MULTI-PATH TIMING TRACKING AND IMPAIRMENT MODELING FOR IMPROVED GRAKE RECEIVER PERFORMANCE IN MOBILITY SCENARIOS
First Claim
1. A method of estimating a propagation channel response corresponding to a received signal in a wireless communication receiver, the method comprising:
- selecting a plurality of receiver processing delays for sampling the received signal so that that the receiver processing delays span two closely spaced channel response delays;
calculating an average channel coefficient magnitude over at least a first number of time slots of the received signal, for each of the receiver processing delays;
estimating delay timing for each of the two channel response delays, based on the average channel coefficient magnitudes and a multi-delay superposition model for the channel response; and
calculating complex channel gains for each of the two channel response delays, based on the estimated delay timings and channel response measurements taken over a second number of time slots that is less than the first number of time slots.
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Accused Products
Abstract
Methods and wireless receivers (5) are disclosed for estimating a propagation channel response that includes two closely spaced delays. An exemplary method comprises selecting (720) a plurality of receiver processing delays for sampling the received signal so that that the receiver processing delays span two closely spaced channel response delays, and calculating (730) an average channel coefficient magnitude over at least a first number of time slots of the received signal, for each of the receiver processing delays. The exemplary method further comprises estimating (740) delay timing for each of the two channel response delays, based on the average channel coefficient magnitudes and a multi-delay superposition model for the channel response, and calculating (750) complex channel gains for each of the two channel response delays, based on the estimated delay timings and channel response measurements taken over a second number of time slots that is less than the first number of time slots.
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Citations
22 Claims
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1. A method of estimating a propagation channel response corresponding to a received signal in a wireless communication receiver, the method comprising:
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selecting a plurality of receiver processing delays for sampling the received signal so that that the receiver processing delays span two closely spaced channel response delays; calculating an average channel coefficient magnitude over at least a first number of time slots of the received signal, for each of the receiver processing delays; estimating delay timing for each of the two channel response delays, based on the average channel coefficient magnitudes and a multi-delay superposition model for the channel response; and calculating complex channel gains for each of the two channel response delays, based on the estimated delay timings and channel response measurements taken over a second number of time slots that is less than the first number of time slots. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wireless communication receiver comprising:
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a receiver front-end circuit and one or more processing circuits, configured to; select a plurality of receiver processing delays for sampling a received signal so that the receiver processing delays span two closely spaced channel response delays; calculate an average channel coefficient magnitude over at least a first number of time slots of the received signal, for each of the receiver processing delays; estimate delay timing for each of the two channel response delays, based on the average channel coefficient magnitudes and a multi-delay superposition model for the channel response; and calculate complex channel gains for each of the two channel response delays, based on the estimated delay timings and channel response measurements taken over a second number of time slots that is less than the first number of time slots. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of evaluating a propagation channel response corresponding to a received signal in a wireless receiver, the method comprising:
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calculating estimated net channel coefficients for a plurality of time slots of the received signal, using a single-path channel model for a reported propagation response delay; computing a plurality of error metrics based on the estimated net channel coefficients and corresponding channel response measurements taken over the time slots; and detecting that two or more closely spaced channel response delays are present in the propagation channel response by determining that a variance of the error metrics exceeds a pre-determined threshold. - View Dependent Claims (20)
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21. A wireless communication receiver comprising:
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a receiver front-end circuit and one or more processing circuits the processing circuits being configured to; calculate estimated net channel coefficients for a plurality of time slots of a received signal, using a single-path channel model for a reported propagation response delay; compute a plurality of error metrics based on the estimated net channel coefficients and corresponding channel response measurements taken over the time slots; and detect that two or more closely spaced channel response delays are present in a propagation channel response corresponding to the received signal by determining that a variance of the error metrics exceeds a pre-determined threshold. - View Dependent Claims (22)
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Specification