Answer Posted / rakesh kumar

1. Communication systems use this technology for multiple access technique for cell phone usage. It is a combination of TDMA and FDMA technologies and is therefore a hybrid version of the two. In this technique there is a secured communication because it uses an individual pseudo-noise sequence for each subscriber to the service. This technique is called digital sequence spread spectrum technology.

2. The original digital signal is converted to a higher frequency and this action tends to flatten or broaden the spread of the original spectrum in the frequency, also called a domain. As a result, the signal is visible as a noise but because of the pseudo-noise sequence the receiver does not hear this noise. This technology has drastically increased the number of subscribers that can exist in one cell. It also provides for a more secure communication link.

3. CDMA was developed during second world war in order to transmit signals in military high security provide a wide application in military.

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