Method for allocating subchannels in an OFDMA mobile...

Details Method for allocating subchannels in an OFDMA mobile... Method for allocating subchannels in an OFDMA mobile...

2004-11-24

2008-08-12

Gary, Erika A (Department: 2617)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S464000, C370S465000, C370S329000

Reexamination Certificate

active

07411924

ABSTRACT:
An adaptive modulation scheme relating to an RA problem for maximizing the transmission rates of all users for maximum transmission rates in an OFDMA system including some users requiring to use services at fixed data rates. The scheme proposes introduction of an adaptive modulation using linear programming into an existing scheme for a system including a single kind of users, thereby enabling simultaneous execution of the adaptive modulation for all users in a system including two kinds of users. Further, the invention proposes another scheme of sequentially allocating subchannels to the users when the fixed transmission rate has a sufficiently small value, in order to reduce the complexity.

REFERENCES:
patent: 5506844 (1996-04-01), Rao
patent: 5956674 (1999-09-01), Smyth et al.
patent: 6005893 (1999-12-01), Hyll
patent: 2001/0040880 (2001-11-01), Chen et al.
patent: 2004/0223511 (2004-11-01), Tzannes

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