Patent ID: 7577160

Claim:
An OFDM (Orthogonal Frequency Division Multiplexing) transmitting apparatus, comprising: an interface which receives an input data sequence; and a processor connected with the interface, and maps the input data sequence into a transmission data sequence, and generates an OFDM symbol by using the transmission data sequence, wherein: the mapping comprises at least one of repetition, shift, reversal, shift-plus-reversal, and reversal-plus-shift; the shift comprises a circulative shift; and the circulative shift is performed with respect to the input data sequence a T [i] according to the equation: b[i]=a T [m ( i ) SN CBPS +mod( i+m ( i ) SN cyc ,N CBPS )], where m ( i )=* i/N CBPS +, i= 0 , . . . , N CBP6S −1, N CBPS is a number of coded bits per OFDM symbol, N cyc is a number of circulative shifts, and N CBP6S is a number of coded bits per 6 OFDM symbols.