Interference estimation for wireless communication
First Claim
Patent Images
1. A method of wireless communication in a wireless network, the method comprising:
- computing a first interference estimate based on common reference signal tones;
computing a second interference estimate based on data tones by;
estimating a traffic-to-pilot ratio over data tones of colliding interferers, andcomputing an interference estimate based on the traffic-to-pilot ratio;
selecting one of the first interference estimate or the second interference estimate based on a reliability determination of the first interference estimate and the second interference estimate;
performing a soft cancellation of data transmitted by a serving cell at a symbol level or at a codeword level; and
estimating the traffic-to-pilot ratio of colliding interferers after cancellation of the data transmitted by the serving cell.
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Abstract
Interference on pilot signals and on data tones can be mismatched. Different types of interference estimates perform differently based on how the mismatch occurs. The resulting interference estimate may thus be inaccurate. Interference estimates based on pilot signals and also on data tones can both be evaluated for reliability. The more reliable of the two can then be selected. If the data tones estimate is selected, the estimate can be calculated from covariance matrices or from traffic-to-pilot ratios.
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Citations
28 Claims
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1. A method of wireless communication in a wireless network, the method comprising:
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computing a first interference estimate based on common reference signal tones; computing a second interference estimate based on data tones by; estimating a traffic-to-pilot ratio over data tones of colliding interferers, and computing an interference estimate based on the traffic-to-pilot ratio; selecting one of the first interference estimate or the second interference estimate based on a reliability determination of the first interference estimate and the second interference estimate; performing a soft cancellation of data transmitted by a serving cell at a symbol level or at a codeword level; and estimating the traffic-to-pilot ratio of colliding interferers after cancellation of the data transmitted by the serving cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus for wireless communication, comprising:
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means for computing a first interference estimate based on common reference signal tones; means for computing a second interference estimate based on data tones by; estimating a traffic-to-pilot ratio over data tones of colliding interferers, and computing an interference estimate based on the traffic-to-pilot ratio; means for selecting one of the first interference estimate or the second interference estimate based on a reliability determination of the first interference estimate and the second interference estimate; means for performing a soft cancellation of data transmitted by a serving cell at a symbol level or at a codeword level; and means for estimating the traffic-to-pilot ratio of colliding interferers after cancellation of the data transmitted by the serving cell.
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15. A computer program product for wireless communications, the computer program product comprising:
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a non-transitory computer-readable medium having program code recorded thereon, the program code comprising; program code to compute a first interference estimate based on common reference signal tones; program code to compute a second interference estimate based on data tones by; estimating a traffic-to-pilot ratio over data tones of colliding interferers, and computing an interference estimate based on the traffic-to-pilot ratio; program code to select one of the first interference estimate or the second interference estimate based on a reliability determination of the first interference estimate and the second interference estimate; program code to perform a soft cancellation of data transmitted by a serving cell at a symbol level or at a codeword level; and program code to estimate the traffic-to-pilot ratio of colliding interferers after cancellation of the data transmitted by the serving cell.
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16. An apparatus for wireless communications, comprising:
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a memory; and at least one processor coupled to the memory, the at least one processor being configured; to compute a first interference estimate based on common reference signal tones; to compute a second interference estimate based on data tones by; estimating a traffic-to-pilot ratio over data tones of colliding interferers, and computing an interference estimate based on the traffic-to-pilot ratio; to select one of the first interference estimate or the second interference estimate based on a reliability determination of the first interference estimate and the second interference estimate; to perform a soft cancellation of data transmitted by a serving cell at a symbol level or at a codeword level; and to estimate the traffic-to-pilot ratio of colliding interferers after cancellation of the data transmitted by the serving cell. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification