STBC MIMO-OFDM peak-to-average power ratio reduction by...

Details STBC MIMO-OFDM peak-to-average power ratio reduction by... STBC MIMO-OFDM peak-to-average power ratio reduction by...

2004-12-16

2008-03-04

Patel, Ajit (Department: 2616)

Multiplex communications

Generalized orthogonal or special mathematical techniques

C370S334000, C375S347000, C375S267000, C455S101000

Reexamination Certificate

active

07339884

ABSTRACT:
A signal scrambling method is provided for peak-to-average power ratio (PAPR) reduction of STBC MIMO-OFDM signals in a MIMO-OFDM system having Y transmit antenna. In general terms the OFDM sequence of symbols in said signal for each transmit antenna is divided into M sub-blocks of equal size and subclockwise rotation and inversions are performed across all transmit antennas to generate [2Y]Mpermuted sequence sets from the original OFDM sequence. Based on a predetermined criteria, there is then selected from the resulting sets of OFDM sequences the one with the best PAPR properties for transmission. The predetermined criteria preferably comprises identifying maximums for all [2Y]Msequence sets, by calculating the largest PAPR value of Y sequences in each set and selecting a set with the minimum maximum for transmission.

REFERENCES:
patent: 2003/0076777 (2003-04-01), Stuber et al.
patent: 2006/0245346 (2006-11-01), Bar-Ness et al.
patent: 2006/0252386 (2006-11-01), Boer et al.
patent: 2007/0060073 (2007-03-01), Boer et al.
patent: 2007/0098109 (2007-05-01), Vadde et al.
patent: 2007/0217546 (2007-09-01), Sandell et al.
M. Tan and Y. Bar-Ness, “OFDM Peak-to-Average Power Ratio Reduction by Combined Symbol Rotation and Inversion with Limited Complexity,” Proc. of IEEE GLOBECOM 1993, Dec. 1993, pp. 605-610.

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