Carrier allocation method in OFDM system and transmitting...

Details Carrier allocation method in OFDM system and transmitting... Carrier allocation method in OFDM system and transmitting...

2005-05-11

2010-10-12

Kim, Kevin Y (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C370S208000

Reexamination Certificate

active

07813435

ABSTRACT:
The present invention relates to a method for allocating subcarriers in an orthogonal frequency division multiplex (OFDM) system, and a transmitter thereof. In the OFDM system according to an exemplary embodiment of the present invention, the subcarrier allocation is performed in the buffer (10) before a modulation mapping operation is performed according to a modulation method such that the delay may not be generated in the subchannel formed on the symbol axis. The delay corresponding to the symbols is prevented without using any additional hardware for eliminating the delay generated when the subcarriers are allocated to the subchannel formed on the symbol axis.

REFERENCES:
patent: 2006/0008014 (2006-01-01), Tamaki et al.
patent: 1020030070218 (2003-08-01), None
patent: 2004077777 (2004-09-01), None
A Real-time Sub-carrier Allocation Scheme for Multiple Access Downlink OFDM Transmission—Cheong Yui Wong, et al.,, pp. 1124-1129, IEEE, 1999.
“Multiuser subcarrier allocation for OFDM transmission using adaptive modulation”—Cheong Yui Wong, et al., pp. 479-483, May 16-20, 1999, IEEE 49th Houston Veh. Tech. Conf.
“Multiuser subcarrier allocation for QoS provision in the OFDMA systems”—Pietrzyk, S., et al, IEEE 56th, Veh. Tech. conf. Sep. 2002, pp. 1077-1081.

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