12.24. (a) Consider a CDMA direct-sequence cellular telephone system, where each user requires an E/I, of 6 dB for acceptable voice quality. The chip rate is 3.68 Mchips/s, and the data rate is 14.4 kbits/s. Assume that the factors y, Gy, and H. are 1.5, 2.5, and 1.5, respectively, and that transmission ceases during speech pauses. How many users per cell can be supported? (b) If a powerful error-correcting code is used to lower the required E/I, by 1 dB, how many users per cell can be supported?
12.24. (a) Consider a CDMA direct-sequence cellular telephone system, where each user requires an E/I, of 6 dB for acceptable voice quality. The chip rate is 3.68 Mchips/s, and the data rate is 14.4 kbits/s. Assume that the factors y, Gy, and H. are 1.5, 2.5, and 1.5, respectively, and that transmission ceases during speech pauses. How many users per cell can be supported? (b) If a powerful error-correcting code is used to lower the required E/I, by 1 dB, how many users per cell can be supported?
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Transcribed Image Text:12.24. (a) Consider a CDMA direct-sequence cellular telephone system, where each user
requires an E/I of 6 dB for acceptable voice quality. The chip rate is 3.68
Mchips/s, and the data rate is 14.4 kbits/s. Assume that the factors y, Gy, and Ho,
are 1.5, 2.5, and 1.5, respectively, and that transmission ceases during speech
pauses. How many users per cell can be supported?
(b) If a powerful error-correcting code is used to lower the required Еŋ/ by 1 dB,
how many users per cell can be supported?
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