IMTIC 2012: Emerging Trends and Applications in Information Communication Technologies pp 240-248 | Cite as
Angle Differential Modulation Scheme for Odd-Bit QAM
Abstract
In this paper, a method for differential encoding of odd-bit quadrature amplitude modulation (QAM) is presented. Differential encoding would allow QAM to be transmitted over media where coherent detection is not possible owing to phase ambiguity; it would allow such a transmission without the expense of the overhead incurred in data aided transmission. An example 32-QAM constellation is proposed and the algorithms for differential encoding and decoding of the proposed constellation are presented. The analytical performance of the given scheme is also discussed and is verified using simulation results. Results of differentially encoded detection scheme are also compared with those of coherent detection.
Keywords
Odd-bit quadrature amplitude modulation (QAM) cross QAM differential encoding coherent detection phase ambiguity error performancePreview
Unable to display preview. Download preview PDF.
References
- 1.Warrier, D., Madhow, U.: Spectrally efficient non-coherent communication. IEEE Trans. Information Theory 48(3) (2002)Google Scholar
- 2.Hwang, J.K., Chiu, Y.L., Liao, C.S.: Angle differential-QAM scheme for resolving phase ambiguity in continuous transmission system. Intl. Journal of Communication Systems 21, 631–641 (2008)CrossRefGoogle Scholar
- 3.Ma, Y., Zhang, Q.T., Schober, R., Pasupathy, S.: Diversity reception of DAPSK over generalized fading channels. IEEE Trans. Wireless Communications 4(4), 1834–1846 (2005)CrossRefGoogle Scholar
- 4.Dong, X., Tjhung, T.T., Adachi, F.: Error probability analysis for 16 star-QAM infrequency-selective Rician fading with diversity reception. IEEE Trans. Vehicle Technology 47, 924–935 (1998)CrossRefGoogle Scholar
- 5.Weber, W.J.: Differential encoding for multiple amplitude and phase shift keying systems. IEEE Trans. Communications 26, 385–391 (1978)CrossRefGoogle Scholar
- 6.Gini, F., Giannakis, G.B.: Generalized differential encoding: a nonlinear signal processing perspective. IEEE Trans. Signal Processing 46, 2967–2974 (1998)MathSciNetCrossRefGoogle Scholar
- 7.Wei, R.Y.: Differential encoding by a look-up table for quadrature amplitude modulation. IEEE Trans. Commun. 59(1) (2011)Google Scholar
- 8.Cioffi, J.: Signal processing: Digital communication course reader, p. 39. Stanford University (2007)Google Scholar
- 9.Xiong, F.: Digital modulation techniques, 2nd edn. Artech House (2006)Google Scholar