Method and instrument for measuring receiving SIR and transmission power controller
First Claim
1. A received SIR (signal-to-interference plus noise power ratio) measuring method of a communications system using a signal including a known pilot signal inserted into an information signal at predetermined intervals, said method comprising:
- the step of measuring received wave power in which average value is adopted as the received wave power wherein the step of measuring received wave power comprising steps of;
carrying out interpolating coherent detection of information data symbols from received data symbols by using the pilot signal;
computing power values of the information data symbols decided by interpolation integrating the power values of the information data symbols in the predetermined interval of the pilot signal to compute said average value of the power values;
the step of measuring received interference wave power in which a ratio is computed of an integral of the information data symbols to an integral of the power differences wherein the step of measuring received interference wave power comprising steps of;
computing differences between power values of the decided information data symbols and power values of a fading envelope at same sampling times;
obtaining an integral of said differences of the power values in the predetermined intervals of the pilot signal; and
the step of computing a ratio of the received desired wave power to the received interference wave power, wherein the step of measuring received interference wave power comprising steps of the computed ratio is adopted as the SIR.
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Accused Products
Abstract
An SIR measuring apparatus with a simple configuration capable of improving the accuracy of received SIR measurement in CDMA mobile radio equipment using pilot symbols. A received signal (20) is input to a synchronization detector (21) that regenerates the clock timing of symbols and frame timing equivalent to the repetition period of the pilot signal. An interpolating coherent detector (22) produces information symbols (23) obtained from the received signal (20) through absolute phase coherent detection. A decision signal power calculator (24) obtains desired wave power values. A quasi-interference power calculator (25) obtains differences between the power values of the information symbols and a fading envelope, and adopts the differences as the quasi-interference power. Integrators (26 and 27) integrate received desired wave power and quasi-interference wave power. An SIR measuring portion (28) divides an averaged received desired wave power integral by an averaged quasi-interference power integral to obtain the received SIR (29).
183 Citations
24 Claims
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1. A received SIR (signal-to-interference plus noise power ratio) measuring method of a communications system using a signal including a known pilot signal inserted into an information signal at predetermined intervals, said method comprising:
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the step of measuring received wave power in which average value is adopted as the received wave power wherein the step of measuring received wave power comprising steps of; carrying out interpolating coherent detection of information data symbols from received data symbols by using the pilot signal; computing power values of the information data symbols decided by interpolation integrating the power values of the information data symbols in the predetermined interval of the pilot signal to compute said average value of the power values; the step of measuring received interference wave power in which a ratio is computed of an integral of the information data symbols to an integral of the power differences wherein the step of measuring received interference wave power comprising steps of; computing differences between power values of the decided information data symbols and power values of a fading envelope at same sampling times; obtaining an integral of said differences of the power values in the predetermined intervals of the pilot signal; and the step of computing a ratio of the received desired wave power to the received interference wave power, wherein the step of measuring received interference wave power comprising steps of the computed ratio is adopted as the SIR.
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2. A received SIR (signal-to-interference plus noise power ratio) measuring method of a communications system using a signal including a known pilot signal inserted into an information signal at predetermined intervals, said method comprising:
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computing power values of a fading envelope obtained by interpolation; the step of measuring received desired wave power which includes the step of averaging the power values in a section between successive pilot signals, and which adopts the obtained average value as the received desired wave power; the step of measuring received interference wave power which obtains received interference wave power from received data symbols and the fading envelope obtained by the interpolation; and the step of computing a ratio of the received desired wave power to the received interference wave power, wherein the computed ratio is adopted as the SIR. - View Dependent Claims (3, 4, 5, 6, 7)
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8. A received SIR (signal-to-interference plus noise power ratio) measuring method of a communications system using a signal including a known pilot signal inserted into an information signal at predetermined intervals, said method comprising:
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the step of measuring received desired wave power including the steps of; computing ratios of received data symbols to a fading envelope obtained by interpolation, multiplying the ratios by a square of the fading envelope, averaging products of the multiplication in the section between successive pilot signals, and obtaining a square of an absolute value of an average value obtained by the averaging, wherein the square of the absolute value is adopted as the received desired wave power; the step of measuring received interference wave power which obtains received interference wave power from the received data symbols and the fading envelope obtained by the interpolation; and the step of computing a ratio of the received desired wave power to the received interference wave power, wherein the computed ratio is adopted as the SIR. - View Dependent Claims (9, 10, 11, 12)
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13. A received SIR measuring apparatus of a communications system using a signal including a known pilot signal inserted into an information signal at predetermined intervals, said apparatus comprising:
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coherent detection means for carrying out interpolating coherent detection using the pilot signal; means for computing power values of the information data symbols decided by interpolation; means for obtaining an integral of the power values of the information data symbols in the predetermined interval of the pilot signal; means for computing differences between power values of the decided information data symbols and power values of a fading envelope at same sampling times; means for obtaining an integral of said differences of the power values in the predetermined interval of the pilot signal; and means for computing a ratio of the integral of the power values of the information data symbol to the integral of said differences of the power values, wherein the computed ratio is adopted as the signal-to-interference plus noise power ratio (SIR). - View Dependent Claims (24)
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14. A received SIR measuring apparatus of a communications system using a signal including a known pilot signal inserted into an information signal at predetermined intervals, said apparatus comprising:
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a received desired wave power measuring circuit including; means for computing power values of a fading envelope obtained by interpolation, and means for averaging the power values in a section between successive pilot signals, wherein the obtained average value is adopted as the received desired wave power; a received interference wave power measuring circuit for measuring received interference wave power from received data symbols and the fading envelope; and a computing circuit for computing a ratio of the received desired wave power to the received interference wave power, wherein the computed ratio is adopted as the SIR. - View Dependent Claims (15, 16, 17)
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18. A received SIR measuring apparatus of a communications system using a signal including a known pilot signal inserted into an information signal at predetermined intervals, said apparatus comprising:
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a received desired wave power measuring circuit including, means for computing ratios of received data symbols to a fading envelope obtained by interpolation, means for multiplying the ratios by a square of the fading envelope, and means for averaging products of the multiplication in the section between successive pilot signals, wherein a square of an absolute value of the average value is adopted as received desired wave power; a received interference wave power measuring circuit for measuring received interference wave power from the received data symbols and the fading envelope; and a computing circuit for computing a ratio of the received desired wave power to the received interference wave power, wherein the computed ratio is adopted as the SIR. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification