Method for determining the quality of a communication channel

Details Method for determining the quality of a communication channel Method for determining the quality of a communication channel

2006-09-19

2006-09-19

Fan, Chieh M. (Department: 2634)

Pulse or digital communications

Receivers

Interference or noise reduction

C375S285000, C327S310000, C327S384000, C327S551000, C455S296000

Reexamination Certificate

active

07110479

ABSTRACT:
In accordance with the present invention, there are provided methods for estimating the level of interferers and the level of a useful signal in a spectral window of a given bandwidth in a communications channel in a complex multipath propagation environment. The first method of estimating the level of interferers comprises generating and transmitting several sets of sine waves on the Nyquist frequency. Each set is characterized by a certain phase so that the sequence of phase values evenly spans the interval (0, 2π) radians. The second method comprises generating and transmitting several sets of sine waves of the same phase, with frequencies evenly spanning a vicinity of the Nyquist frequency. The method of estimating the level of a useful signal comprises transmitting several repetitions of the signal used for actual data transmission and processing it by the receiving station.

REFERENCES:
patent: 5581580 (1996-12-01), Lindbom et al.
patent: 5666429 (1997-09-01), Urbanski
patent: 6205410 (2001-03-01), Cai
patent: 6298242 (2001-10-01), Schiff
patent: 6442495 (2002-08-01), Fleming-Dahl
patent: 547174 (2004-02-01), Mitlin
P.J.Chang, A.Rofougaran, A.A.ABIDI: “A CMOS Channel-Select Filter for a Direct-Conversion Wireless Receiver” This paper was presented at the Symposium on VLSI Circuits, Honolulu, Jun. 13-15, 1996; pp. 62-63.

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