Link adaptation process

Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part

Reexamination Certificate

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C455S039000, C455S456100, C370S332000, C370S469000

Reexamination Certificate

active

10740431

ABSTRACT:
The link adaptation process for selecting a physical layer mode used on a radio link for transmitting symbols of a message between two stations of a wireless communication system among a set of potential physical layer modes comprises the steps of: —evaluating the current radio link conditions; and switching from a current physical layer mode to another physical layer mode by applying a criteria depending on the evaluated current radio link conditions. The evaluation step of the current radio link conditions comprises the calculation of a received modulation accuracy (RMA) for at least a part of the message, the received modulation accuracy (RMA) being de\-fined as the inverse of the expectation of a quadratic error for a predetermined number of symbols between demodulated received symbol values and ideal symbol values and in that the criteria is at least partially dependent on the calculated received modulation accuracy (RMA).

REFERENCES:
patent: 2005/0175071 (2005-08-01), Hofmmann et al.
patent: 1 176 750 (2002-01-01), None
patent: 2 742 613 (1997-06-01), None
patent: WO 02/33875 (2002-04-01), None
K. Balachandran, et al., IEEE Journal on Selected Areas in Communications, vol. 17, No. 7, XP-000834946, pp. 1244-1256, “Channel Quality Estimation and Rate Adaptation for Cellular Mobile Radio”, Jul. 1999.
M. Lampe, et al., OFDM Workshop 2002, ′Online!, www.comnets.rwth—aachen.de/{cover/publications/InOWo—September—2002—TUHH.pdf, XP-002237207, 5 pages, “Per-Prediction for Link Adaptation in OFDM Systems”, Sep. 10, 2002.

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