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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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Proceedings ArticleDOI
11 Oct 1993
TL;DR: In this article, the authors considered the problem of estimating the modulation index of continuous phase modulated (CPM) signals in noise and derived analytical expressions for the cyclic autocorrelation and fourth-order cumulant sequences that permit the formulation of a maximum likelihood estimator.
Abstract: The authors address the problem of the estimation of the modulation index of continuous phase modulated (CPM) signals in noise. In a previous work (1993) they considered the same problem when the CPM signal was sampled at the symbol rate and thus constituted a stationary sequence. In this case, sampling is performed at a higher rate, and thus the discrete sequence becomes cyclostationary. Analytical expressions are derived for the cyclic autocorrelation and fourth-order cumulant sequences that permit the formulation of a maximum likelihood estimator. Simulation examples illustrate the performance of both methods. >

14 citations

Journal ArticleDOI
TL;DR: In this paper, a comparison between linear decentralized power modulation and centrally coordinated modulation of multiterminal hvdc systems is made, based on a fast on-line dc load flow solution which recognizes the nonlinearities of converter operation.
Abstract: A comparison is made between linear decentralized power modulation and centrally coordinated modulation of multiterminal hvdc systems. The centralized method is based on a fast on-line dc load flow solution which recognizes the nonlinearities of converter operation. A computer simulation of an integrated ac/dc power system demonstrates that the centralized approach can utilize dc overload capacity more efficiently than decentralized modulation.

14 citations

Journal ArticleDOI
TL;DR: A system capable of simultaneous high-data rate communication transmission and precision ranging is investigated, and a specific scheme is introduced by combining continuous phase modulation (CPM) and a pseudonoise (PN) ranging code denoted as CPM + PN.
Abstract: The construction of a navigation constellation with inter-satellite links (ISLs) has become one of the important development trends for new-generation global navigation satellite systems (GNSSs), and ISLs currently realize navigation and communication functions through separate low-rate omnidirectional telemetry, tracking, command and high-rate data service channels, respectively. If the above two functions are integrated into one channel, this will result in simplification of the onboard equipment, improvement of the electromagnetic compatibility, power consumption reduction and frequency resources savings, and we speculate that autonomous navigation will be achieved by ISLs with navigation and communication fusion. In this paper, a system capable of simultaneous high-data rate communication transmission and precision ranging is investigated, and a specific scheme is introduced by combining continuous phase modulation (CPM) and a pseudonoise (PN) ranging code denoted as CPM + PN. The chip pulse is one of the key factors to design the ranging code, which not only affects the ranging performance but also influences the properties of the CPM + PN scheme, such as its spectral characteristics, communication reliability, and acquisition time. To consider the above performance indexes, a new chip pulse based on a normally distributed wave is proposed. Theoretical analysis and simulation results show that compared to square-wave and half-sine wave cases, the normally distributed wave attains great advantages in the ranging accuracy and communication reliability, which become more notable with reasonable selection of the energy distribution index. Moreover, the proposed chip pulse achieves a similar acquisition time as the traditional wave. As a result, the normally distributed wave can be used as a better alternative to the ranging chip pulse for the CPM + PN waveform.

14 citations

Journal ArticleDOI
TL;DR: A simple, robust processing strategy, called the fading magnitude-integrate sample and dump (FM-ISD) processor, is proposed for use with limiter-discriminator detection of CPM signals in Rayleigh, fast fading channels.
Abstract: A simple, robust processing strategy, called the fading magnitude-integrate sample and dump (FM-ISD) processor, is proposed for use with limiter-discriminator detection of CPM signals in Rayleigh, fast fading channels. The FM-ISD processor is introduced as a simplification of an optimal estimator-correlator receiver. The performance is compared to a standard integrator processor and found to provide an improvement in performance for all values of signal-to-noise ratio. The FM-ISD processor is also shown to be robust to changes in modulation format, channel fading rate and pre-detection filter type. >

14 citations

Journal ArticleDOI
TL;DR: Simulation results show that this algorithm with an appropriate memory length has better performance at low signal-to-noise ratio (SNR) than other estimators applicable to partial-response CPM in the literature, and that the performance losses of this algorithm caused by residual carrier frequency offset (CFO) and timing offset are acceptable in practice.
Abstract: Based on Laurent's representation of continuous-phase modulated (CPM) signals, a channel shaping prefiltering method is exploited to transform the overall channel impulse response (CIR) into one that approximates a two-path desired impulse response (DIR). By utilizing this property of the overall CIR, a differential algorithm for the estimation of the modulation index of partial-response CPM is derived as an approximation to a quasi-maximum likelihood estimator. In this algorithm, the tradeoff between the robustness to time-varying phase and performance can be controlled by a memory length parameter. Also, in this algorithm, an error compensation technique is proposed to reduce the estimation error resulting from the high-order components of Laurent's decomposition. Simulation results show that this algorithm with an appropriate memory length has better performance at low signal-to-noise ratio (SNR) than other estimators applicable to partial-response CPM in the literature, and that the performance losses of this algorithm caused by residual carrier frequency offset (CFO) and timing offset are acceptable in practice. Owing to its high convergence rate, this algorithm is appropriate for short-packet applications.

14 citations


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