Explain Processing Gain In Cdma?

1.	Explain Processing Gain In Cdma?
Answer» P (GAIN) = 10LOG (W/R) W is SPREAD Rate R is Data Rate For CDMA P (gain) = 10log (1228800/9600) = 21dB Actual processing gain = P (gain) - SNR = 21 – 7 = 14dB CDMA uses variable rate CODER The Voice Activity Factor of 0.4 is CONSIDERED = -4dB. CDMA has 100% frequency reuse. Use of same frequency in surrounding cells causes some additional interference. In CDMA, frequency reuse efficiency is 0.67 (70% eff.) = -1.73dB P (gain) = 10log (W/R) W is Spread Rate R is Data Rate For CDMA P (gain) = 10log (1228800/9600) = 21dB Actual processing gain = P (gain) - SNR = 21 – 7 = 14dB CDMA uses variable rate coder The Voice Activity Factor of 0.4 is considered = -4dB. CDMA has 100% frequency reuse. Use of same frequency in surrounding cells causes some additional interference. In CDMA, frequency reuse efficiency is 0.67 (70% eff.) = -1.73dB

Answer»

P (GAIN) = 10LOG (W/R)

W is SPREAD Rate

R is Data Rate

For CDMA P (gain) = 10log (1228800/9600)

= 21dB

Actual processing gain = P (gain) - SNR

= 21 – 7 = 14dB

CDMA uses variable rate CODER

The Voice Activity Factor of 0.4 is CONSIDERED = -4dB.

CDMA has 100% frequency reuse. Use of same frequency in surrounding cells causes some additional interference.

In CDMA, frequency reuse efficiency is 0.67 (70% eff.) = -1.73dB

P (gain) = 10log (W/R)

W is Spread Rate