By John G. Webster (Editor)
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Extra info for 10.Communications
J. C. Liberti and T. S. 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.
25, the following parameters are defined: • Ni, ni —original interference density (dBm/Hz) (ni in mW/ Hz), • NF—receiver noise figure (dB), • (No, no —thermal noise density (dBm/Hz) (no in mW/Hz), • (Ne, ne —out-of-band emission density (dBm/Hz) (ne in mW/Hz). 520 COCHANNEL INTERFERENCE All the summations in the following discussion are done in milliwatts per hertz, not in decibel-watts per hertz. Desensitization (D) for TDMA Systems (PCS1900, IS-136) and CDMA Systems (IS-95). Desensitization for TDMA systems is defined as D = 10 × log10 (ne + ni + no ) (ni + no ) dB (7) Here we need to know (ne ϩ ni ϩ no)/(ni ϩ no).
At the heart of a compandor is a variable loss device through which both compression and expansion are performed. At a compressor, the input speech signal to the variable loss device is divided by the output of the LPF. At an expandor, the input speech signal to the variable loss device is multiplied by the output of the LPF. An amplifier is then used to adjust the output signal level in either circuit. Quantitative Description. The relationships between the input and output signal levels of a compressor and expandor are described by Eqs.
10.Communications by John G. Webster (Editor)