Apparatus and method for PAPR reduction in an OFDM communication system
First Claim
1. A method of generating an impulsive wave in an orthogonal frequency division multiplexing (OFDM) communication system where L subcarriers are allocated to reserved tone locations among N subcarriers and data is carried on (N-L) subcarriers, L being less than N, comprising the steps of:
- generating a predetermined number of random sets each having L tone locations;
allocating subcarriers to the L tone locations of each of the random sets without overlapping;
IFFT (Inverse Fast Fourier Transform)-processing the allocated subcarriers and storing a secondary peak value of the IFFT signal; and
detecting tone location information having a lower secondary peak value than the stored secondary peak value by fixing (L-1) tone locations and substituting subcarriers other than the subcarriers at the (L-1) tone locations for the remaining one tone location and storing the detected tone location information.
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Accused Products
Abstract
A method and apparatus for generating an impulsive wave in an OFDM communication system where L subcarriers are allocated to reserved tone locations among N subcarriers and data is carried on (N-L) subcarriers (L is less than N). In the method, a predetermined number of random sets each having L tone locations are created. Subcarriers are allocated to the L tone locations of each of the random sets without overlapping and IFFT-processed. A secondary peak value of the IFFT signal is stored. Tone location information having a lower secondary peak value than the stored secondary peak value is detected by fixing (L-1) tone locations and substituting subcarriers other than the subcarriers at the (L-1) tone locations one by one for the remaining one tone location. The tone location information is stored.
64 Citations
9 Claims
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1. A method of generating an impulsive wave in an orthogonal frequency division multiplexing (OFDM) communication system where L subcarriers are allocated to reserved tone locations among N subcarriers and data is carried on (N-L) subcarriers, L being less than N, comprising the steps of:
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generating a predetermined number of random sets each having L tone locations;
allocating subcarriers to the L tone locations of each of the random sets without overlapping;
IFFT (Inverse Fast Fourier Transform)-processing the allocated subcarriers and storing a secondary peak value of the IFFT signal; and
detecting tone location information having a lower secondary peak value than the stored secondary peak value by fixing (L-1) tone locations and substituting subcarriers other than the subcarriers at the (L-1) tone locations for the remaining one tone location and storing the detected tone location information. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for generating an impulsive wave in an orthogonal frequency division multiplexing (OFDM) communication system where L subcarriers are allocated to reserved tone locations among N subcarriers and data is carried on (N-L) subcarriers, L being less than N, comprising:
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a tone information controller for generating a predetermined number of random sets each having L tone locations;
a tone allocator for allocating subcarriers to the L tone locations of each of the random sets without overlapping;
an IFFT (Inverse Fast Fourier Transform)-processor for processing the allocated subcarriers and storing a secondary peak value of the IFFT signal; and
a tone location selector and inserter for detecting and inserting tone location information having a lower secondary peak value than the stored secondary peak value by fixing (L-1) tone locations and substituting subcarriers other than the subcarriers at the (L-1) tone locations one by one for the remaining one tone location and storing the detected tone location information. - View Dependent Claims (7, 8, 9)
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Specification