Synchronization method and apparatus for frequency division...

Details Synchronization method and apparatus for frequency division... Synchronization method and apparatus for frequency division...

2006-03-28

2006-03-28

Chin, Wellington (Department: 2664)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Fourier transform

C370S503000

Reexamination Certificate

active

07020074

ABSTRACT:
In a frequency division multiplexed (FDM) telecommunications system, data is encoded on carriers stepped in frequency within each of a sequence of symbols. The carriers may be arranged in groups between which there are frequency bands in which interference may be expected. The symbols are of predetermined length and are transmitted at a predetermined frequency, and synchronisation to the symbols is needed at a receiver in order to decode the received symbols. During a synchronisation time, a sequence of synchronisation symbols carrying predetermined data is transmitted. The receiver performs unsynchronised Fast Fourier Transforms (FFTs) on the received symbols, starting successive FFTs at about the predetermined symbol frequency. The output of each FFT is evaluated by removing the predetermined data coding from the detected carriers and summing the detected phase differences between the carriers. If the sum exceeds a predetermined threshold, synchronisation between the FFT and a symbol is declared and used to synchronise subsequent FFTs to subsequent symbols.

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