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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 Jun 2001
TL;DR: A soft-output receive diversity combining algorithm for the demodulation of continuous phase modulated (CPM) signals over space-time correlated frequency flat Rayleigh fading channels in the absence of perfect channel state information (CSI).
Abstract: Soft output detection algorithms are useful in systems where soft-decision metrics are important, e.g., systems with interleaved coded modulation. Receive diversity techniques can provide significant performance improvement for fading channels encountered in mobile communication systems. A soft-output receive diversity combining algorithm for the demodulation of continuous phase modulated (CPM) signals over space-time correlated frequency flat Rayleigh fading channels in the absence of perfect channel state information (CSI) is developed. The derived soft output algorithm is used in the iterative detection of interleaved TC-CPM. The performance of the algorithm is extensively characterized by means of Monte-Carlo simulations.

8 citations

Proceedings ArticleDOI
02 Oct 1998
TL;DR: Simulations show a good behavior of the algorithms in terms of bit error rate as a function of SNR, both in the case of blind equalization and source separation.
Abstract: Channel equalization and identification appear as key issues in improving wireless communications. It is known that the linearization of the GMSK modulation leads to a continuous phase OQPSK which can be considered as a Minimum SHift Keying (MSK) modulation. Thus methods of equalization and identification when the channel is input by MSK modulated signals is worth to look at. Most algorithms consider MSK signals as two independent white binary PAM staggered signals; this is not the case in our approach. Here, MSK signals are seen, after sampling at baud rate, as colored complex discrete signals. Even if this view of MSK modulation is quite simple, it has never been utilized with purpose of blind equalization. The particular statistics of such signals are studied, yielding an original closed-form analytical solution to blind equalization, both in the monovariate case and in the source separation problem. Simulations show a good behavior of the algorithms in terms of bit error rate as a function of SNR, both in the case of blind equalization and source separation.

8 citations

Proceedings ArticleDOI
01 Jan 2005
TL;DR: It is shown that the maximum a posteriori (MAP) symbol detection strategy, usually implemented by using the Forney observation model, can be equivalently implemented based on the samples at the output of a filter matched to the received pulse, i.e.,based on the Ungerboeck observation model.
Abstract: In this paper, we derive low-complexity MAP symbol detection algorithms for continuous phase modulations (CPMs). To obtain this result, the well-known problem of a transmission over an additive white Gaussian noise (AWGN) channel affected by known intersymbol interference (ISI) is first considered. We show that the maximum a posteriori (MAP) symbol detection strategy, usually implemented by using the Forney observation model, can be equivalently implemented based on the samples at the output of a filter matched to the received pulse, i.e., based on the Ungerboeck observation model. Although interesting from a conceptual viewpoint, the derived algorithm has a practical relevance in turbo equalization schemes for partial response signalling, where the implementation of a whitening filter can be avoided, and in the derivation of the simplified algorithms for CPM signals.

8 citations

Journal ArticleDOI
TL;DR: This work describes a framework for computing the information rate (IR) and the SE of such systems, and uses it for optimizing the channel spacing between adjacent users and the CPM phase response, and considers practical schemes, where CPMs are serially concatenated with an outer code.
Abstract: We consider a frequency division multiplexed system where each user adopts a continuous phase modulation (CPM) and multiuser detection is employed at the receiver side. The spectral efficiency (SE) is used as a performance measure to compare, from an information-theoretic point of view, different modulation formats. More precisely, we consider the new CPM formats recently included in the DVB-RCS2 standard. We describe a framework for computing the information rate (IR) and the SE of such systems, and use it for optimizing the channel spacing between adjacent users and the CPM phase response. Our analysis reveals that modulation formats adopted in the DVB-RCS2 standard are suboptimal in terms of SE, while if we allow multiuser detection excellent performance can be achieved by using simple binary formats and highly frequency packed signals. Furthermore, we consider practical schemes, where CPMs are serially concatenated with an outer code, and a low-complexity multiuser receiver is employed, showing that the theoretical limits predicted by the IR analysis can be approached.

8 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present a reflection-type phase shifter (RTPS) that uses anti-series diodes to achieve high linear output power, achieving a continuous phase shift of 180/spl deg/ at 1.88GHz.
Abstract: We present the design and development of a new reflection-type phase shifter (RTPS) that uses anti-series diodes to achieve high linear output power. Using this topology, the PS provides a continuous phase shift of 180/spl deg/ at 1.88GHz. The measured 1-dB compressed RF output power (P/sub 1 dB/) available from the PS is greater than 28dBm over the entire phase-control range.

8 citations


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