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A system for providing an accurate interference value signal received over a channel and transmitted by an external transceiver. The system includes a first receiver section for receiving the signal, which has a desired signal component and an interference component. A signal extracting circuit extr

A system for providing an accurate interference value signal received over a channel and transmitted by an external transceiver. The system includes a first receiver section for receiving the signal, which has a desired signal component and an interference component. A signal extracting circuit extracts an estimate of the desired signal component from the received signal. A noise estimation circuit provides the accurate interference value based on the estimate of the desired signal component and the received signal. A look-up table transforms the accurate noise and/or interference value to a normalization factor. A carrier signal-to interference ratio circuit employs the normalization factor and the received signal to compute an accurate carrier signal-to-interference ratio estimate. Path-combining circuitry generates optimal path-combining weights based on the received signal and the normalization factor.

대표청구항 ▼

1. A code division multiple access (CDMA) communication apparatus, comprising:means for receiving a signal over a wireless channel, the received signal comprising a desired signal component and an interference component; means for estimating carrier signal-to-interference and interference energy of

1. A code division multiple access (CDMA) communication apparatus, comprising:means for receiving a signal over a wireless channel, the received signal comprising a desired signal component and an interference component; means for estimating carrier signal-to-interference and interference energy of the received signal to generate an interference energy value and a signal-to-interference ratio of the received signal, the means for estimating carrier signal-to-interference and interference energy comprising means for extracting an estimate of the desired signal component from the received signal; and means for generating summed weighted-path signals in response to the interference energy value and the estimate of the desired signal component. 2. The apparatus of claim 1, further comprising means for generating soft decision values based on the summed weighted-path signals.3. The apparatus of claim 2, wherein the means for generating soft decision values comprises a log-likelihood ratio generator.4. The apparatus of claim 2, further comprising means for generating decoded signals based on the soft decision values.5. The apparatus of claim 4, further comprising means for generating a message selected from the group consisting of a rate control message and a power fraction request message based on the signal-to-interference ratio.6. The apparatus of claim 1, wherein the means for receiving a signal comprises an intermediate-frequency (IF)-to-baseband converter to generate spread-spectrum in-phase and quadrature signals based on the received signal.7. The apparatus of claim 6, wherein the means for extracting an estimate of the desired signal component comprises a pseudo-noise despreader to generate despread in-phase and quadrature signals based on the spread-spectrum in-phase and quadrature signals.8. The apparatus of claim 7, wherein the means for extracting an estimate of the desired signal component further comprises a decoverer connected to the pseudo-noise despreader to separate data signals along a data channel and a pilot signal along a pilot channel from the despread in-phase and quadrature signals.9. The apparatus of claim 8, wherein the data channel is described by the following equation:s=√{square root over (M{circumflex over (E)})}s,l·ej{circumflex over (θ)}lXt, where s represents the data channel, M is the number of chips per Walsh symbol, ?s,l is modulation symbol energy of an lth multipath component of the data channel, {circumflex over (θ)}l is the phase of the data channel s, and Xt is an information-bearing component of the data channel.10. The apparatus of claim 8, wherein the means for estimating carrier signal-to-interference and interference energy further comprises a pilot filter connected to the decoverer to generate a filtered pilot signal.11. The apparatus of claim 10, wherein the filtered pilot signal is described by the following equation:p=M√{square root over(?)}p,t·ejθl where p represents the filtered output signal, M is the number of chips per Walsh symbol, ?p,t is pilot chip energy of an lth multipath component of p, and θl is the phase of p.12. The apparatus of claim 11, wherein the means for estimating carrier signal-to-interference and interference energy further comprises a forward link constant generator capable of generating a forward link constant.13. The apparatus of claim 12, wherein the forward link constant is described by the following equation: where c represents the forward link constant, Ior is received energy of the desired signal component; and Ep is pilot chip energy.14. The apparatus of claim 13, wherein the means for estimating carrier signal-to-interference and interference energy further comprises a look-up table capable of generating a reciprocal of the interference energy value based on the despread in-phase and quadrature signals, the filtered pilot signal and the forward link constant.15. The apparatus of claim 14, wherein the means for generating summed weighted-path signals comprises:a constant generator capable of generating a constant where Es is modulation symbol energy; and a multiplier connected to the constant generator and the pilot filter to generate an estimate of a channel coefficient {circumflex over (α)}=√{square root over(?)}s,t·ej{circumflex over (θ)}l, where ?s,l is an estimate of the modulation symbol energy of the lth multipath component, and {circumflex over (θ)}l is an estimate of the phase of the pilot signal. 16. The apparatus of claim 15, wherein the summed path-weighted signals are generated based on the estimate of the channel coefficient, the reciprocal of the interference energy value, and the number of chips per Walsh symbol.