Method distinguishing line of sight (LOS) from non-line of...

Details Method distinguishing line of sight (LOS) from non-line of... Method distinguishing line of sight (LOS) from non-line of...

2006-08-29

2006-08-29

Maung, Nay (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Carrier and single sideband

C455S067160, C455S450000, C455S451000, C455S452100, C455S456100, C370S335000, C370S342000

Reexamination Certificate

active

07099640

ABSTRACT:
The invention discloses a method that identifies whether a channel is LOS or NLOS in a mobile communication system. After coherent accumulation and non-coherent accumulation have been made by the system, first the method takes power difference between the direct path and the non-direct path in a same power delay profile to identify a channel; and then the result is further determined by {overscore (τ)}/σ difference of a LOS channel and a NLOS channel (where {overscore (τ)} and σ is the mean delay and the RMS delay spread of a multipath power profile, respectively). A channel is determined as a LOS channel, if the power ratio of the Maximum Path to the Local Maximum Path is greater than a threshold K, and simultaneously the arrival time difference between the First Path and said Maximum Path is less than a time interval T; otherwise it is a NLOS channel. The method is easier to implement and compatible with the present mobile communication system.

REFERENCES:
patent: 5974329 (1999-10-01), Wylie et al.
patent: 6421334 (2002-07-01), Baines
patent: 2001/0014116 (2001-08-01), Saito et al.
patent: 2002/0132597 (2002-09-01), Peterzell et al.
patent: 1126626 (2001-02-01), None

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