Method of initial frame synchronization using orthogonal frequen

Details Method of initial frame synchronization using orthogonal frequen Method of initial frame synchronization using orthogonal frequen

1997-03-13

1999-06-22

Hofsass, Jeffrey A.

Multiplex communications

Generalized orthogonal or special mathematical techniques

370208, 370350, H04J 105

Patent

active

059149310

ABSTRACT:
An initial frame synchronization method for finding out the initial frame synchronization offset at a receiver using the orthogonal frequency division multiplexing signals by which any data is given and received in a frame unit, and by the estimation method of the phase difference variation and the maximum likelihood in the frequency domain. According to the invention, the initial frame synchronization is realized simply and rapidly by sending for initialization from the transmitter two frames consisting of the bit streams known already in the bit stream preamble, taking at the receiver only one among two frames to find out the synchronization offset value by any phase change, introducing a parameter corresponding to the variation of the phase difference without using merely the phase difference between the reference signal coordinates and the received signal coordinates, making a new parameter by adding the number of the subchannels used in a frame to such parameter, obtaining a conditional probability density function for the parameter by applying the probability theory and the approximation formula, and finally obtaining the initial synchronization offset value by the maximum likelihood estimation.

REFERENCES:
patent: 5444697 (1995-08-01), Leung
patent: 5652772 (1997-07-01), Isaksson

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