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Apparatus and method for transmitting a preamble and searching a cell in an OFDMA system

  • US 20060098752A1
  • Filed: 11/09/2005
  • Published: 05/11/2006
  • Est. Priority Date: 11/11/2004
  • Status: Abandoned Application
First Claim
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1. A method for transmitting a preamble in an orthogonal frequency division multiple access (OFDMA) system using N subcarriers, the method comprising the steps of:

  • generating an allocated pseudo-random noise (PN) code of PCODE PN codes from each cell such that all NCODE cells are identified, where PCODE is less than NCODE;

    transforming the PN code into N orthogonal frequency division multiplexing (OFDM) samples according to N-point inverse fast Fourier transform (IFFT);

    cyclically shifting the OFDM samples by an allocated value of QCODE cyclic shift values, where NCODE is PCODE*QCODE;

    inserting a cyclic prefix (CP) for preventing inter-symbol interference into a head end of the cyclically shifted OFDM samples, and generating a first OFDM symbol to be used for a preamble; and

    transmitting the first OFDM symbol at a beginning of a data frame through a radio frequency (RF) band.

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