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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: This paper presents a general feedforward symbol-timing estimation framework based on the conditional maximum likelihood principle and the proposed timing estimator is shown to be asymptotically equivalent to the classic square-law nonlinearity estimator under certain conditions.
Abstract: This paper presents a general feedforward symbol-timing estimation framework based on the conditional maximum likelihood principle. The proposed timing estimator presents reduced implementation complexity and is obtained by performing an approximation on the Fourier series expansion of the conditional maximum likelihood function. The proposed algorithm is applied to linear modulations and two commonly used continuous phase modulations: minimum shift keying (MSK) and Gaussian MSK (GMSK). For the linear modulations, it is shown both analytically and via simulations that the performance of the proposed estimator is very close to the conditional CRB and modified CRB for signal-to-noise ratios (SNRs) in the range SNR /spl les/ 30 dB. Furthermore, the proposed estimator is shown to be asymptotically equivalent to the classic square-law nonlinearity estimator under certain conditions. In the case of MSK and GMSK modulations, although the proposed algorithm reaches the conditional CRB at certain SNRs, however, the conditional CRB is quite far away from the modified CRB, and there exists an alternative algorithm whose performance comes closer to the modified CRB. Therefore, the proposed estimator is more suitable for linear modulations than for MSK and GMSK modulations.

22 citations

Journal ArticleDOI
TL;DR: The performance of a hybrid modulation technique derived from binary frequency shift keying is presented, and the performance of complete and expurgated phase codes is examined for the Gaussian and Rayleigh fading channels.
Abstract: The performance of a hybrid modulation technique derived from binary frequency shift keying is presented. In the hybrid scheme, each frequency is allowed to be phase modulated with any of p discrete, equally spaced phase shifts. The spectral separation between frequencies is chosen to make the carriers orthogonal, thus generating a multidimensional modulation scheme. The performance of complete and expurgated phase codes is examined for the Gaussian and Rayleigh fading channels, and their spectral characteristics are determined. >

22 citations

Patent
Eory Frank Steven1
03 Apr 1995
TL;DR: In this paper, a digital rotating complex phasor generator (60) provides a constant magnitude continuous phase signal at either a positive or a negative frequency for translating the frequencies of a modulated signal from a near-zero intermediate frequency (IF) to baseband.
Abstract: A digital rotating complex phasor generator (60) provides a constant magnitude continuous phase signal at either a positive or a negative frequency for translating the frequencies of a modulated signal from a near-zero intermediate frequency (IF) to baseband. The rotating complex phasor generator allows a digital receiver front-end to down-convert the received signal to an IF of substantially zero Hertz prior to analog to digital conversion, even in the presence of large Doppler frequency shifts and tuning uncertainties which may result in a residual IF carrier which has either a positive or a negative frequency.

22 citations

Journal ArticleDOI
TL;DR: A general approach to an outage probability definition based on the concept of the outage domain is introduced, and bit error probability is suitably obtained for linearly modulated signals by adopting a semianalytical approach, and for nonlinear modulation signals, by means of simulation.
Abstract: This paper presents a general methodology for performance characterization of digital transmission systems in the presence of cochannel interference, as a function of the actual number of interferers (ranging from zero to infinity). The bit error probability in time-invariant channels and outage probability in time-varying quasi-stationary channels are discussed. More precisely, a general approach to an outage probability definition based on the concept of the outage domain is introduced. This allows the discussion of the relation to the other definitions which have appeared in the literature and the proposal of some new more accurate methods for the evaluation of outage probability. A suitable comparison between exact evaluation, the well-known Gaussian approximation, and the other new approaches proposed in this paper, is carried out to evaluate performance, bit error probability is suitably obtained for linearly modulated signals by adopting a semianalytical approach, and for nonlinear (e.g., continuous phase) modulation signals, by means of simulation. Finally, as an example, the different approaches to derive performance discussed in the paper have been applied to a linear microcellular scenario.

22 citations

Patent
Venkatesh Vadde1, Kiran Kuchi1
06 Aug 2004
TL;DR: In this paper, a power synthesizer is in several (n) discrete stages, each stage having a discrete amplitude, constant envelope amplifier coupled in series with a continuous phase modulator, each modulator is actuated simultaneously but not necessarily to modulate the signal phase similarly.
Abstract: A power synthesizer is in several (n) discrete stages, each stage having a discrete amplitude, constant envelope amplifier coupled in series with a continuous phase modulator. Each modulator is actuated simultaneously, but not necessarily to modulate the signal phase similarly. For circuit power combining, the modulators are coupled to inputs of the amplifiers, while the separately modulated and amplified bits are combined prior to being fed to the antenna. For spatial power combining, each modulator is coupled to the input of an amplifier which in turn feeds one of several antennas. Each stage operates on one bit, and each successive nth stage amplifies the input bit by a factor of a0 /2 n -1 . Preferably, a discrete amplitude generator converts an (analog) output of an IFFT block to a binary sequence, and each bit is fed to a separate stage. The power synthesizer converts a digital output of the discrete amplitude generator to analog at RF rather than at baseband, rendering a baseband DAC, and a separate upconverter, unnecessary.

22 citations


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