System and method for determining received pilot power and path loss in a CDMA communication system
First Claim
1. A communication device having a power measurement circuit for determining the power of a first received spread-spectrum signal having a predetermined bandwidth, said communication device comprising:
- a first receiver circuit for measuring total received signal power in said predetermined bandwidth;
a second receiver circuit, coupled to said first receiver circuit, for measuring a ratio of signal energy of said first received spread-spectrum signal to a total received power spectral density in said predetermined bandwidth; and
a processor, coupled to said first receiver circuit and said second receiver circuit, for calculating power of said first received spread-spectrum signal in response to said measured total received signal power and said measured ratio of signal power.
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Accused Products
Abstract
A system and method for estimating the quality and path loss associated with a communications channel on the basis of the power of a pilot signal received by a communications receiver. The communications receiver measures a received signal power, and also makes a relative pilot strength measurement of a received pilot signal. The power of the pilot signal is then computed using the received signal power and the relative pilot strength measurement. An indication of channel quality based on the pilot signal power may be provided to a user of the communications receiver. Path loss of a communication channel between a base station and a remote site station is also estimated. The base station also transmits an indication of the power at which the pilot signal was transmitted. An estimate of the path loss is then made by determining the difference between the indicated power of the transmitted pilot signal and the received pilot signal power.
200 Citations
27 Claims
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1. A communication device having a power measurement circuit for determining the power of a first received spread-spectrum signal having a predetermined bandwidth, said communication device comprising:
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a first receiver circuit for measuring total received signal power in said predetermined bandwidth; a second receiver circuit, coupled to said first receiver circuit, for measuring a ratio of signal energy of said first received spread-spectrum signal to a total received power spectral density in said predetermined bandwidth; and a processor, coupled to said first receiver circuit and said second receiver circuit, for calculating power of said first received spread-spectrum signal in response to said measured total received signal power and said measured ratio of signal power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for determining the power of a first received spread-spectrum signal having a predetermined bandwidth in a code division multiple access communication device, comprising the steps of:
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measuring total received signal power in said predetermined bandwidth; measuring a ratio of signal energy of said first received spread-spectrum signal to a total received power spectral density in said predetermined bandwidth; and calculating power of said first received spread-spectrum signal in response to said measured total received signal power and said measured ratio of signal power. - View Dependent Claims (11, 12, 13)
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14. A method for estimating the reverse link path loss in a code division multiple access communication device which receives first and second spread spectrum signals having a predetermined bandwidth, the method comprising the steps of:
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measuring total received signal power in said predetermined bandwidth; measuring a ratio of signal energy of said first received spread-spectrum signal to a total received power spectral density in said predetermined bandwidth; calculating power of said first received spread-spectrum signal in response to said measured total received signal power and said measured ratio of signal power; extracting a transmitted power level signal from said second received spread spectrum signal; and calculating a reverse link path loss in response to said calculated power of said first received spread-spectrum signal and said extracted transmitted power level signal. - View Dependent Claims (15, 16, 17, 18)
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19. A communication system comprising:
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a first transmitter for transmitting a first spread spectrum signal having a predetermined bandwidth; and a receiver for receiving said first spread spectrum signal, comprising; a first receiver circuit for measuring total received signal power in said predetermined bandwidth; a second receiver circuit, coupled to said first receiver circuit, for measuring a ratio of signal energy of said first received spread-spectrum signal to a total received power spectral density in said predetermined bandwidth; and a processor, coupled to said first receiver circuit and said second receiver circuit, for calculating power of said first received spread-spectrum signal in response to said measured total received signal power and said measured ratio of signal power. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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Specification