;
wherein the signal source information comprises one of:
a rake finger channel estimate or timing:
a scaling factor; or
a scrambling code.
2. The wireless communication device of claim 1 , wherein the interference cancellation module is further configured to utilize a plurality of weighting factor values that are based on the plurality of interference cancellation parameters and a plurality of signal metrics corresponding to the plurality of multipath component signals to provide the interference suppressed signal.
3. The wireless communication device of claim 2 , wherein the plurality of signal metrics comprise:
a signal power level or a noise power level of each multipath component signal from among the plurality of multipath component signals.
4. The wireless communication device of claim 1 , wherein the interference cancellation module is further configured to allocate the plurality of multipath component signals for separate processing according to a pseudo-noise (PN) sequence or an orthogonal variable spreading factor (OVSF) code.
5. The wireless communication device of claim 1 ,
wherein the interference cancellation module is further configured to compute a plurality of weighting factor values corresponding to the plurality of source-specific signals utilizing the plurality of interference cancellation parameters to provide the interference suppressed signal.
6. The wireless communication device of claim 5 , wherein the interference cancellation nodule is further configured to compute the plurality of weighting factor values utilizing a signal power level or a noise power level corresponding to each multipath component signal from among the plurality of multipath component signals.
7. The wireless communication device of claim 1 ,
wherein the processor is further configured to generate the plurality of interference cancellation parameters by selecting the plurality of interference cancellation parameters from a memory.
8. A wireless communication device, comprising:
a receiver configured to receive a signal including a plurality of multipath component signals that correspond to a plurality of source-specific signals from at least one listened base transceiver station (BTS) and at least one non-listened BTS;
an interference cancellation module configured to separately process the plurality of multipath component signals according to signal source information associated with the plurality of source-specific signals, and utilizing a plurality of interference cancellation parameters to provide an interference suppressed signal; and
a processor configured to generate the plurality of interference cancellation parameters corresponding to the plurality of multipath component signals;
wherein the processor is further configured to compute a plurality of channel estimate values utilizing information within the plurality of multipath component signals and to apply a rake receiver weighting corresponding to the plurality of multipath component signals to the plurality of channel estimate values to compute the plurality of interference cancellation parameters.
9. A wireless communication device, comprising:
a rake receiver configured to provide signal source information corresponding to a plurality of multipath component signals that constitute a received signal;
a processor configured to generate a plurality of interference cancellation parameters corresponding to the plurality of multipath component signals:
an interference cancellation module configured to separately process the plurality of multipath component signals according to the s gnal source information utilizing the plurality of interference cancellation parameters to provide a plurality of estimated interference signals;
an interpolator configured to provide a plurality of interpolated estimated interference signals based on the plurality of estimated interference signals; and
a subtractor configured to subtract the plurality of interpolated estimated interference signals from the received signal to provide an interference suppressed version of the received signal.
10. The wireless communication device of claim 9 , wherein the signal source information comprises:
a rake finger channel estimate or timing;
a scaling factor; or
a scrambling code.
11. The wireless communication device of claim 10 , wherein the received signal comprises:
a plurality of listened or non-listened base-transceiver station (BTS) component signals,
wherein the scrambling code corresponds to a listened or a non-listened BTS.
12. The wireless communication device of claim 9 , wherein the plurality of multipath component signals comprise:
a plurality of listened or non-listened base-transceiver station (BTS) component signals,
wherein the plurality of estimated interference signals represent an estimate of the plurality of non-listened BTS component signals.
13. The wireless communication device of claim 9 , further comprising:
a buffer configured to store the received signal,
wherein the subtractor is further configured to subtract the plurality of interpolated estimated interference signals from the received signal stored in the buffer to provide the interference suppressed version of the received signal.
14. The wireless communication device of claim 9 , wherein the rake receiver is further configured to provide the signal source information according to a pseudo-noise (PN) sequence or an orthogonal variable spreading factor (OVSF) code.
15. A method for signal processing in a wireless communication device, comprising:
allocating a plurality of multipath component signals that constitute a received signal to separate processing modules according to a source of the plurality of multipath component signals;
weighting the plurality of multipath component signals according to a plurality of respective signal metrics to generate an estimated component signal of the received signal; and
subtracting the estimated component signal from the received signal to generate an interference suppressed version of the received signal.
16. The method of claim 15 , wherein the plurality of multipath component signals comprise:
a plurality of listened or non-listened base-transceiver station (BTS) component signals.
17. The method of claim 16 , wherein the allocating comprises:
allocating the plurality of multipath component signals to separate processing modules according to a pseudo-noise (PN) sequence or an orthogonal variable spreading factor (OVSF) code of the listened or non-listened BTS component signals.
18. The method of claim 16 , wherein the estimated component signal is an interference signal estimate of a non-listened BTS component signal from among the plurality of non-listened BTS component signals.
19. The method of claim 15 , wherein the plurality of respective signal metrics comprise:
a signal power level or a noise power level of each multipath component signal from among the plurality of multipath component signals.
20. A wireless communication device, comprising:
a receiver configured to receive a plurality of multipath signals that constitute a received signal generated from a plurality of base transceiver stations;
an interference cancellation module comprising a plurality of processing modules, wherein a first processing module is configured to process a first subset of the multipath signals that are generated from a first base transceiver station of the plurality of base transceiver stations, and to utilize a scrambling code corresponding to the first base transceiver station to generate a first estimated component signal of the received signal corresponding to the first base transceiver station; and
a subtractor configured to subtract the first estimated component signal from the received signal to provide an interference suppressed version of the received signal.