Joint low-complexity blind equalization, carrier recovery, and timing recovery with application to cable modem transmission

SUMMARY We present a receiver structure with joint blind equalization, carrier recovery, and timing recovery. The blind equalizer employs a decomposition transversal ltering technique which can reduce the complexity of convolution to about a half. We analyze the performance surface of the equalizer cost function and show that the global minima correspond to perfect equalization. We also derive proper initial tap settings of the equalizer for convergence to the global minima. We describe the timing recovery and the carrier recovery methods employed. And we describe a startup sequence to bring the receiver into full operation. The adaptation algorithms for equalization, carrier recovery, and timing recovery are relatively independent, resulting in good operational stability of the overall receiver. Some simulation results for cable-modem type of transmission are presented.

[1]  Kenneth R. Laker,et al.  Sign algorithms for blind equalization and their convergence analysis , 1991 .

[2]  D. Godard,et al.  Self-Recovering Equalization and Carrier Tracking in Two-Dimensional Data Communication Systems , 1980, IEEE Trans. Commun..

[3]  Y. Sato,et al.  A Method of Self-Recovering Equalization for Multilevel Amplitude-Modulation Systems , 1975, IEEE Trans. Commun..

[4]  Zhi Ding,et al.  On the whereabouts of local minima for blind adaptive equalizers , 1992 .

[5]  Yung-An Kao,et al.  A new efficient LMS adaptive filtering algorithm , 1994, Proceedings of TENCON'94 - 1994 IEEE Region 10's 9th Annual International Conference on: 'Frontiers of Computer Technology'.

[6]  Neil K. Jablon,et al.  Joint blind equalization, carrier recovery and timing recovery for high-order QAM signal constellations , 1992, IEEE Trans. Signal Process..

[7]  Kenneth R. Laker,et al.  A simple hard-limited adaptive algorithm for blind equalization , 1992 .

[8]  Giancarlo Prati,et al.  Blind Equalization and Carrier Recovery Using a "Stop-and-Go" Decision-Directed Algorithm , 1987, IEEE Trans. Commun..

[9]  Eweda Eweda,et al.  Convergence analysis of self-adaptive equalizers , 1984, IEEE Trans. Inf. Theory.

[10]  A. Benveniste,et al.  Robust identification of a nonminimum phase system: Blind adjustment of a linear equalizer in data communications , 1980 .

[11]  Saleem A. Kassam,et al.  Dual-mode type algorithms for blind equalization , 1994, IEEE Trans. Commun..

[12]  A. Benveniste,et al.  Blind Equalizers , 1984, IEEE Trans. Commun..

[13]  D. W. Lin,et al.  An efficient FSE/DFE-based HDSL equalizer with new adaptive algorithms , 1994, Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications.