Method and apparatus for determining an end of a subframe in a TDD system
First Claim
Patent Images
1. A method for determining an end of a first period in which signals are communicated in a first direction, the method comprising:
- sampling a signal for a period of time up to at least as long as the longest expected length of the first period to obtain a sampled signal;
integrating the sampled signal in a processing device to obtain an integrated power curve;
subtracting a reference line from the integrated power curve in the processing device to obtain a rotated power curve;
selecting a peak in the rotated power curve as an end of the first period; and
setting a switch based on the end of the first period.
13 Assignments
0 Petitions
Accused Products
Abstract
A method for determining an end of a first period in which signals are communicated in a first direction is provided. The method comprises sampling a signal for a period of time up to at least as long as the longest expected length of the first period to obtain a sampled signal. The sampled signal is integrated to obtain an integrated power curve. A reference line is subtracted from the integrated power curve to obtain a rotated power curve. A peak in the rotated power curve is selected as an end of the first period.
-
Citations
27 Claims
-
1. A method for determining an end of a first period in which signals are communicated in a first direction, the method comprising:
-
sampling a signal for a period of time up to at least as long as the longest expected length of the first period to obtain a sampled signal; integrating the sampled signal in a processing device to obtain an integrated power curve; subtracting a reference line from the integrated power curve in the processing device to obtain a rotated power curve; selecting a peak in the rotated power curve as an end of the first period; and setting a switch based on the end of the first period. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An apparatus for switching in a time division duplexing (TDD) system comprising:
-
a switch having a first port coupled to an uplink communication path and a second port coupled to a downlink communication path; a power level detector to output a power level signal indicative of a power level of a signal representing a radio frequency signal propagating through the switch; a processing device configured to cumulatively sum samples of the power level signal output by the power level detector to produce an summed power curve, wherein the processing device is configured to subtract a reference line from the summed power curve to obtain a rotated power curve, and wherein the processing device is configured to control the switch based on a time of a peak in the rotated power curve. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. A communication system comprising:
-
at least one hub that is configured to communicate with a base station; a plurality of remote antenna units communicatively coupled to the at least one hub and configured to communicatively couple signals between the at least one hub and a plurality of wireless terminals; wherein the at least one hub further comprises; a switch having a first port coupled to an uplink communication path and a second port coupled to a downlink communication path; a power level detector configured to measure a power level of radio frequency signals propagating through the switch; a processing device configured to cumulatively sum a sampled signal obtained by the power level detector to produce an summed power curve, wherein the processing device is configured to subtract a reference line from the summed power curve to obtain a rotated power curve, and wherein the processing device is configured to control the switch based on a time of a peak in the rotated power curve. - View Dependent Claims (16, 17, 18, 19, 20)
-
-
21. An apparatus for switching in a time division duplexing system comprising:
-
an interface to communicatively couple the apparatus to a communication medium, wherein the apparatus is operable to switch between outputting first signals on the communication medium and receiving second signals from the communication medium in accordance with a time division duplexing scheme; a power level detector to output samples indicative of a power level of the first signals; and a processing device configured to cumulatively sum the samples output by the power level detector to produce an summed power curve, wherein the processing device is configured to subtract a reference line from the summed power curve to obtain a rotated power curve, and wherein the processing device is configured to control the switching between outputting first signals on the communication medium and receiving second signals from the communication medium based on a time of a peak in the rotated power curve. - View Dependent Claims (22, 23, 24, 25, 26, 27)
-
Specification