Channel adaptation using variable sounding signal rates

Details Channel adaptation using variable sounding signal rates Channel adaptation using variable sounding signal rates

2007-10-09

2007-10-09

Phu, Sanh D. (Department: 2618)

Telecommunications

Transmitter and receiver at separate stations

Having measuring, testing, or monitoring of system or part

C455S452200, C370S235000

Reexamination Certificate

active

10769414

ABSTRACT:
Systems, devices and methods for updating link adaptations in multi-carrier modulated signals between an access point (AP) and a wireless local area network (WLAN) station (STA) include (are configured for) periodically transmitting a channel sounding signal from the AP. The STA receives each unsolicited channel sounding signal and evaluates the current channel conditions between the AP and STA. The AP adjusts a rate of transmission of the channel sounding signals in accordance with the channel coherence time so that the channel estimates performed by the STA will be valid within the time varying characteristics of the channel. Depending on the length of the coherence time for network environment, the channel sounding signals may be AP beacons, low overhead signal fragments with no payload, or a combination of both.

REFERENCES:
patent: 6697640 (2004-02-01), Katz et al.
patent: 2003/0086371 (2003-05-01), Walton et al.
patent: 2003/0123559 (2003-07-01), Classon et al.
patent: 101 41 971 (2003-03-01), None
L. Hanzo et al., “OFDM and MC-CDMA for Broadband Multi-User Communications, WLANs and Broadcasting”, Jan. 1, 2003, pp. 164-165 and 196-198.

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