Systems and methods for control of receivers
A controller for advanced receivers configures a plurality of advanced receiver modules based on figures of merit computed on the input signal. The controller also selects the appropriate output signal based on figures of merit of either the input or the output signals. The controller decisions can also be made in a bursty manner, where only a subset of the decisions to be made are made at a given time, thereby limiting the processing load of the control processor.
1. A receiver for signal processing in a mobile station, comprising:
a front-end processor for receiving a signal;
a searcher coupled to the front-end processor for detecting one or more signal paths in the signal;
a selection module for selecting at least one of the one or more signal paths and selecting at least one of a plurality of available sectors for use in interference cancellation or equalization;
a symbol estimator coupled to the selection module for generating one or more symbol estimates from at least one of the one or more signal paths; and
a receiver module coupled to the symbol estimator for generating a substantially interference cancelled signal;
wherein each of the at least one of the plurality of available sectors continues to be used for symbol estimation unless at least one of an override threshold and a time of override is satisfied.
2. The receiver of claim 1 , wherein the selection module selects the one or more signal paths based at least in part on the strength of the one or more signal paths.
3. The receiver of claim 1 , wherein the selection module selects the one or more signal paths sequentially.
4. The receiver of claim 1 , wherein the selection module selects the one or more signal paths in parallel.
5. The receiver of claim 1 , further comprising:
one or more processing modules each for operating on one or more signal paths to produce one or more output signal streams;
wherein the selection module is coupled to the one or more processing modules for selecting at least one of the output signal streams as at least one selected output signal stream; and
wherein the symbol estimator is configured for producing one or more symbol estimates from the at least one selected output signal stream.
6. The receiver of claim 5 , wherein at least one of the one or more processing modules is a selected one of an equalizer and an interference canceller.
7. The receiver of claim 5 , wherein the selection module selects at least one of the output signal streams as at least one selected output signal stream at least in part based on a figure of merit of at least one of an output signal stream and an input signal stream.
8. The receiver of claim 1 , further comprising a signal metric evaluator coupled to the front-end processor for generating one or more signal metrics.
9. The receiver of claim 8 , wherein the one or more signal metrics comprises at least one of strength, traffic statistics and geometry.
10. The receiver of claim 8 , wherein the front end processor is further configured for selecting a receiver technique for processing the one or more signal paths based at least in part on at least one of the one or more signal metrics and wherein the receiver technique is chosen from Rake, equalizer and interference canceller.
11. The receiver of claim 1 , further comprising a sector path list, and wherein the selection module selects the at least one of the plurality of available sectors from the sector path list.
12. The receiver of claim 11 , wherein the selection module compares a strongest sector path list candidate to a weakest sector in the sector path list and replaces the weakest sector on the sector path list with the strongest sector path list candidate if the strength of the strongest sector path list candidate is greater than the strength of the weakest sector.
13. The receiver of claim 12 , wherein the selection module replaces the weakest sector on the sector path list with the strongest sector path list candidate if the strength of the strongest sector path list candidate is greater than the strength of the weakest sector for a time threshold.
14. A method for signal processing in a mobile station, comprising:
receiving a signal in a receiver;
detecting one or more signal paths in the signal;
selecting at least one of the one or more signal paths and selecting at least one of a plurality of available sectors for use in interference cancellation or equalization;
generating one or more symbol estimates from at least one of the one or more selected signal paths; and
generating a substantially interference cancelled signal from the one or more symbol estimates;
wherein each of the at least one of the plurality of available sectors continues to be used for symbol estimation unless at least one of an override threshold and a time of override is satisfied.
15. The method of claim 14 , wherein the one or more signal paths is selected based at least in part on the strength of the one or more signal paths.
16. The method of claim 14 , further comprising generating one or more signal metrics, wherein the one or more signal metrics comprises at least one of strength, traffic statistics and geometry.
17. The method of claim 16 , further comprising selecting a receiver technique for processing the one or more signal paths based at least in part on at least one of the one or more signal metrics.
18. The method of claim 17 , wherein the receiver technique is chosen from Rake, equalizer and interference canceller.