Orthogonal complex spreading method for multichannel and apparatus thereof
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United States of America Patent
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Apr 24, 2001
Grant Date -
N/A
app pub date -
Sep 30, 1998
filing date -
Dec 2, 1997
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Abstract
An orthogonal complex spreading method for a multichannel and an apparatus thereof are disclosed. The method includes the steps of complex-summing .alpha..sub.n1 W.sub.M,n1 X.sub.n1 which is obtained by multiplying an orthogonal Hadamard sequence W.sub.M,n1 by a first data X.sub.n1 of a n-th block and .alpha..sub.n2 W.sub.M,n2 X.sub.n2 which is obtained by multiplying an orthogonal Hadamard sequence W.sub.M,n2 by a second data X.sub.n2 of a n-th block; complex-multiplying .alpha..sub.n1 W.sub.M,n1 X.sub.n1 +j.alpha..sub.n2 W.sub.M,n2 X.sub.n2 which is summed in the complex type and W.sub.M,n3 +jPW.sub.M,n4 of the complex type using a complex multiplier and outputting as an in-phase information and quadrature phase information; and summing only in-phase information outputted from a plurality of blocks and only quadrature phase information outputted therefrom and spreading the same using a spreading code.
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