Method and apparatus for finger placement in rake receiver
First Claim
1. A method of finger placement in a RAKE receiver comprising:
- receiving a composite signal that includes one or more signal images;
generating a multipath delay profile for the composite signal over a defined search window at a first delay resolution; and
determining delay assignments for placement of one or more fingers of the RAKE receiver within the search window based on a second delay resolution that is independent of the first delay resolution by determining which grid points in a finger placement grid comprising a plurality of grid points uniformly spaced according to the second delay resolution most closely coincide with one or more strongest measurements in the multipath delay profile.
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0 Petitions
Accused Products
Abstract
A receiver based on a RAKE receiver architecture includes a logic circuit configured to assign one or more RAKE fingers to a finger placement grid that is independent from a searcher delay grid used by the receiver'"'"'s searcher in generating multipath delay profiles for received signals. The logic circuit may use the multipath delay profile to “tune” the finger placement grid relative to the searcher delay grid but the delay resolution of the finger placement grid is independent of the searcher delay grid. This independence permits, for example, setting the finger placement grid to a delay resolution based on a Nyquist criterion independently from the delay resolution used by the searcher. The receiver may use two or more finger placement grids, may operate in a mixed mode where fingers are assigned on- and off-grid, and may operate selectively in grid or non-grid modes.
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Citations
91 Claims
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1. A method of finger placement in a RAKE receiver comprising:
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receiving a composite signal that includes one or more signal images; generating a multipath delay profile for the composite signal over a defined search window at a first delay resolution; and determining delay assignments for placement of one or more fingers of the RAKE receiver within the search window based on a second delay resolution that is independent of the first delay resolution by determining which grid points in a finger placement grid comprising a plurality of grid points uniformly spaced according to the second delay resolution most closely coincide with one or more strongest measurements in the multipath delay profile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of finger placement in a RAKE receiver comprising:
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receiving a composite signal that includes one or more signal images; generating a multipath delay profile for the composite signal based on a searcher delay grid defined within a search window, the searcher delay grid having a searcher grid resolution; defining a finger placement grid for positioning fingers of the RAKE receiver within the search window, the finger placement grid having a placement grid resolution that differs from the searcher grid resolution and is coarser than a base resolution for the RAKE receiver; and placing at least one finger of the RAKE receiver on a grid point of the finger placement grid based on evaluating the multipath delay profile. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A receiver comprising:
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a searcher to generate a multipath delay profile based on a searcher delay grid for a received signal that includes one or more signal images, the searcher delay grid having a searcher grid resolution; a RAKE receiver to generate a despread signal by despreading the received signal, the RAKE receiver comprising; a plurality of fingers to despread received signals at different signal delays; and a logic circuit to assign one or more fingers of the RAKE receiver to grid points of one or more finger placement grids based on the multipath delay profile, said one or more finger placement grids each having a placement grid resolution that differs from the searcher grid resolution and is coarser than a base resolution for the RAKE receiver. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69)
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70. A computer-readable medium encoded with program instructions to instruct a processor for a RAKE receiver to:
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evaluate a multipath delay profile comprising a plurality of measurement values for a received signal taken at corresponding measurement points on a searcher delay grid having a searcher grid resolution; define a finger placement grid comprising a plurality of grid points that span at least a portion of the multipath delay profile the finger placement grid having a placement grid resolution that differs from the searcher grid resolution and is coarser than a base resolution for the RAKE receiver; and determine delay assignments for one or more fingers of a RAKE receiver corresponding to one or more selected grid points of the finger placement grid based on evaluating the multipath delay profile. - View Dependent Claims (71, 72, 73, 74, 75)
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76. A mobile terminal comprising:
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a transmitter to transmit wireless signals; and a receiver to receive wireless signals, said receiver comprising a RAKE receiver configured to; generate a finger placement grid that is independent of a searcher grid used to generate a multipath delay profile for a received signal; evaluate one or more grid points of the finger placement grid based on the multipath delay profile to identify one or more selected grid points of the finger placement grid; and assign delay settings of one or more fingers of the RAKE receiver corresponding to the one or more selected grid points. - View Dependent Claims (77, 78, 79, 80, 81, 82, 83)
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84. A base station comprising:
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a transmitter to transmit wireless signals; and a receiver to receive wireless signals, said receiver comprising a RAKE receiver configured to; define a finger placement grid for placement of one or more fingers of the RAKE receiver that is independent of a searcher grid used to generate a multipath delay profile for a received signal, the searcher grid having a searcher grid resolution and the finger placement grid having a placement grid resolution that differs from the searcher grid resolution and is coarser than a base resolution for the RAKE receiver; identify one or more selected grid points by evaluating grid points of the finger placement grid based on the multipath delay profile; and assign delay settings corresponding to the selected grid points to one or more of the fingers of the RAKE receiver. - View Dependent Claims (85, 86, 87, 88, 89, 90, 91)
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Specification