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US 5,835,848 AGranted
Range repeater for a transmission system
AssigneeLucent Technologies Inc.
InventorsQi Bi, Robert Evan Myer
Life of this patent
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Abstract
The invention is a repeater for a telecommunications transmission system such as a CDMA wireless system. The repeater reduces leakage by using a feedback signal whose amplitude and phase are adjusted in response to the amplitude and phase of a sampled input signal when a switch turns off the normal output of the repeater for a short period of time. In one embodiment, a pilot signal is transmitted during this time period so that the sampled input is the leakage signal. In another embodiment, the sampled input is the normal transmission signal received during the time period.
Claims9
A repeater comprising:
- means for receiving input signals and means for transmitting output signals;
- means for sampling an output signal and for feeding back the sampled output signal so as to subtract any leakage signal from an input signal;
- means for stopping transmission of an output signal for a first designated time interval during which a received input signal is sampled;
- means for determining the amplitude and phase of the input signal received during the interval;
- and
- means for adjusting the amplitude and phase of the feedback signal based on the amplitude and phase of the input signal received during the designated time interval.
3 more elements
Dependencies are inferred from the claim text.