Iterative assessment of multipath signal presence

Details Iterative assessment of multipath signal presence Iterative assessment of multipath signal presence

2007-01-30

2007-01-30

Tse, Young T. (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C370S208000

Reexamination Certificate

active

10291154

ABSTRACT:
Method and system for determining whether one or more multipath signals is present in a received signal frame that includes a reference symbol (RS) sequence RS(t;m1) as part of the frame, and for iteratively evaluating a multipath signal that is present. The RS sequence index (m1) for the frame is identified, and first and second Fourier transforms Φ(f;m1;ref) and Φ(f;rec) for the received frame are provided for a selected time segment IS that includes the RS sequence of the received frame. An inverse Fourier transform σ(t;m1) of the ratio of the transforms is computed and analyzed. If at least one multipath signal is present, σ(t;m1) is nonlinearly filtered, and the filtered function is convolved with RS(t;m1). This convolution represents a received signal extension, due to multipath signal(s) presence. A refinement procedure analyzes a contribution to multipath signals from the preceding frame(s). The procedure is iteratively driven toward an optimal representation of any multipath signal(s) present.

REFERENCES:
patent: 6563885 (2003-05-01), Magee et al.
patent: 6801580 (2004-10-01), Kadous
patent: 7023931 (2006-04-01), Magee et al.
patent: 2002/0042661 (2002-04-01), Kim

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