Double difference phase detection

Details Double difference phase detection Double difference phase detection

2008-04-01

2008-04-01

Qureshi, Afsar (Department: 2616)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Fourier transform

C370S208000, C370S480000, C375S260000, C375S362000, C455S078000, C714S793000

Reexamination Certificate

active

07352691

ABSTRACT:
A method that allows a digital communications system to detect the presence of transmitted messages in noisy environments. The system includes an OFDM transmitter and an OFDM receiver. The OFDM transmitter converts a digital signal to be transmitted to a plurality of sub-signals, each corresponding to a respective sub-carrier frequency. The signal is a packet including a preamble field having a known data pattern. The transmitter pre-codes the preamble data pattern, maps the data to corresponding phase information, converts the sub-signals to the time domain, and converts the sub-signals to analog form for subsequent transmission. The OFDM receiver receives the transmitted sub-signals, converts the sub-signals to digital form, converts the sub-signals to the frequency domain, and subjects the sub-signals to preamble detection processing to detect the signals' presence. By pre-coding the preamble data pattern and defining the received sub-signals in terms of the phase difference between adjacent sub-carriers, the detection of the transmitted messages can be performed in a manner that is insensitive to phase offset.

REFERENCES:
patent: 2003/0193970 (2003-10-01), Kim et al.
patent: 2005/0041622 (2005-02-01), Dubuc et al.
patent: 2006/0114981 (2006-06-01), Ghosh et al.

Affiliated with

Also associated with

Rating

Double difference phase detection does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Double difference phase detection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Double difference phase detection will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2766260