Communication Engineering MCQs | Page - 6

Explanation: like is-136, is-95 system was designed to be compatible with the existing us analog cellular system (amps) frequency band. hence, mobile and base stations can be economically produced for dual mode operation.

Explanation: is-95 uses a direct sequence spread spectrum cdma system. it allows each user within a cell to use the same radio channel, and users in adjacent cell also use the same radio channel.

Explanation: is-95 uses different modulation and spreading technique for the forward and reverse links. on the forward link, the base station simultaneously transmits the user data for all mobiles in the cell by using different spreading sequence for each mobile.

Explanation: is-95 is specified for reverse link operation in the 824-849 mhz band and 869-894 mhz for the forward link. the pcs version of is-95 has also been designed for international use in the 1800-2000 mhz bands.

Explanation: user data is spread to a channel chip rate of 1.2288 mchip/s (a total spreading

Explanation: at both the base station and the subscriber, rake receivers are used to resolve and combine multipath components, thereby reducing the degree of fading. a rake receiver exploits the multipath time delays in a channel and combines the delayed replicas of transmitted signal.

Explanation: ct2 was the second generation of cordless telephones introduced in great britain in 1989. it is used to provide telepoint services which allow a subscriber to use ct2 handsets at a public telepoint.

Explanation: ct2 is a digital version of the first generation, analog, cordless telephones. when compared with analog cordless phones, ct2 offers good speech quality and is more resistant to interference.

Explanation: for a error free channel

Explanation: according to shannon the average effective information is obtained by subtracting the equivocation from the entropy of the source.