Speed-based, hybrid parametric/non-parametric equalization

Details Speed-based, hybrid parametric/non-parametric equalization Speed-based, hybrid parametric/non-parametric equalization

2008-04-22

2011-10-18

Hannon, Christian (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S238100, C375S148000

Reexamination Certificate

active

08041325

ABSTRACT:
A mobile receiver having a multi-mode interference suppression function and a way to estimate its speed utilizes a parametric approach to interference suppression at high speeds, and a nonparametric approach at low speeds. In particular, if the mobile receiver is currently operating in a nonparametric mode and its speed exceeds a first predetermined threshold, the mobile receiver switches to a parametric mode. Conversely, if the mobile receiver is currently in parametric mode and its speed is less than a second predetermined threshold, the mobile receiver switches to nonparametric mode. In one embodiment, the speed may be estimated by a Doppler frequency in the received signal, and the thresholds are Doppler frequencies. In one embodiment, the first and second thresholds are different, creating a hysteresis in the mode switching.

REFERENCES:
patent: 2005/0201447 (2005-09-01), Cairns et al.
patent: 2005/0215218 (2005-09-01), Bottomley et al.
patent: 2006/0268962 (2006-11-01), Cairns et al.
patent: 2008/0089395 (2008-04-01), Cairns
Johansson H et al., Robust Multiuser Detection in Unknown Noise Channels, Globecom '02. 2002—IEEE Global Telecommunications Conference. Conference Proceedings. Taipei, Taiwan, Nov. 11-17, 2002, New York, NY: IEEE, US, vol. 2, Nov. 17, 2002, pp. 1078-1082.
Kutz, G. et al. “Sparse Chip Equalizer for DS-CDMA Downlink Receivers.” IEEE Communications Letters, vol. 9., No. 1, Jan. 2005, pp. 10-12.
Co-pending U.S. Appl. No. 60/942,921, filed Jun. 8, 2007.

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