Demodulation apparatus for efficiently embodying adaptive...

Details Demodulation apparatus for efficiently embodying adaptive... Demodulation apparatus for efficiently embodying adaptive...

2004-11-03

2011-11-29

Mattis, Jason (Department: 2461)

Multiplex communications

Pathfinding or routing

Fdm switching

C375S219000

Reexamination Certificate

active

08068510

ABSTRACT:
Disclosed is a demodulation apparatus for receiving signals by an adaptive modulation and coding method, and demodulating the signals, in an OFDMA based packet communication system, comprising: a QAM demapper for performing QAM demapping to the received signals by a modulation method using a maximum modulation ratio, until modulation methods for each of sub-channels are analyzed; a slot buffer for storing the data outputted from the QAM demapper; a channel decoder for decoding the data stored in the slot buffer and analyzing modulation methods for each sub-channels and transferring the analyzed modulation methods to the QAM demapper; and in at the same time, reading valid data from the data stored in the slot buffer, based on the analyzed modulation methods for each sub-channels, and demodulating the valid data.

REFERENCES:
patent: 6226333 (2001-05-01), Spalink
patent: 2002/0087685 (2002-07-01), Lassen et al.
patent: 2002/0114379 (2002-08-01), Uesugi et al.
patent: 2002/0136207 (2002-09-01), Matsumoto et al.
patent: WO 02/078232 (2002-10-01), None

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