Patent ID: 7345990

Claim:
An OFDM (Orthogonal Frequency Division Multiplexing) transmitter, comprising: an (n, k) linear block encoder for outputting an n-bit codeword c=(c 0 , c 1 , . . . , c n-1 ) when a k-bit information block d=(d 0 , d 1 , . . . , d k-1 ) is inputted wherein n is an integer greater than or equal to 1 and k is an integer less than or equal to n; U number of adders for generating signals a 1 , a 2 , . . . , a U by performing bit-wise modulo-2 addition of a set of coset leaders e 1 , e 2 , . . . , e U and the codeword c, the coset leaders associated with different syndromes being selected in relation to a parity-check matrix H for an (n, k) code; U number of m-ary signal mappers each mapping an output of a respective adder to a signal symbol in a unit of m bits and then generating a discrete signal x i consisting of N number of symbols, wherein m is an integer greater than or equal to 2, i=1 to U, and N is set such that n=mN is satisfied; U number of LN-point IDFT (Inverse Discrete Fourier transform) circuits each transforming the discrete signal x i from a respective m-ary signal mapper into a discrete signal y i consisting of LN number of samples in a time domain, L being an oversampling factor, wherein L is an integer greater than or equal to 1; and a peak detector for searching for a signal y j having a smallest maximum value among the LN number of samples to detect a signal having minimum peak power among U number of discrete signals y 1 , y 2 , . . . , y U from the LN-point IDFT circuits.