87.

88.

89.

90.

91.

92.

93.

94.

The channel capacity may be improved by using

(A) Cell splitting (B) Hand off

(C) Frequency hopping (D) Channel spacing

If bandwidth over which the channel has constant gain and linear phase response

is smaller than the bandwidth of the transmitted signal, the received signal
undergoes

(A) Flat fading (B) Rayleigh fading

(C) Frequency selective fading (D) Slow fading

____ is a dynamic database which stores all important information needed for
users currently associated to the MSC.

(A) ISDN (B) VLR

(C) HLR (D) EIR

In mobile communication, the commonly used shape of a cell is hexagon because
(A) Fewer number of cells are required

(B) Provides maximum processing density than any other geometrical shape

(C) It leaves no uncovered area

(D) All of the above

Which of the following multiple access scheme is using soft handover?
(A) FDMA (B) TDMA
(C) SDMA (D) CDMA

The operation subsystem of GSM has OMC, AuC and EIR. Here EIR stands for

(A) Enhanced identity register

(B) Equipment identity register

(C) Electronic identity register

(D) Equipment inbuilt register

Crosstalk from two different radio transmitters using the same channel may result
in

(A) Adjacent channel interference (B) Multiple access interference

(C) Co-channel interference (D) Self-interference

__ resolves the problem of limited radio spectrum.
(A) handover (B) cell splitting
(C) frequency hopping (D) MAC

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