Abstract
The increasing demands for wireless communication, especially in consumer electronics applications, result in substantially and continuously increasing reliability and quality of service (QoS) requirements. This trend creates a need to introduce intelligent functionalities in the wireless devices, which leads to the concept of cognitive radio (CR) technology. In some CR applications such as dynamic spectrum access (DSA), the CR terminal should be able to modify its transmission parameters in order to communicate with an efficient utilization of the spectrum resource. In such a case, the CR terminal would be capable of reconfiguring itself with minimum supplementary information to achieve best performance. In this paper we propose a blind carrier recovery loop with respect to the modulation scheme suited to CR applications. Unlike conventional solutions which use a separate modulation identification device before performing carrier recovery, the introduced loop employs a hierarchical symbol decision to achieve phase lock, and then the S-curve and the variance of a decision directed phase error detector are used to extract an information about the modulation scheme of the incoming signal. After the phase lock with the hierarchical decision, the constellation used in the received signal is detected, and then the true decisions are used to drive the recovery loop. Results obtained with different digital linear modulations (8-PSK, 16-QAM 16-APSK, 64-QAM) indicate that the introduced loop is capable of achieving a real-time modulation scheme detection as well as keeping phase lock for adaptive modulation scheme transmissions.
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References
H. Arslan, Cognitive Radio, Software Defined Radio, and Adaptive Wireless Systems (Springer, Berlin, 2007)
O. Azarmanesh, S. Bilén, A novel modulation-classification technique for software defined radio applications, in SDR’08 Conference, November 2008
L. Berlemann, S. Mangold, Cognitive Radio and Dynamic Spectrum Access (Wiley, New York, 2009)
S. Bilén, A. Price, O. Azarmanesh, J. Urbina, Modulation classification for radio interoperability via SDR, in SDR’07 Conference, November 2007
M. Cave, C. Doyle, W. Webb, Essentials of Modern Spectrum Management, Cambridge Wireless Essentials Series (Cambridge University Press, Cambridge, 2007)
R. De Gaudenzi, A. Guillen i Fabregas, A. Martinez, Performance analysis of turbo-coded APSK modulations over nonlinear satellite channels, IEEE Trans. Wireless Commun., 2396–2407 (2006)
R. De Gaudenzi, A. Guillen i Fabregas, A. Martinez, A. Ponticelli, High power and spectral efficiency coded digital modulation schemes for nonlinear satellite channels, in Seventh International Workshop on Digital Signal Processing Techniques for Space Communications, Sesimbra, Portugal, Oct 2001
O.A. Dobre, Y. Bar-Ness, Blind modulation classification: a concept whose time has come, in IEEE/Sarnoff Symposium, April 18–19 2005, pp. 223–228
O.A. Dobre, A. Abdi, Y. Bar-Ness, W. Su, A survey of automatic modulation classification techniques: classical approaches and new trends. IET Commun. 1(2) (2007)
G. Faria, DVB-T hierarchical modulation—an opportunity for new services (1999)
B. Fette, Cognitive Radio Technology, 2nd edn. (Academic Press, New York, 2009)
F.M. Gardner, Demodulator reference recovery techniques suited for digital implementation, European Space Agency, Final Report, ESTEC Contract No. 6847/86/NL/DG, Aug. 1988
T. Jesupret, M. Moeneclaey, G. Ascheid, Digital demodulator synchronization performance analysis, European Space Agency, Final Report, ESTEC Contract No. 8437/89/NL/RE, June 1991
P.Y. Kam, Maximum likelihood carrier phase recovery for linear suppressed-carrier digital data modulations. IEEE Trans. Commun. COM-34, 522–527 (1986)
G. Karam, J. Kervarec, H. Sari, P. Vandamme, All-digital implementation of the carrier recovery loop in digital radio system, in International Conference on Communications, Denver, CO, USA, June 23–26 1991
A. Leclert, P. Vandamme, Universal carrier recovery loop for QASK and PSK signal sets. IEEE Trans. Commun. COM-31, 130–136 (1983)
W.C. Lindsey, M.K. Simon, Carrier synchronization and detection of polyphase signals. IEEE Trans. Commun. 20, 441–454 (1972)
U. Mengali, A.N. D’Andrea, Synchronization Techniques for Digital Receivers, Applications of Communication Theory (Plenum, New York, 1997)
A. Metref, D. Le Guennec, J. Palicot, Optimized decision-directed carrier recovery loop for 16-QAM constellations, in Global Telecommunications Conference GLOBECOM ’07, Washington DC, USA, November 26–30 2007
A. Metref, D. Le Guennec, J. Palicot, S-curve theoretical analysis of a classical and a hierarchical phase detector for QAM constellations, in Seventh IEEE International Symposium on Signal Processing and Information Technology ISSPIT ’07, Cairo, Egypt, December 15–18 2007
A. Metref, D.L. Guennec, J. Palicot, Hierarchical decision based carrier recovery in a software radio context, in IEEE Proc. WSR, Karlsruhe, Germany, March 2008
H. Meyr, M. Moeneclaey, S.A. Fechtel, Digital Communication Receivers, Synchronization, Channel Estimation and Signal Processing, Wiley Series in Telecommunications and Signal Processing (1998)
R.H. Morelos-Zaragoza, K. Umebayashi, A carrier recovery technique using modulation identification, in International Conference on Third Generation Wireless and Beyond 3GWireless’01, San Francisco, CA, May 30–June 2 2001
S. Moridi, H. Sari, Analysis of four decision-feedback carrier recovery loops in the presence of intersymbol interference. IEEE Trans. Commun. COM-33, 543–550 (1985)
D. Mottier, Associations des fonctions d’égalisation, de synchronisation et de décodage canal pour les transmissions numériques à grande efficacité spectrale, Ph.D. thesis, Institut National des Sciences Appliquées de Rennes, 1997
P. Pinto, S. Silva, H. Miranda, An adaptive software radio receiver architecture for linear bidimensional modulations, in 6th Baiona Workshop on Signal Processing in Communications, Baiona, Spain, September 2003
H. Sari, S. Moridi, New phase and frequency detectors for carrier recovery in PSK and QAM systems. IEEE Trans. Commun. COM-36, 1035–1043 (1988)
A. Schertz, C. Weck, Hierarchical modulation—the transmission of two independent DVB-T multiplexes on a single frequency, EBU Technical review, April 2003
M.K. Simon, J.G. Smith, Carrier synchronization and detection of QASK signal sets. IEEE Trans. Commun. COM-22, 98–106 (1974)
N.M.B. Souto, F.A.B. Cercas, R.Y.M. Dinis, J.C.M. Silva, On the BER performance of hierarchical M-QAM constellations with diversity and imperfect channel estimation. IEEE Trans. Commun. 55, 1852–1856 (2007)
K. Umebayashi, R.H. Morelos-Zaragoza, Evaluation of the multimode PLL using the modulation identification techniques in ISDB-S, in SDR’04 Conference, November 2004
K. Umebayashi, R.H. Morelos-Zaragoza, R. Kohno, Method of non-data-aided carrier recovery with modulation identification. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. E87-A(3), 656–665 (2004)
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Metref, A., Le Guennec, D. & Palicot, J. A Carrier Recovery Loop for Cognitive Radio Applications. Circuits Syst Signal Process 30, 847–870 (2011). https://doi.org/10.1007/s00034-011-9307-8
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DOI: https://doi.org/10.1007/s00034-011-9307-8