Patent ID: RE40385

Claim:
An orthogonal complex spreading method for multiple channels, comprising the steps of: complex-summing W M,n1 X n1 , which is obtained by multiplying an orthogonal code sequence W M,n1 by first data group X n1 of a n-th block, and W M,n2 X n2 , which is obtained by multiplying an orthogonal code sequence W M,n2 by second data group X n2 of a n-th block, M and n being positive integers; complex-multiplying the complex summed form of W M,n1 X n1 +jW M,n2 X n2 , by a complex form of W M,n3 +jW M,n4 and outputting (W M,n1 X n1 +jW M,n2 X n2 )×(W M,n3 +jW M,n4 ) as an output signal; and summing in-phase and quadrature phase parts of the output signal outputted from a plurality of blocks as ( ∑ n = 1 K ⁢ ⁢ ( ( W M , n1 ⁢ X n1 + jW M , n2 ⁢ X n2 ) × ( W M , n3 + j ⁢ ⁢ W M , n4 ) ) ) , K is a predetermined integer greater than or equal to 1 to generate I channel and Q channel signal.