Detection Path Design for Communication Systems
First Claim
1. An apparatus comprising:
- a wireless radio frequency (RF) module that transmits a wireless signal specified in a wireless standard;
a signal detector that detects a reference signal, a forward path signal and a reverse path signal, wherein the reference signal is a modulation signal of transmitted signal; and
a phase estimator responsive to the signal detector and estimates a phase shift between the forward path signal and the reverse path signal.
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Accused Products
Abstract
Methods and apparatus are provided for detection path design for reflection coefficient estimation. In one novel aspect, a hardware-based phase estimator estimates a phase shift between the forward path signal and the reverse path signal. In one embodiment, a data selector is used to pass only signals above a magnitude threshold. In another embodiment, a modified phase unwrap algorithm stores an unwrapping correction for subsequent samples and updates the stored unwrapping correction upon processing of each sample processed. In another novel aspect, mixed hardware and software solutions are used. In one embodiment, the reference signal and the detection signals are matched such that the modulation signal interference is removed. In some embodiments, one or two power detectors and a cross-correlator are used. In yet another embodiment, two detection measurement paths are used to obtain the reflection coefficient. In one embodiment, fractional timing offset is estimated to obtain the reflection coefficient.
19 Citations
20 Claims
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1. An apparatus comprising:
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a wireless radio frequency (RF) module that transmits a wireless signal specified in a wireless standard; a signal detector that detects a reference signal, a forward path signal and a reverse path signal, wherein the reference signal is a modulation signal of transmitted signal; and a phase estimator responsive to the signal detector and estimates a phase shift between the forward path signal and the reverse path signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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transmitting a wireless signal in a wireless system by a wireless transmitter; obtaining detection signals on-the-fly through a coupler, wherein the detection signals comprising a forward signal and a reverse signal; and obtaining a reflection coefficient based on at least the detection signals, wherein the reflection coefficient includes a magnitude coefficient and a phase coefficient. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus, comprising
a wireless radio frequency (RF) module that transmits a wireless signal specified in a wireless standard; -
a detector that measures a forward signal and a reverse signal; and a reflection coefficient estimator that obtains a reflection coefficient based on at least the forward and reverse signals, wherein the reflection coefficient includes a magnitude coefficient and a phase coefficient. - View Dependent Claims (18, 19, 20)
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Specification