Dynamic sub-carrier assignment in OFDM systems

Details Dynamic sub-carrier assignment in OFDM systems Dynamic sub-carrier assignment in OFDM systems

2006-04-18

2006-04-18

Tran, CongVan (Department: 2688)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S452100, C370S208000

Reexamination Certificate

active

07031753

ABSTRACT:
A method and apparatus are provided for selecting and signalling the identity of sub-carriers to be used for transmission of data in a radio communication system, and for using other sub-carriers. A remote unit determines which sub-carriers are acceptable for use in data transmission by comparing the signal to interference ratio of each sub-carrier with a threshold. A sequence of numbers is generated using one set of values to identify acceptable sub-carriers and another set of values to identify unacceptable sub-carriers. The sequence of numbers is transmitted to a base station. The average signal to interference ratio of sub-carriers whose signal to interference ratio was above the threshold can also be transmitted to the base station, thereby allowing the base station to determine an optimum set of transmission parameters for use only in the acceptable sub-carriers. Alternatively, the remote unit can determine the optimum set of transmission parameters itself for transmission to the base station. As yet another alternative, the remote unit can determine an optimum Link Mode for each acceptable sub-carrier, and use a reference to the Link Modes as the set of values identifying acceptable sub-carriers. The base station transmits data over the acceptable sub-carriers at the optimum Link Mode or Link Modes. The base station may use some of the unacceptable sub-carriers for transmission of low sensitivity data at the optimum Link Mode, and may use some of the unacceptable sub-carriers for transmission of data at a lower Link Mode. The transmission power of any unused unacceptable sub-carriers can be diverted to other sub-carriers.

REFERENCES:
patent: 5504775 (1996-04-01), Chouly et al.
patent: 6791962 (2004-09-01), Wentink
patent: 6952454 (2005-10-01), Jalali et al.
patent: 2002/0176485 (2002-11-01), Hudson
patent: 2003/0012126 (2003-01-01), Sudo
patent: 2005/0070340 (2005-03-01), Kim

Affiliated with

Also associated with

Rating

Dynamic sub-carrier assignment in OFDM systems does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dynamic sub-carrier assignment in OFDM systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamic sub-carrier assignment in OFDM systems will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3618360