Multiplex communications – Generalized orthogonal or special mathematical techniques – Quadrature carriers
Reexamination Certificate
2011-01-18
2011-01-18
Pham, Chi H. (Department: 2471)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Quadrature carriers
C370S208000, C370S210000, C370S503000, C375S260000, C375S355000
Reexamination Certificate
active
07872961
ABSTRACT:
A base station receives (201) OFDMA messages from a plurality of end user platforms that share all used tones within at least one OFDMA symbol. By one approach this base station then uses (202) a fixed starting time to select contiguous samples from received aggregate multi-user signals wherein the fixed starting time is offset from a reference time that comprises a time at which the base station expects to be receiving the signals from all end users. In combination with the time offset approach noted above or in lieu thereof the base station can process (204) selected contiguous samples using fast Fourier transform and then provide (205) phase rotation with respect to those processed samples. When applying phase rotation, by one approach a phase rotation can be applied (401) to the aggregate multi-user signal and, in addition, individual phase rotation can be applied (402) as determined on a user-by-user basis.
REFERENCES:
patent: 7149266 (2006-12-01), Imamura et al.
patent: 7269125 (2007-09-01), Smallcomb
patent: 2005/0135230 (2005-06-01), Yu et al.
patent: 2005/0169408 (2005-08-01), Kim
patent: 2006/0002359 (2006-01-01), Kim et al.
patent: 2006/0153227 (2006-07-01), Hwang et al.
patent: 2007/0041312 (2007-02-01), Kim
patent: 2007/0223602 (2007-09-01), Yu et al.
Chen Xiangyang
Wu Jian J.
Yu Xiaoyong
Hom Shick
Motorola Mobility, Inc.
Pham Chi H.
LandOfFree
Orthogonal frequency division multiple access message... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Orthogonal frequency division multiple access message..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Orthogonal frequency division multiple access message... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2711869