Symbol timing recovery network for a carrierless amplitude phase

Details Symbol timing recovery network for a carrierless amplitude phase Symbol timing recovery network for a carrierless amplitude phase

1997-03-27

1999-11-16

Tse, Young T.

Pulse or digital communications

Receivers

Angle modulation

375332, 375344, 329304, H04L 2722

Patent

active

059870737

ABSTRACT:
A symbol timing recovery (STR) error detector includes a complex multiplier and a Gardner-type symbol timing error estimator for operation with carrierless amplitude phase (CAP) signals. Quadrature Ir and Qr signals from the system are input to the complex multiplier, which also receives signals from a numerically controlled oscillator operating at the CAP center frequency. The output of the complex multiplier is provided to the input of the Gardner STR error estimator. An added frequency shift allows the Gardner error estimator to function with CAP signals. The output from the error estimator is provided to a loop filter the output of which is provided to an oscillator which generates the symbol timing information for a symbol sampling network.

REFERENCES:
patent: 4253184 (1981-02-01), Gitlin et al.
patent: 4871975 (1989-10-01), Nawata et al.
patent: 5796786 (1998-08-01), Lee
patent: 5809069 (1998-09-01), Polley et al.
Floyd M. Gardner, A BPSK/QPSK Timing-Error Detector for Sampled Receivers, IEEE Transactions on Communications, vol. COM-34, No. 5, May 1986, pp. 423-429.
Floyd M. Gardner, Interpolation in Digital Modems--Part I: Fundamentals, IEEE Transactions on Communications, vol. 41, No. 3, Mar. 1993, pp. 501-507.
Lars Erup, Floyd M. Gardner, Robert A. Harris, Interpolation in Digital Modems--Part II: Implementation and Performance, IEEE Transactions on Communications, vol. 41, No. 6, Jun. 1993, pp. 998-1008.
Edward A. Lee et al., Digital Communication, Copyright .COPYRGT.1988 by Kluwer Academic Publishers, Section 15--Timing Recovery, pp. 561-586.

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