Topic
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.
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TL;DR: The expectation-maximization Viterbi algorithm (EMVA) introduced in a previous paper is applied to the blind or semi-blind maximum-likelihood equalization of continuous-phase modulated signals transmitted over a noisy linear finite impulse response (FIR) channel.
Abstract: We apply the expectation-maximization Viterbi algorithm (EMVA) introduced in a previous paper to the blind or semi-blind maximum-likelihood equalization of continuous-phase modulated (CPM) signals transmitted over a noisy linear finite impulse response (FIR) channel. The EMVA is a computationally efficient technique for simultaneously performing system identification and signal detection whenever the transmission system admits a hidden Markov model (HMM) description. The convergence properties of the EMVA are examined and a method for monitoring the EMVA convergence rate online is presented. It is shown that the order of the FIR channel can be estimated by applying the order-incrementing (OI) and fixed-order (FO) methods proposed previously. A Cramer-Rao bound is derived for the channel impulse response, and it is shown via simulations that the EMVA approaches this bound as the SNR increases. Finally, an EMVA-based technique is described for estimating the error covariance matrix for the system parameters for the case of long observation blocks.
29 citations
TL;DR: The Rimoldi model of CPM is employed to create a decomposed model of STC-CPM, which allows the search for good space-time codes to take into account the inherent encoding of the modulation.
Abstract: We develop space-time trellis coded (STC) schemes using continuous-phase modulation (CPM). We employ the Rimoldi model of CPM to create a decomposed model of STC-CPM. The decomposition separates the coding from the modulation. The space-time encoding and the inherent CPM encoding is combined into a single trellis encoder on the ring of integers modulo-. This is followed by a bank of memoryless modulators. The model allows the search for good space-time codes to take into account the inherent encoding of the modulation.
28 citations
TL;DR: A simple model with the continuous phase deviations of the clock signals considered as periodic signals in the band of the real disturbances is developed and Comparisons with the stochastic approach are presented.
Abstract: Phase-locked loops (PLLs) are designed to extract timing signals in telecommunication networks. Noise, cross-talk, inter-symbol interference, quantization noise, and signal distortion are responsible for oscillations in the time between two successive transitions of the clock or data signal. It appears as an accidental phase modulation superposed to the original signal. This phenomenon is called timing jitter and affects the integrity of the data recovering process and, as a consequence, the error bit rate is increased. This problem has been studied by treating the jitter as a band limited noise process and tolerance masks for the jitter amplitude and frequency are recommended for several network architectures. Here, we develop a simple model with the continuous phase deviations of the clock signals considered as periodic signals in the band of the real disturbances. Comparisons with the stochastic approach are presented.
28 citations
07 Jun 1993
TL;DR: The PPT appears to be a practical approach to parametric modeling of a class of nonstationary signals and its application to estimating the parameters of complex signals with continuous phase and slowly varying amplitudes is discussed.
Abstract: Presents a tutorial discussion of the polynomial phase transform (PPT) and its application to estimating the parameters of complex signals with continuous phase and slowly varying amplitudes. The PPT-based algorithm provides suboptimal but computationally efficient estimates of the signal parameters. The performance of the algorithm on single-component signals is discussed in some detail. Preliminary results on estimating multicomponent signals are presently briefly. The PPT appears to be a practical approach to parametric modeling of a class of nonstationary signals. >
28 citations
TL;DR: In this article, a real-time displacement measurement system using a sinusoidal phase modulating interferometer is proposed and demonstrated, which utilizes the frequency components of the interference signal to detect the desired phase or the displacement in real time.
Abstract: A real-time displacement measurement system using a sinusoidal phase modulating interferometer is proposed and demonstrated. The system utilizes the frequency components of the interference signal to detect the desired phase or the displacement in real time. The real-time phase detector is constructed with simple electronic circuits. The system also has a feedback loop to eliminate external disturbance. It is easy to measure the relatively large displacement that exceeds a half wavelength of the light because the compensation circuit is incorporated into the system to obtain continuous phase outside the region from 0 to 2π.
28 citations