UNIT 4 WC REVISION

1.Which among the following is NOT a mitigation technique for wireless receiver?

• Equalisation
• Diversity Reception
• Channel coding
• Multiplexing

2.The objective of Equalisation is to combat

• ISI
• Noise
• Fading
• Jitter

3. The main cause for ISI in Wireless Communication is

• Delay disperison
• Bandwidth insufficiency
• High correlation
• Reflection

4. Frequency Selective Fading occurs when

• Bandwidth of channel <Bandwidth of signal
• Bandwidth of channel >Bandwidth of signal
• Bandwidth of channel = 2 times of Bandwidth of signal
• Bandwidth of channel is infinitesimal

5. Equalisers must be

• adaptive
• narrative
• correlative
• additive

6. An equalizer within a receiver compensates for the average range ofexpected channel amplitude and delay characteristics.

• true
• false

7. ISI mainly causes __________________at receivers

• burst errors
• single bit errors
• multiple frame reception
• redundancy

8.A known fixed-length training sequence is sent by the transmitter so that the receiver's equalizer may average to a proper setting. This phase of equalisation is

• Training
• Tracking
• Tuning
• Trimming

9.An adaptive equaliser is a one that adapts itself to ______

• variation in gain
• variation in channel characteristics
• variation in stability
• variations in siganal strength

10.A Generic Adaptive Equalizer is a transversal filter with N delay elements and _____________taps.

• N
• N-1
• N+1
• 2N+1