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Continuous phase modulation

About: Continuous phase modulation is a research topic. Over the lifetime, 3199 publications have been published within this topic receiving 37245 citations. The topic is also known as: CPM.


Papers
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Journal ArticleDOI
TL;DR: In this paper, a phase shifter based on a dual-parallel Mach-Zehnder modulator (DP-MZM) consisting of two sub-mZMs and a polarization rotator is proposed and demonstrated.
Abstract: A wideband microwave photonic phase shifter implemented based on a special dual-parallel Mach–Zehnder modulator (DP-MZM) consisting of two sub-MZMs and a polarization rotator is proposed and demonstrated. A microwave signal to be phase shifted is applied to the two sub-MZMs, via a 90° hybrid coupler, to generate two orthogonally polarized intensity-modulated optical signals, which are combined at a polarization beam combiner. A phase-shifted microwave signal is obtained by detecting the combined signal at a photodetector. The tuning of the phase shift is realized by tuning the DC bias voltages applied to the sub-MZMs. Since the phase shift tuning has been done electrically, high speed phase tuning can be implemented. The proposed phase shifter is experimentally demonstrated. A continuous phase tuning from 0° to 360° with small magnitude variations of less than ±1 dB and phase ripple standard deviation of less than 2.7° in a decade bandwidth from 2.5 to 25 GHz is realized. The system insertion loss is measured to be 10.8 dB. Investigation on the cause of magnitude and phase deviations is also performed by simulations, which are confirmed by experimental measurements.

9 citations

Journal ArticleDOI
TL;DR: A phase-locked-loop (PLL)-based architecture is proposed for direct generation of frequency stable, high-power Gaussian minimum shift keying (GMSK) and other continuous phase modulations at microwave and millimeter-wave frequencies.
Abstract: A phase-locked-loop (PLL)-based architecture is proposed for direct generation of frequency stable, high-power Gaussian minimum shift keying (GMSK) and other continuous phase modulations at microwave and millimeter-wave frequencies. A continuous phase frequency shift-keyed (CPPSK) signal with a modulation index of 0.5 is produced at the desired output frequency using a full 360/spl deg/ linear continuous phase modulator that is controlled by the integrated baseband information signal. This modulated signal is used as the reference signal for a phase-locked high-power voltage-controlled oscillator. The PLL facilitates reference signal frequency tracking and provides Gaussian spectral shaping to the modulated output signal, PLL imperfections and their effect on the modulated output signal are considered, and simulation results are presented.

9 citations

Proceedings ArticleDOI
01 Jan 1999
TL;DR: The method differs from current modulation recognition methods in that it estimates the best model of the transmission system, based on observations of the noisy received signal, instead of using pattern recognition approaches or estimating parameters of the received signals.
Abstract: Presents a simple technique for differentiating between frequency modulated (FM) and phase modulated (PM) signals, commonly referred jointly to as angle modulation. The method differs from current modulation recognition methods in that it estimates the best model of the transmission system, based on observations of the noisy received signal, instead of using pattern recognition approaches or estimating parameters of the received signals.

9 citations

Journal ArticleDOI
TL;DR: The design of bit-interleaved coded continuous phase modulation is characterized by the code rate, alphabet size, modulation index, and pulse shape and a methodology for determining the optimal values of these parameters under bandwidth and receiver complexity constraints is outlined.
Abstract: The design of bit-interleaved coded continuous phase modulation (CPM) is characterized by the code rate, alphabet size, modulation index, and pulse shape. This paper outlines a methodology for determining the optimal values of these parameters under bandwidth and receiver complexity constraints. The cost function that is used to drive the optimization is the information theoretic minimum epsivb/No, which is found by evaluating the constrained channel capacity. The capacity can be estimated using Monte Carlo integration. A search for optimal parameters is conducted over a range of coded CPM parameters, bandwidth efficiencies, and channels. To limit complexity and allow any modulation index to be considered, the receiver is constrained to use a soft-output differential phase detector. Bit error rate curves using a binary turbo code confirm that the constrained capacity is a very good indicator of the performance of the complete system.

9 citations

Proceedings ArticleDOI
22 Apr 2003
TL;DR: In this paper, a coded modulation system with continuous phase and a small controlled envelope variation is proposed, which is called the system constrained envelope continuous phase modulation (ceCPM) and shows that there is a gain for ceCPM over CPM under the same spectrum constraint.
Abstract: We develop a coded modulation system with continuous phase and a small controlled envelope variation. We call the system constrained envelope continuous phase modulation (ceCPM) and show that, there is a gain for ceCPM over CPM under the same spectrum constraint. With normalized amplitude varying in the interval {1/spl plusmn/0.2} the gain for ceCPM is up to 2.5 dB over CPM at symbol error probability 10/sup -3/. We also show that ceCPM performs well with reduced state sequence detection (RSSD).

9 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202316
202241
202136
202060
201976
201870