Results 251 to 260 of about 435,575 (301)
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Carrier recovery for blind equalization
International Conference on Acoustics, Speech, and Signal Processing, 2003Carrier recovery techniques are presented that work with blind equalization of high-order QAM (quadrature amplitude modulation) signal constellations, specifically, the square uncoded 64-QAM and CCITT V.33 cross-trellis-coded 128-QAM constellations. The techniques were confirmed by laboratory experiments using a WE-DSP32-based real-time digital signal ...
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Self-compensating carrier aircraft recovery system
Journal of Aircraft, 1992Major improvements and expansion of the capabilities of the aircraft recovery systems that are now in service on our aircraft carriers are feasible with existing technology, without any major hardware design change and without jeopardizing the high reliability of the current hydraulic-mechanical arresting gear that was designed in the 1950s.
Rolf Brodersen, Gregory Sauer
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Synchronization: Carrier and Timing Recovery
1992The theme of this chapter might well be “…timing is everything.” In the course of our discussion in Chapter 4, we saw that the detection of a baseband digital data sequence presumed proper timing at the receiver. (See Section 4.10, particularly.) The same requirement for timing is present in the detection of passband signals; however, as we saw in ...
Richard D. Gitlin +2 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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Carrier phase recovery for turbo-coded linear modulations
2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333), 2003In this paper, we present a low-complexity carrier phase estimation algorithm suited for turbo-coded 16-QAM modems. The estimator is based on a maximum likelihood (ML) approach, and unlike previously published work, makes iterative use of soft decisions provided by the soft-in soft-out decoders within the overall iterative turbo decoding scheme ...
LOTTICI, VINCENZO, LUISE, MARCO
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Practical Carrier Recovery Method for Carrier-Assisted PDM-CO-OFDM Transmissions
37th European Conference and Exposition on Optical Communications, 2011For carrier-assisted PDM-CO-OFDM systems, we propose and demonstrate a practical carrier recovery method applying a very-simple moving average filter (MAF). Besides simplicity, we confirm its excellent performance from the results of a 16-QAM, 40-Gbps OFDM transmission experiment.
Wei-Ren Peng +3 more
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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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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 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 without pilot sub-carriers in coherent optical OFDM transmission systems
Optical Transmission Systems, Subsystems, and Technologies, 2011A carrier phase recovery method for optical transmission format of 16-QAM constellations is presented. The method can also be used in coherent optical single carrier or OFDM (CO-OFDM) system to implement blind phase recovery with low computational cost.
Wu Liu, Qi Yang
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