Cell detection with interference cancellation
First Claim
1. A method of detecting for cells in a wireless communication network, comprising:
- obtaining a received signal comprising pilots transmitted by a plurality of cells in the wireless network; and
processing the received signal with interference cancellation to detect for the pilots, wherein the processing of the received signal comprises performing pilot detection and interference cancellation of the received signal in multiple stages, each stage of the multiple stages comprising;
detecting one or more pilots from one or more cells from the plurality of cells;
selecting at least one cell for interference cancellation from the one or more cells based in part on the one or more pilots;
deriving at least one channel estimate for the at least one selected cell;
generating at least one pilot for the at least one selected cell;
estimating interference due to the at least one selected cell based on the at least one generated pilot and the at least one channel estimate; and
canceling interference due to the at least one selected cell from the received signal based on the estimated interference.
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Accused Products
Abstract
Techniques for performing cell detection with interference cancellation are described. In an aspect, a user equipment (UE) may detect for pilots from cells in a wireless network using interference cancellation. The UE may process a received signal to detect for pilots from one or more cells. The pilots may be common pilots transmitted with a reuse factor of one or low reuse pilots transmitted with a reuse factor greater than one. The UE may estimate the interference from a detected cell (e.g., the strongest detected cell) and may cancel the estimated interference from the received signal. The UE may then process the interference-canceled signal to detect for pilots from additional cells. The UE may be able to detect pilots from more cells, e.g., from weaker cells, by canceling the interference due to the pilots from the detected cells. This may be desirable for various applications such as positioning.
256 Citations
20 Claims
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1. A method of detecting for cells in a wireless communication network, comprising:
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obtaining a received signal comprising pilots transmitted by a plurality of cells in the wireless network; and processing the received signal with interference cancellation to detect for the pilots, wherein the processing of the received signal comprises performing pilot detection and interference cancellation of the received signal in multiple stages, each stage of the multiple stages comprising; detecting one or more pilots from one or more cells from the plurality of cells; selecting at least one cell for interference cancellation from the one or more cells based in part on the one or more pilots; deriving at least one channel estimate for the at least one selected cell; generating at least one pilot for the at least one selected cell; estimating interference due to the at least one selected cell based on the at least one generated pilot and the at least one channel estimate; and canceling interference due to the at least one selected cell from the received signal based on the estimated interference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for wireless communication, comprising:
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means for obtaining a received signal comprising pilots transmitted by a plurality of cells; and means for processing the received signal with interference cancellation to detect for the pilots, including; means for performing pilot detection and interference cancellation in multiple stages in the received signal, wherein, for each stage of the multiple stages, the means for performing pilot detection and interference cancellation; detects one or more pilots from one or more cells from the plurality of cells, selects at least one cell from the one or more cells based in part on the one or more pilots, derives at least one channel estimate for the at least one selected cell, generates at least one pilot for the at least one selected cell estimates interference due to the at least one selected cell based on the at least one generated pilot and the at least one channel estimate, and cancels interference due to the at least one selected cell from the received signal based on the estimated interference. - View Dependent Claims (12, 13, 14)
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15. An apparatus for wireless communication, comprising:
at least one processor configured to; obtain a received signal comprising pilots transmitted by a plurality of cells in a wireless communication network; and process the received signal to detect for the pilots from the plurality of cells at least in part by performing pilot detection and interference cancellation in multiple stages, and for each stage of the multiple stages; detecting one or more pilots in the received signal from one or more cells from the plurality of cells, selecting at least one cell from the one or more cells based in part on the one or more pilots, deriving a at least one channel estimate for the at least one selected cell, generating at least one pilot for the at least one selected cell, estimating interference due to the at least one selected cell based on the at least one generated pilot and the at least one channel estimate, and canceling interference due to the at least one selected cell from the received signal based on the estimated interference. - View Dependent Claims (16, 17, 18)
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19. A computer program product, stored on a non-transitory computer-readable medium, comprising code for causing at least one computer to:
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obtain a received signal comprising pilots transmitted by a plurality of cells in a wireless communication network, and process the received signal to detect for the pilots from the plurality of cells at least in part by performing pilot detection and interference cancellation in multiple stages, and for each stage of the multiple stages; detecting one or more pilots from one or more cells from the plurality of cells, selecting at least one cell for interference cancellation from among the one or more cells, deriving at least one channel estimate for the at least one selected cell; generating at least one pilot for the at least one selected cell; estimating interference due to the at least one selected cell based on the at least one generated pilot and the at least one channel estimate; and canceling interference due to the at least one selected cell based on the estimated interference. - View Dependent Claims (20)
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Specification