Sub-carrier allocation for OFDM

Details Sub-carrier allocation for OFDM Sub-carrier allocation for OFDM

2004-02-26

2009-02-03

Corrielus, Jean B (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S295000, C375S316000, C370S206000

Reexamination Certificate

active

07486735

ABSTRACT:
The present invention divides the available sub-carriers in an OFDM symbol window into N groups of sub-carriers wherein each group will be associated with sub-bands. In one embodiment, the sub-carriers in a group are spread throughout the range of sub-carriers to improve frequency diversity, and the sub-carriers assigned to any one group are separated by a constant offset. The sub-carriers in the group may be offset by an integer power of two. Within each group, sub-bands are defined using frequency hopping patterns among sub-carriers in the group from one OFDM symbol window to another. A pseudo-random pattern may be employed for sub-carrier mapping from one OFDM symbol window to the next to effectively distribute the sub-bands across the selected band of sub-carriers for the group.

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International Search Report for PCT/IB2004/000500, mailed Aug. 13, 2004.
Chen, Qingxin, Elvino S. Sousa, and Subbarayan Pasupathy, “Multicarrier CDMA with Adaptive Frequency Hopping for Mobile Radio Systems,” IEEE Journal on Selected Areas in Communications, vol. 14, No. 9, Dec. 1996.

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