Transmission system for OFDM-signals with optimized synchronization

Receiving method for receiving OFDM-signals comprising M identical or respectively mirrored wave forms within one OFDM-timeburst, wherein M is an integer and M≧2, comprising the steps of

• receiving said OFDM-signals,
• correlating said waveforms to obtain time synchronization using M−1 correlators,
• transforming said signals into the frequency domain, and
• demodulating said signals.

Receiving apparatus for receiving OFDM-signals comprising M identical or respectively mirrored wave forms within one OFDM-timeburst, wherein M is an integer and M≧2, comprising:

• receiving means for receiving said OFDM-signals,
• correlating means (28, 29, 30, 31) correlating said waveforms to obtain time synchronization, wherein said correlation means includes M−1 correlators,
• synchronization, transformation means for transforming said signals into the frequency domain, and
• demodulating said signals.

A method for generating synchronization signals to be transmitted to a receiver device in an wireless communication system, the method comprising:

• obtaining a frequency domain sequence by modulating synchronization signals onto every 4th subcarrier of a plurality of available subcarriers used in the wireless communication system;
• generating a time domain sequence by performing inverse discrete Fourier transformation on the frequency domain sequence to generate a time domain sequence, wherein the time domain sequence contains 4 identical waveforms;
• and
• generating the synchronization signals to be transmitted from the time domain sequence.

A transmission apparatus configured to transmit signals, the transmission apparatus comprising:

• circuitry configured to
• modulate the signals onto a first plurality of subcarriers using a modulation method, wherein every 4th subcarrier of a second plurality of subcarriers corresponds to the first plurality of subcarriers;
• transform the first plurality of modulated subcarriers into the time domain by performing inverse discrete Fourier transform;
• and
• transmit the time domain transformed modulated subcarriers.