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PAPR reduction method using bit reallocation

  • US 7,313,195 B2
  • Filed: 02/09/2004
  • Issued: 12/25/2007
  • Est. Priority Date: 07/09/2003
  • Status: Active Grant
First Claim
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1. A PAPR (peak to average power ratio) reduction method using bit reallocation, applied in a multi-carrier system, a transmitter of the multi-carrier system transmitting D-bit data at N sub-carriers over a channel, the method comprising the steps of:

  • an initializing step, for initializing a bit loading algorithm to allocate di bits required at the i-th sub-carrier for data transmission, wherein 0≦

    i≦

    (N−

    1);

    a PAPR computing step, for computing the PAPR of the multi-carrier system in accordance with di bits transmitted at the i-th sub-carrier;

    a comparing step, for determining if the PAPR is larger than a predetermined value A, and if yes, terminating the PAPR reduction method; and

    an adjusting step, for performing an adjustment of increasing Δ

    d bits at a first selected sub-carrier and decreasing Δ

    d bits from a second selected sub-carrier, and then executing the PAPR computing step.

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