Methods and apparatus for determining timing in a wireless communication system
First Claim
1. A method for setting timing of sampling of one or more symbols comprising:
- calculating with a timing circuit the total effective interference occurring during a sampling period;
determining with the timing circuit a minimum of the calculated total effective interference occurring during the sampling period; and
setting with the timing circuit a start of the timing of sampling of the symbol based on the determined minimum of the total effective interference, wherein the total effective interference includes inter-symbol interference, channel estimation loss and inter-carrier interference.
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Abstract
Methods and apparatus for setting timing of sampling of one or more symbols. The disclosed methods account for at least three types of effective interference (EI) and are used to set the timing of a sampling window for sampling received symbols. The methods includes setting timing based on determining an energy density function accounting for both static and dynamic EI, determining the minimum of a total energy profile and sliding the sampling window to ensure that the minimum point is at a predetermined point, and determining and using a composite energy profile accounting for short term and long term fading effects. The disclosed apparatus include a transceiver employing one or more of the disclosed methods for setting timing when receiving the symbols.
77 Citations
60 Claims
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1. A method for setting timing of sampling of one or more symbols comprising:
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calculating with a timing circuit the total effective interference occurring during a sampling period; determining with the timing circuit a minimum of the calculated total effective interference occurring during the sampling period; and setting with the timing circuit a start of the timing of sampling of the symbol based on the determined minimum of the total effective interference, wherein the total effective interference includes inter-symbol interference, channel estimation loss and inter-carrier interference. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for setting timing of sampling of one or more symbols comprising:
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determining with a timing circuit an energy density profile of effective interference occurring in at least one symbol based on static effective interference and a probability of the occurrence of dynamic effective interference resulting from a dynamic behavior of a channel, wherein the effective interference includes inter-symbol interference, channel estimation loss and inter-carrier interference; and setting with the timing circuit a start of timing of sampling of the symbol based on the determined energy density profile. - View Dependent Claims (8, 9, 10, 11)
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12. A method for setting timing of sampling of one or more symbols comprising:
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calculating with a timing circuit a composite energy profile of the at least one symbol based on an estimated channel energy profile including a summation of a short term channel energy profile and a long term channel energy profile, wherein the composite energy profile includes energy inter-symbol interference, channel estimation loss and inter-carrier interference; and setting with the timing circuit a start of timing of sampling of the at least one symbol based on the composite energy profile. - View Dependent Claims (13, 14, 15, 16)
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17. A transceiver for use in a wireless communication system comprising:
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a sampler configured to sample a received input signal at a set timing offset, wherein the set timing offset is based on a timing information provided with a timing circuit; a channel estimator configured to receive the input signal from the sampler and compute an impulse response; and the timing circuit configured to receive the computed impulse response for a symbol from the channel estimator, determine the timing information based on at least one of a computed effective interference (EI) density function accounting for static and dynamic EI, a sliding adjustment based on a calculated minimum total energy of the symbol, or a composite channel energy profile accounting for long and short term channel fading effects, and provide the timing information to the sampler, wherein the calculated minimum total energy of the symbol includes energy from inter-symbol interference, channel estimation loss and inter-carrier interference. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An apparatus for setting timing of sampling of one or more symbols in a wireless communication device comprising:
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means for calculating the total effective interference occurring during a sampling period; means for determining a minimum of the calculated total effective interference occurring during the sampling period; and means for setting a start of timing of sampling of a next sample of the one or more symbols based on the determined minimum of the total effective interference, wherein the total effective interference includes inter-symbol interference, channel estimation loss and inter-carrier interference, and the start of timing of the next sample relative to a current sample is based on a sign of the determined minimum. - View Dependent Claims (30, 31, 32, 33, 34)
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35. An apparatus for setting timing of sampling of one or more symbols in a wireless device comprising:
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means for determining an energy density profile of effective interference occurring in at least one symbol based on static effective interference and a probability of the occurrence of dynamic effective interference resulting from a dynamic behavior of a channel, wherein the means for determining is configured to utilize a known channel symbol profile; and means for setting a start of timing of sampling of the symbol based on the determined energy density profile. - View Dependent Claims (36, 37, 38, 39)
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40. An apparatus for setting timing of sampling of one or more symbols in a wireless device comprising:
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means for determining short and long term profiles by low-pass filtering an estimated channel energy profile of at least one symbol; means for calculating a composite energy profile of the at least one symbol based on the estimated channel energy profile including a summation of the short term channel energy profile and the long term channel energy profile, the composite energy profile includes energy from inter- symbol interference, channel estimation loss and inter-carrier interference; and means for setting a start of timing of sampling of the at least one symbol based on the composite energy profile. - View Dependent Claims (41, 42, 43, 44)
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45. A non-transitory machine readable medium embodying instructions that, when executed by a processor, allow the processor to perform a method that sets timing of sampling of one or more symbols, the method comprising:
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calculating the total effective interference occurring during a sampling period; determining a minimum of the calculated total effective interference occurring during the sampling period; and setting a start of timing of sampling of the symbol based on the determined minimum of the total effective interference, wherein the total effective interference includes inter-symbol interference, channel estimation loss and inter-carrier interference. - View Dependent Claims (46, 47, 48, 49, 50)
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51. A non-transitory machine readable medium embodying instructions that, when executed by a processor, allow the processor to perform a method that sets timing of sampling of one or more symbols, the method comprising:
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determining an energy density profile of effective interference occurring in at least one symbol based on static effective interference and a probability of the occurrence of dynamic effective interference resulting from a dynamic behavior of a channel, wherein the effective interference includes inter-symbol interference, channel estimation loss and inter-carrier interference; and setting a start of timing of sampling of the symbol based on the determined energy density profile. - View Dependent Claims (52, 53, 54, 55)
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56. A non-transitory machine readable medium embodying instructions that, when executed by a processor, allow the processor to perform a method that sets timing of sampling of one or more symbols, the method comprising:
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calculating a composite energy profile of the at least one symbol based on an estimated channel energy profile including a summation of a short term channel energy profile and a long term channel energy profile, wherein the composite energy profile includes energy inter-symbol interference, channel estimation loss and inter-carrier interference; and setting a start of timing of sampling of the at least one symbol based on the composite energy profile. - View Dependent Claims (57, 58, 59, 60)
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Specification