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Method and apparatus for high-order PAPR reduction of an OFDM signal

  • US 20050286648A1
  • Filed: 08/24/2004
  • Published: 12/29/2005
  • Est. Priority Date: 06/28/2004
  • Status: Active Grant
First Claim
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1. A method for high-order peak-to-average power ration (PAPR) reduction for an OFDM signal, comprising:

  • (a) transforming a frequency domain signal X[k] of length N by an N-IFFT into a time domain signal x[n] of length N, where N is the number of useful data in an OFDM symbol, n=0, 1, . . . , N−

    1;

    (b) partitioning said sequence x[n] of length N into M disjoint subblocks, M being a power of 2 and greater or equal to 8, and N/M being an integer greater than 1;

    (c) transforming said subblocks into sub-sequences z[n], each having the length N/M, l=1, 2, . . . , M and n=0, 1, . . . , (N/M)−

    1; and

    (d) each said sub-sequence zl [n] being processed using complex multiplication followed by phase rotation or directly using phase rotation, then addition to form a complete N-point transmitted signal {tilde over (x)}[n].

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