COFDM Flashcards
1
Q
What is the difference between COFDM and OFDM
A
COFDM - uses channel coding and source coding
2
Q
What is channel coding important in COFDM?
A
Channel coding uses Forward Error Correction
3
Q
Why is OFDM better than FDM?
A
•OFDM has improved BWE
•OFDM removes interference with orthogonal signals
•OFDM doesn’t require different frequencies for same message
4
Q
What makes Inter-Carrier Interference(ICI) exist in COFDM systems?
A
Doppler Shift
5
Q
What system mitigates the severe multipath problems by using a differential QPSK?
A
DAB
6
Q
Inputs to the iFFT block in the OFDM system are
A
Modulated symbols loaded onto subcarriers
7
Q
In a non- uniform QAM, symbol bits are transmitted using ?
A
Different bit error rates
