Results 271 to 280 of about 140,728 (306)
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Nanocrystal Recovery by Use of Carrier Particles
Crystal Growth & Design, 2014Aqueous dispersions of nanoparticles (nanosuspensions) of poorly soluble drugs are an effective option for addressing issues of low and erratic bioavailability. They are, however, not attractive as dosage forms due to their predisposition to physical and chemical instability. Here we describe an effective method for isolating nanocrystals in solid form
Khan, Shahzeb +3 more
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Amplitude Modulation, Demodulation, and Carrier Recovery
2021In this chapter we will learn about amplitude modulation (AM) of signals: double side-band with (large) carrier (DSB-LC) and with suppressed carrier (DSB-SC), and single side-band (SSB) with only left (LSB) or only right (USB) side-band. We will become familiar with Hilbert transform role in amplitude modulation and demodulation and with importance of ...
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Universal carrier recovery for APK signals
Proceedings of the IEEE, 1983A Costas loop with adjustable quantizers is demonstrated to be capable of carrier recovery for a wide range of Amplitude-Phase-Keyed (APK) modulation formats. Expeximental verification was obtained for QPSK, 8-PSK, and 16-QAM.
J.F. Moss, J.B. Beyer
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Reduced-Jitter Carrier Frequency Recovery
COIN-NGNCON 2006 - The Joint International Conference on Optical Internet and Next Generation Network, 2006Both the steady-state and transient performances of a carrier frequency recovery loop are improved by simply overlapping the observation intervals for successive frequency offset estimations by half. The proposed scheme does not require any additional hardware circuitry.
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A novel sub-carrier recovery method for multi-carrier CDM system
Proceedings IEEE 56th Vehicular Technology Conference, 2003Multi-carrier code division multiplexing (MC-CDM) is one of promising multiplexing techniques for fourth-generation mobile downlink communications systems, where high data rate services should be provided even for high speed-cruising mobiles. This paper proposes an MMSE (minimum mean square error)-based adaptive equalizer for MC-CDM downlink system ...
S. Tsumura, S. Hara
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Carrier Frequency Recovery with Linear Modulations
1997A frequency recovery system accomplishes two basic functions: (i) it derives an estimate v of the carrier frequency offset; (ii) it compensates for this offset by counter-rotating the received waveform r(t) at an angular speed 2πv. In the ensuing discussion we distinguish between two major cases [1]: (i) the offset is much smaller than 1/T,
Umberto Mengali, Aldo N. D’Andrea
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Carrier Phase Recovery with CPM Modulations
1997In this chapter we consider carrier phase recovery for CPM signaling. By and large the presentation follows the same route taken with linear modulations. In particular, data-aided (DA) estimation is considered first, then we concentrate on decision-directed (DD) methods and, finally, on non-data-aided (NDA) techniques (either clock-aided or non-clock ...
Umberto Mengali, Aldo N. D’Andrea
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Carrier Phase Recovery with Linear Modulations
1997In this chapter we investigate algorithms for carrier phase estimation with linear modulations. As with frequency recovery, ML estimation methods will play a central role in our study. We shall see that various approximations to the ML formulation are possible, leading to different estimation methods.
Umberto Mengali, Aldo N. D’Andrea
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Recovery of a Circum-Lunar Instrument Carrier
1958Recovery of a Circum-Lunar Instrument Carrier. The possibility of the physical recovery of a circum-lunar vehicle widens the scope of scientific investigations possible for a vehicle with lunar capabilities. While a very high guidance capability is necessary to impact such a recoverable vehicle within a given area on the earth’s surface, only moderate ...
Carl Gazley, David J. Masson
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