Patent ID: 8422572

Claim:
A method for single carrier frequency-division multiple access (SC-FDMA) data transmission, comprising: mapping a succession of input data (x(i), i=1, 2, 3 . . . , N) onto a first number (N) of first frequency channels (f( 1 ), f( 2 ), f( 3 ), . . . , f(N)) in a first frequency space, the input data (x(i) being mapped onto the first frequency channels to produce first transformed data signals (y(i)), i=1, 2, 3, . . . N); mapping the first transformed data signals (y(i)) onto a second number of second frequency channels (f( 1 )*, f( 2 )*, f( 3 )*, . . . f(N)*, . . . f(Nc)*) in a second frequency space, the second number (Nc) being greater than the first number (N), the first transformed data (y(i)) being mapped onto the second frequency channels to produce second transformed data signals; performing an inverse transformation on the second transformed data signals, the inverse transformation producing a sequence of data signals; and transmitting the sequence of data signals, wherein the first transformed data signals (y(i)) are mapped into a frequency domain (f(i+1)*, . . . , f(i+N)*) of the second frequency channels (f( 1 )*, f( 2 )*, f( 3 )*, . . . , f(N)*, . . . , f(Nc)*) such that a direct component (y( 1 ) for f( 1 )) of the first transformed data signals (y(i)) is mapped centrally within the frequency domain (f(i+1)*, . . . , f(i+N)*), wherein a first half of the first transformed data signals (y(i), i=1, 2, . . . , N/2) is mapped, including the direct component (y( 1 )), in the frequency domain (f(i+1)*, . . . , f(i+N)*) of the second frequency channels (f( 1 )*, f( 2 )*, f( 3 )*, . . . , f(N)*, . . . , f(Nc)*) following a second half of the first transformed data signals (y(i), i=N/2, . . . , N), the first half of the first transformed data signals (y(i), i=1, 2, . . . , N/2) is mapped, including the direct component (y( 1 )), onto first instances of the second frequency channels (f( 1 )*, f( 2 )*, . . . , f(N/2)*), and the second half of the transformed data signals (y(i), i=N/2, . . . , N) is mapped onto the last instances of the second frequency channels (f(N−½)*, . . . , f(Nc)*), and then a cyclic shift to the frequency domain (f(i+1)*, . . . , f(i+N)*) is performed.