By Marvin K. Simon
A big examine bandwidth-efficient modulations with purposes to modern day house programBased on learn and effects got on the California Institute of Technology's Jet Propulsion Laboratory, this well timed e-book defines, describes, after which delineates the functionality (power and bandwidth) of electronic communique structures that comprise a wide selection 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 couple of useful (non-ideal) transmitter and receiver features akin to modulator and part imbalance, imperfect service synchronization, and transmitter nonlinearity. even if the cloth makes a speciality of the deep area functions built on the Jet Propulsion Laboratory, the presentation is satisfactorily large as to be appropriate to a bunch of different purposes facing RF communications.An very important contribution to the medical literature, Bandwidth-Efficient electronic Modulation with program to Deep area Communications* used to be commissioned through the JPL Deep area Communications and Navigation procedure heart of Excellence* highlights many NASA-funded technical contributions bearing on deep area communications structures* is part of the celebrated Deep house Communications and Navigation SeriesThe Deep area Communications and Navigation sequence is authored via scientists and engineers with wide adventure in astronautics, communications, and similar fields. It lays the root for innovation within the components of deep area navigation and communications by means of disseminating cutting-edge wisdom in key applied sciences.
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Additional info for Bandwidth-Efficient Digital Modulation with Application to Deep-Space Communications (Deep-Space Communications and Navigation Series 3)
Thus, we observe that while MSK (or precoded MSK) has a wider main lobe than OQPSK(or QPSK) by a factor of 3/2, its spectral sidelobes roll oﬀ at a rate two orders of magnitude faster. 8-37), respectively, as well as that of SFSK, which is given by [1, Chap. 8 38) 10 0 −10 −20 OQPSK G(f )/2PTb −30 −40 MSK −50 −60 −70 SFSK −80 −90 −100 0 1 2 3 4 5 f Tb Fig. 2-15. A comparison of the equivalent baseband PSDs of MSK, OQPSK, and SFSK. Redrawn from . , at a rate f −8 . , 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.
40 Chapter 2 1 (2n +1)Tb ∫ (2n −1)T ( )dt b a2n −1 −1 zc(t) C (t) cos 2 π fc t r (t) Data Combiner sin 2 π fc t νn Differential α n Decoder S (t) zs(t) (2n +2)Tb ∫ 2nT 1 ( )dt −1 b b2n Fig. 2-12. An I-Q receiver implementation of MSK. Unity Transmission αn s (t) MSK Modulator αn Differential Encoder νn Differential Decoder s (t) MSK Modulator Fig. 2-13. Two equivalent MSK transmitters. 4 Spectral Characteristics. 8-18) allows for simple evaluation of its PSD. 8 31) Constant Envelope Modulations 41 Differential Decoder νk MSK or SFSK Frequency Modulator Delay Tb C (t) νk −1 s (t) cos 2 π fc t νIk νk s (t) Serial to Parallel Converter νQk S (t) sin 2 π fc t Fig.
2-6(a), 2-6(b), and 2-6(c) using parameters identical to those used in arriving at Figs. 2-5(a) and 2-5(b). The ﬁnal result is that, in the presence of modulator imbalance, the nonlinear ampliﬁer tends to produce a more balanced signal constellation, and thus, the relative BEP performance Constant Envelope Modulations 25 10−1 Average Bit-Error Probability (a) 10−2 10−3 10−4 Balanced Case (ideal) Best Case with Specified Imbalances 10−5 Worst Case with Specified Imbalances 10−6 0 1 2 3 4 5 6 7 8 9 10 In-Phase Channel Bit-Error Probability 10−1 (b) 10−2 10−3 10−4 Balanced Case (ideal) Best Case with Specified Imbalances 10−5 Worst Case with Specified Imbalances 10−6 0 1 2 3 4 5 6 Eb / N0 (dB) 7 8 9 10 Quadrature-Phase Channel Bit-Error Probability Eb / N0 (dB) 10−1 (c) 10−2 10−3 10−4 Balanced Case (ideal) Best Case with Specified Imbalances 10−5 Worst Case with Specified Imbalances 10−6 0 1 2 3 4 5 6 7 8 9 10 Eb / N0 (dB) Fig.