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Therefore, he rarely leaves the coverage area of the three sectors operating on the one tower in Blacksburg. However, last week he noticed that his calls were being interrupted, and the interruption in service was becoming more consistent. What particularly bothered the customer was that the voice quality of the other party was exceptional (indicating that there was no interference in the downlink). Nevertheless, frustrated with the consistent interruptions in service, the customer cancelled his PCS service and subscribed to a competing PCS service, which went into operation about a week ago.

ACKNOWLEDGMENTS Procedure. 1. Given D in decibels, the corresponding Ne is calculated using Eq. (7) or (8). 2. Find the path loss (PL) for the calculated Ne using the following expression. The emission power spectral density (received at the receiver antennas port of the receiver module) can be expressed as PL = Ptx − Ltx + Gtx + Emsk ( f ) − 10 × log10 (RBW) − Ne + Grx − Lrx dBm/Hz where Ptx is the Tx power at the antenna port of the Tx module (dBm), Ltx is the Tx cable loss (dB), Gtx is the Tx antenna gain (dB), ⌬f is the offset frequency of the emission relative to the carrier frequency, Emsk is the Emission mask specification at ⌬f, RBW is the resolution bandwidth (Hz), PL is the required path loss (dB), Grx is the Rx antenna gain (dB), Lrx is the Rx cable loss (dB).

Rappaport, Analytical results for capacity improvements in CDMA, IEEE Trans. Veh. , 43: 680– 690, 1994. 13. L. B. Milstein, Interference rejection techniques in spread spectrum communications, Proc. IEEE, 76: 657–671, 1988. 14. H. V. Poor and L. A. Rusch, Narrowband interference suppression in spread spectrum CDMA, IEEE Personal Comm. Magazine, 1994, pp. 14–27, 3rd quarter. 15. L. A. Rusch and H. V. Poor, Narrowband interference suppression in CDMA SS communications, IEEE Trans. , 42: 1969–1979, 1994.

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