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Why intermediate frequency for fm is 10.7 mhz and for am 455k hz??
One reason is it should not be in tuning range 0f am and fm 88to 108mhz
why only that number 10.7m ,455k why not other numbers LIKE 9.7m 11.7m etc??
Plz explain me...
Thanks in advance
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in this tutorial they say that in ofdm transmitter fft can be used in place of ifft and ifft in place of fft
is it true?
or fft transmitter must have ifft?
if fft is used in transmitter will there be mapper? bz it only converting input bit sequence in to complex...
data rate in 802.11a is 18 mbps
what does this specify?
why no of sub carriers(52) is not equal to FFT size(64)?
what for pilot carriers used?
what is 3db bandwidth in ofdm? what is its importece?
can any one explain concept of papr?
how papr is reduced by dht precoded matrix?
if we reduce papr will there be any information loss??
plz anser this??
1.how com discrete carriers(present in ifft) modulate input sequence?
2.which parameter of carrier is changing?(after modlation)
3.is this base band or band pass modulation?
4.why ofdm spectrum is continues? i,e sinc each having null at center of adjacent carrier..
VSATS aperture is small so gain is small,systems will have low g/t ratio at satellite know?how link exists?
in india star toplogy is mostly used why?why not mesh
my ansr is bz in mesh we need to have individual frequencies for up/down link and separate frequencies for each vasts ...is it...
to maintain orthogonality there should be integral no of cycles in ifft period T but as cyclic prefix is added its time period T will increase
then how orthogonality is maintained?
can any one tell what are questions one likely to be asked in OFDM in interview ??
1what is the difference between satellite and cellular communication?
2Why non sinusoidal signals are not used as carrier in modulation?
3Why the area of coverage in FM radio is less when compared with AM radio?
can ifft provide orthogonlity?
which block in ofdm will provide separation of 1/T. T is the time to transmit one symbol. is ifft right?
how precoded transform(wht ,dht etc..) decreases PAPR?
---------- Post added at 12:35 ---------- Previous post was at 12:32 ----------
if mapper does not...
what is the use of ifft block in ofdm ?
asn: to provide orthogonal between carriers..
and to conver freq to time domain but how can we know ( before ifft block )it is in frequency domain?
why can't we use fft block in transmitter and ifft blok in rx?
diff bet mapper and modulator??
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