By Robert Dixon
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Extra info for Radio Receiver Design (Electrical Engineering & Electronics) (Electrical and Computer Engineering)
Why is modulation necessary? For the same reasons that tuning is necessary. It is quite possible to transmit a voice signal, for example, by amplifying it and then coupling it with an antenna into the electromagnetic medium. It would then propagate with very low loss through that medium. There are two difficult problems with doing this, however. The first is that the size of the antenna required would be completely impractical, as a quarter-wavelength antenna at the middle of the audio band* would be over 45 km long.
Each technique has its advantages and disadvantages, which are BPSK Simplest to modulate or demodulate. Works best in linear channels. QPSK Higher data rate than BPSK. Works best in linear channels. OQPSK Same data rate as QPSK. Preferable to BPSK or QPSK in nonlinear channels. 23 shows the basic differences in these three techniques, which lie in the way in which phase shifts occur. 23b and c show that QPSK and OQPSK have 100 percent modulation at half of the phase shifts and none of the phase shifts, respectively.
6 FREQUENCY SHIFT KEYING Frequency shift keying will be considered in two categories. 1. Noncoherent FSK, in which frequency is shifted without regard to the phase relationship between frequency one and frequency two. A phase discontinuity is usually produced by such modulation. 88 times the data rate. At twice the data rate (the RW bctwecn the first nulls) the pon’er contained is approximately 95 percent, because of the unsuppressed carrier. 12 Baseband data signal BPSK modulating a carrier. 2.
Radio Receiver Design (Electrical Engineering & Electronics) (Electrical and Computer Engineering) by Robert Dixon