Time dispersion measurement in radio communications systems
First Claim
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1. A method of measuring time dispersion in a signal that has been received from a channel, the method comprising the steps of:
- generating a set of received samples from the received signal, wherein the set of received samples corresponds to a known training sequence;
using the known training sequence and the corresponding set of received samples to generate one or more channel estimates;
for each of the one or more channel estimates, determining a corresponding residual energy metric from the corresponding channel estimate, the known training sequence and the corresponding set of received samples;
using the one or more residual energy metrics to estimate received useful energy, C, and reflection energy, R, in the received signal; and
comparing the estimated received useful energy and the estimated reflection energy to determine a measure of time dispersion in the signal that has been received from the channel.
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Abstract
Time dispersion of a signal that has been received from a channel is measured by utilizing metrics to determine the energy inside an equalizer window and outside of the equalizer window. In one embodiment, the estimate of the energy outside the window is a difference between residual interference estimates. In another embodiment, the estimate of the energy outside the window is a difference between residual impulse response power estimates.
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15 Claims
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1. A method of measuring time dispersion in a signal that has been received from a channel, the method comprising the steps of:
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generating a set of received samples from the received signal, wherein the set of received samples corresponds to a known training sequence; using the known training sequence and the corresponding set of received samples to generate one or more channel estimates; for each of the one or more channel estimates, determining a corresponding residual energy metric from the corresponding channel estimate, the known training sequence and the corresponding set of received samples; using the one or more residual energy metrics to estimate received useful energy, C, and reflection energy, R, in the received signal; and comparing the estimated received useful energy and the estimated reflection energy to determine a measure of time dispersion in the signal that has been received from the channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification