Method of and system for path selection in rich multipath conditions
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorAndres Reial
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Abstract
A signal-path-selection method in a RAKE receiver includes producing C channel estimates from M received signal paths, determining a plurality of best signal paths using the C produced channel estimates, choosing A signal paths of the plurality of best signal paths in accordance with at least one pre-determined criterion, and combining the A signal paths. C is a measure of channel-estimation capacity of the RAKE receiver. M is greater than C. This Abstract is provided to comply with rules requiring an Abstract that allows a searcher or other reader to quickly ascertain subject matter of the technical disclosure. This Abstract is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b).
Claims20
A signal-path-selection method in a RAKE receiver, the method comprising:
- producing C channel estimates from M received signal paths;
- determining a plurality of best signal paths using the C produced channel estimates further comprising updating a previously-determined list of the plurality of best signal paths by merging the C produced channel estimates into the previously-determined list of the plurality of best signal paths;
- choosing A signal paths of the plurality of best signal paths in accordance with at least one pre-determined criterion;
- combining the A signal paths;
- wherein C is a measure of channel-estimation capacity of the RAKE receiver;
- and
- wherein M is greater than C.
A signal-path-selection method in a RAKE receiver, the method comprising:
- producing C channel estimates from M received signal paths;
- determining a plurality of best signal paths using the C produced channel estimates;
- choosing A signal paths of the plurality of best signal paths in accordance with at least one pre-determined criterion;
- combining the A signal paths;
- wherein C is a measure of channel-estimation capacity of the RAKE receiver;
- wherein M is greater than C;
- wherein the producing, determining, choosing, and combining steps are performed once per every R time units;
- and
- wherein R=M/C.
The signal-path-selection method of 1, further comprising:
- performing the producing, determining, choosing, and combining steps once per every R time units;
- and
- wherein R is selected so that channel estimates for momentarily-strongest paths that contribute most to a signal-to-interference ratio are updated more frequently than other channel estimates.
A signal-path-selection method in a RAKE receiver, the method comprising:
- assigning a group of Cfrequent channel-estimation hardware units to at least one relatively-strong signal path;
- assigning a group of Cinfrequent channel-estimation hardware units to at least one relatively-weak signal path, wherein Cfrequent plus Cinfrequent equals C,
- producing C channel estimates from M received signal paths, wherein C is a measure of channel-estimation capacity of the RAKE receiver and M is greater than C;
- determining a plurality of best signal paths using the C produced channel estimates;
- choosing A signal paths of the plurality of best signal paths in accordance with at least one pre-determined criterion;
- and
- combining the A signal paths;
- wherein the producing, determining, choosing, and combining steps are performed according to an independent resource-sharing scheme for each of the groups of Cfrequent and Cinfrequent channel-estimation hardware units.
A RAKE receiver comprising:
- a channel estimator for producing C channel estimates from M received signal paths, wherein C is a measure of channel-estimation capacity of the RAKE receiver;
- and M is greater than C;
- a RAKE combiner for choosing A signal paths of a plurality of determined best signal paths and combining the A chosen signal paths;
- and
- logic for updating a previously-determined list of the plurality of best signal paths by merging the C produced channel estimates into the previously-determined list of the plurality of best signal paths.
A RAKE receiver comprising:
- a channel estimator for producing C channel estimates from M received signal paths, wherein C is a measure of channel-estimation capacity of the RAKE receiver;
- and M is greater than C;
- and
- a RAKE combiner for choosing A signal paths of a plurality of determined best signal paths and combining the A chosen signal paths;
- wherein the RAKE receiver is adapted to produce the C channel estimates and choose and combine the A signal once per every R time units;
- and
- R=M/C.
A RAKE receiver comprising:
- a channel estimator for producing C channel estimates from M received signal paths, wherein C is a measure of channel-estimation capacity of the RAKE receiver;
- and M is greater than C;
- a RAKE combiner for choosing A signal paths of a plurality of determined best signal paths and combining the A chosen signal paths;
- and
- logic for assigning a group of Cfrequent channel-estimation hardware units to at least one relatively-strong signal path;
- logic for assigning a group of Cinfrequent channel-estimation hardware units to at least one relatively-weak signal path;
- wherein the channel estimator comprises C channel-estimation hardware units;
- wherein the RAKE receiver is adapted to produce channel estimates and choose and combine signal paths according to an independent resource-sharing scheme for each of the groups of Cfrequent and Cinfrequent channel-estimation hardware units;
- and
- wherein Cfrequent plus Cinfrequent equals C.
An article of manufacture for performing signal-path-selection in a RAKE receiver, the article of manufacture comprising:
- at least one computer readable medium;
- processor instructions contained on the at least one computer readable medium, the processor instructions configured to be readable from the at least one computer readable medium by at least one processor and thereby cause the at least one processor to operate as to:
- produce C channel estimates from M received signal paths;
- determine a plurality of best signal paths using the C produced channel estimates by updating a previously-determined list of the plurality of best signal paths;
- choose A signal paths of the plurality of best signal paths in accordance with at least one pre-determined criterion;
- and
- combine the A signal paths;
- and
- wherein C is a measure of channel-estimation capacity of the RAKE receiver;
- and
- wherein M is greater than C;
- wherein the updating a previously-determined list of the plurality of best signal paths is performed by merging the C produced channel estimates into the previously-determined list of the plurality of best signal paths.
Dependencies are inferred from the claim text.