By Marvin K. Simon, Joseph H. Yuen
An incredible examine bandwidth-efficient modulations with functions to ultra-modern house programBased on examine and effects got on the California Institute of Technology's Jet Propulsion Laboratory, this well timed publication defines, describes, after which delineates the functionality (power and bandwidth) of electronic verbal exchange platforms that include a large choice of bandwidth-efficient modulations acceptable for the layout and implementation of house communications systems.The writer compares the functionality of those platforms within the presence of a few sensible (non-ideal) transmitter and receiver features reminiscent of modulator and section imbalance, imperfect provider synchronization, and transmitter nonlinearity. even if the cloth specializes in the deep area purposes built on the Jet Propulsion Laboratory, the presentation is satisfactorily huge as to be acceptable to a number of different purposes facing RF communications.An vital contribution to the clinical literature, Bandwidth-Efficient electronic Modulation with software to Deep house Communications* used to be commissioned via the JPL Deep area Communications and Navigation method middle of Excellence* highlights many NASA-funded technical contributions relating deep area communications structures* is part of the celebrated Deep area Communications and Navigation SeriesThe Deep house Communications and Navigation sequence is authored through scientists and engineers with wide event in astronautics, communications, and similar fields. It lays the basis for innovation within the components of deep area navigation and communications by means of disseminating state of the art wisdom in key applied sciences.
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Extra info for Bandwidth-Efficient Digital Modulation with Application to Deep-Space Communications
Sample text
The more derivatives that go to zero at the endpoints t = 0 and t = 2Tb , the wider will be the main lobe but the faster the sidelobes will roll off. 8-38), respectively. 5 Other Transmitter Representations. a. Cross-Coupled I-Q Transmitter. A variation of the I-Q transmitter discussed in Sec. 2 is illustrated in Fig. 2-17 [24,25,26]. An modulated carrier at frequency fc is multiplied by a lowpass sinusoidal signal at frequency 1/4Tb to produce a pair of unmodulated tones (carriers) at f2 = fc + 1/4Tb and f1 = fc − 1/4Tb .
3 Precoded MSK. The differential encoder that precedes the I-Q portion of the transmitter in Fig. 2-11 requires a compensating differential decoder at the receiver following I-Q demodulation and detection (see Fig. 2-12). Such a combination of differential encoding at the transmitter and differential decoding at the receiver results in a loss in power performance relative to that obtained by conventional OQPSK (this will be discussed in more detail later on in the chapter). It is possible to modify MSK to avoid such a loss by first recognizing that the CPM form of modulator in Fig.
This form of modulator has the practical advantage of not requiring addition of RF signals or RF filtering since there is no actual mixing of the carriers with the modulating signals. Massey shows that, analogous to what is shown in Fig. 2-21, the output of the modulator can be represented by a trellis (Fig. 2-24), where again each branch is labeled with the input bit and the signal transmitted. Note that the trellis is time varying (the branch labels alternate with a period of two). In view of the trellis representation in Fig.
