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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: The results show that the proposed modulation scheme outperforms 16-quadratic-amplitude modulation (16-QAM) with the turbo code in the Rayleigh-fading environment.
Abstract: This paper proposes a novel single-sideband quadrature phase shift keying (SSB QPSK) modulation scheme that utilizes a single-reference carrier frequency and transforms both baseband I and Q components into the same radio frequency band, whose width is exactly half that of QPSK. The modulation method is first derived and followed by the analysis of the matched filter demodulation. The analysis shows that there are performance degradations due to intersymbol interference (ISI) in the received signal and correlation in the received noise. To suppress the degradations, this paper employs a turbo equalizer for demodulation, in which the effects of ISI and noise correlation can be suppressed by a soft canceler and a noise whitening filter in the minimum mean square error (MMSE) linear equalizer, respectively. The computer simulations are then used to verify the proposed modulation scheme. At the transmitter, the root-raised cosine rolloff filter is employed for pulse shaping and Hilbert-transformed pulse generation. The truncation of the signal pulse is performed by the window function. The results show that the proposed modulation scheme outperforms 16-quadratic-amplitude modulation (16-QAM) with the turbo code in the Rayleigh-fading environment.

11 citations

Proceedings ArticleDOI
01 Jul 2018
TL;DR: The performance of a directional modulation system based on continuous phase control of a 2-and 4-element array is presented in this paper, where measured results obtained outside an anechoic chamber are provided to demonstrate the transmission of secure and multichannel communications using quadrature amplitude modulation.
Abstract: The performance of a directional modulation system based on continuous phase control of a 2- and 4-element array is presented. Measured results obtained outside an anechoic chamber are provided to demonstrate the transmission of secure and multichannel communications using quadrature amplitude modulation.

11 citations

Proceedings ArticleDOI
06 Apr 2003
TL;DR: A single frequency estimation method with large estimation range and low computational complexity is used to compute the carrier frequency offset and the estimator has a feedforward structure and is suitable for burst mode transmission.
Abstract: The paper presents a non-data-aided (NDA) carrier frequency offset estimation algorithm for GMSK modulation. A nonlinearity of the GMSK signal is shown to be a sine wave with frequency related to the carrier frequency offset. Based on that, a single frequency estimation method with large estimation range and low computational complexity is used to compute the carrier frequency offset. The estimator has a feedforward structure and is suitable for burst mode transmission. Its estimation accuracy is good and the estimation range is a quarter of the symbol rate, which is illustrated by simulation results.

11 citations

01 Oct 2002
TL;DR: In this paper, the effect of multipath and adaptive equalization for three modulation techniques for airborne telemetry has been examined, which are either already in use, or have been proposed, for different operating bandwidths.
Abstract: It is widely recognized that telemetry channels, particularly airborne channels, are afflicted by multipath propagation effects. It has also been shown that adaptive equalization can be highly effective in mitigating these effects. However, numerous other factors influence the behavior of adaptive equalization, and the type of modulation employed is certainly one of these factors. This is particularly true on modulations which exhibit different operating bandwidths. In this paper, we will examine the effect multipath and adaptive equalization for three modulation techniques which are either already in use, or have been proposed, for airborne telemetry.

11 citations

Proceedings ArticleDOI
07 Oct 2002
TL;DR: Study of the application of decision feedback sequence estimation (DFSE) in order to equalize a 64 kbit/s dual-h quaternary full response CPM waveform transmitted over a representative 25 kHz UHF MILSATCOM channel shows DFSE equalization offers an effective and computationally manageable approach to higher data rates using legacy waveforms.
Abstract: To meet the demand for higher data rate MIL-STD-188-181B has added a set of dual-h continuous phase modulation (CPM) waveforms that nearly double the available data rates without requiring additional transmit power. Unfortunately, rates greater than 56 kbit/s are constrained by severe intersymbol interference (ISI) induced by narrow satellite crystal filters. In this paper, we study the application of decision feedback sequence estimation (DFSE) in order to equalize a 64 kbit/s dual-h quaternary full response CPM waveform transmitted over a representative 25 kHz UHF MILSATCOM channel. The performance is evaluated by Monte-Carlo simulation. Results show DFSE equalization offers an effective and computationally manageable approach to higher data rates using legacy waveforms.

11 citations


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