Abstract
Reliable and accurate time delay estimation is an important signal processing problem and is critical to a diverse set of applications. Multi-user receivers in asynchronous Code Division Multiple Access (CDMA) systems require the knowledge of several parameters including delay estimates between users. In this paper, we address this problem by proposing a novel approach based on blind least mean squares (LMS) based early-late delay tracker. Analytical expressions have been derived and simulation results of the proposed delay tracker are compared with the classical delay locked loop (DLL) approach in a multipath fading scenario. These results show that the proposed delay tracker provides very good tracking performance in challenging cases of multipath delays.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Iltis, R.A.: A DS-CDMA tracking mode receiver with joint channel/delay estimation and MMSE detection. IEEE Trans. Communications 49(10), 1770–1779 (2001)
Burnic, A., et al.: Synchronization and channel estimation in wireless CDMA systems. In: IEEE 9th International Symposium on Spread Spectrum Techniques and Applications, pp. 481–487 (2006)
Flanagan, B., et al.: Performance of a joint Kalman demodulator for multiuser detection. In: Proceedings of the 2002 IEEE 56th Vehicular Technology Conference, VTC 2002-Fall, vol. 3. IEEE (2002)
Ghirmai, T., et al.: Joint symbol detection and timing estimation using particle filtering. In: Proceedings of the 2003 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2003, vol. 4. IEEE (2003)
Ge, F.-X., et al.: Super-resolution time delay estimation in multipath environments. IEEE Transactions on Circuits and Systems I, 1977–1986 (2007)
Masmoudi, A., Billili, F., Affes, S.: Time Delays Estimation from DS-CDMA Multipath Transmissions Using Expectation Maximization. In: 2012 IEEE Vehicular Technology Conference (VTC Fall). IEEE (2012)
Glisic, S.G.: Adaptive WCDMA Theory and Practice. John Wiley & Sons (2003)
Yuan, Y.X.: A new step size for the steepest descent method. Journal of Computational Mathematics 24(2), 149–156 (2006)
Grandshteyn, I.S., Ryzhik, I.M.: Table of Integral, Series, and Products, 7th edn. Academic Press, Elsevier (2007)
Lim, T.J., Rasmussen, L.K.: Adaptive symbol and parameter estimation in asynchronous multiuser CDMA detectors. IEEE Transactions on Communications 45(2), 213–220 (1997)
Ali, Z., Memon, Q.A.: Time Delay Tracking for Multiuser Synchronization in CDMA Networks. Journal of Networks 8(9), 1929–1935 (2013)
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2014 Springer International Publishing Switzerland
About this paper
Cite this paper
Ali, Z., Khan, A.A. (2014). Tracking Performance of the Blind Adaptive LMS Algorithm for Fading CDMA Systems. In: Thampi, S., Gelbukh, A., Mukhopadhyay, J. (eds) Advances in Signal Processing and Intelligent Recognition Systems. Advances in Intelligent Systems and Computing, vol 264. Springer, Cham. https://doi.org/10.1007/978-3-319-04960-1_16
Download citation
DOI: https://doi.org/10.1007/978-3-319-04960-1_16
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-04959-5
Online ISBN: 978-3-319-04960-1
eBook Packages: EngineeringEngineering (R0)