similarities in  multiplexing and  modulation?
409884
Excepting that they sound similar, there are no other similarities.\n\nMultiplexing\nMultiplexing allows you to share a uncommon resource.\nJust like People in an office share a common printer.\n\nModulation\nModulation provides a means of transferring information.\nJust like a envelop(a carrier) holds the written message (infmn) in a post.
254300
http://en.wikipedia.org/wiki/Time-division_multiplexing
450183
this might prove to be useful:\nhttp://islab.oregonstate.edu/koc/ece575/02Project/Mor/
951978
Look up convergence theory on www.colorado.edu/communication/met.  It will explain this theory in fairly simple terms.
540116
Here's some modem sound effects:\nhttp://www.findsounds.com/ISAPI/search.dll?keywords=modem
243416
loss= coupler loss + fiber loss + detector loss
116354
http://www.networkphysics.com/products/literature/case_studies/mpls.shtml
651191
Phase matching is also a strongly variant function of temperature, more so than phase matching angle.  You have to specify at what temperture the gain medium is held constant in order to specify the optimum phase matching angle.  Phase matching is also a function of the signal wavelength, which you have generalized verily from 3-12 microns.  The angle is gonna change so much over that wavelength range that you can't specify a single best phase matching angle.\n\nWhat do you have, an OPO?  What's this application?
556680
http://en.wikipedia.org/wiki/Modulation_index
463210
Asynchronous Transfer Mode
936965
Analog and Digital systems just imply the type of modulation.\n\nFundamentally it doesn't matter what the carrier frequency is, so sharing bandwidth is okay .... the FCC may disagreed though.
522363
you can use a fm modulator
57773
What kind of enhancement?  Just how much work do you expect us to do?  Also, I'm assuming DCT is equivalent to DFT and you're just asking what to do with the signal's spectrum.
1175882
the information is quantized, that is, it is assigned some voltage values and then it is modulated, for that modulation there are several techniques with different frequencies intervales. in the case of cable, the channel that is used to send the information is the optical fiber, so u use a transductor from voltage to light and then at the receiver u have a transducter that does the opposite. the receiver is usually the nearest cable station to ur house, so, actually the optical fiber doesn't go to your house, i'll bet u have a coaxial cable that goes up to the decoder. if u don't have a decoder (actually i'm not from the U.S. so i don't  really know if the system is the same, but it must be a lot alike) the cable goes directly to your tv, it means it wasn't codified and it is easier for your neighbors to steal your cable system. and then your tv has a system to convert this voltage signal to the images u see, and that's about it!
627347
Amplitude modulated radio radiation is the result of a disturbance in space. The signal travel in all directions and can be received at a wide range of location. However Am transmission is very suceptible to noise. Hence a lack of fidelity.\n\nFrequence modulation is really Power modulation rather than amplitude.Since the signal can vary as a fucntion of frequency there is better clarity in the reception. But the .Television signal Use the same principle as FM.Hower since the wave lenght of the signal carrier is much shorter. Hence they are more directional.The transmison cannot be as wide spread as the long wave in Am.
1014972
Because one of the main reasons of modulation is to shift a signal from one frequency band to another. Multiplication by a sinusoidal does this shifting directly because multiplication by a sinusoid in time domain is equivalent to a shift in frequency domain, this is one of the properties of fourier transform. Any other periodic signal other than a sinusoid will, in addition to the shift you want, introduce other "waste" or rubbish components at other frequency bands which may harm your system or someone else's. Got the point?
81045
Frequency Division Multiplexing refers to sharing the wide frequency spectrum/band into multiple narrow channels or bins to send data on each one of the bins as if they had the entire narrow bandwidth to themselves. This is the basis for DSL, Wireless, Digital TV, etc.\n\nRef: http://en.wikipedia.org/wiki/OFDM