US 6,982,946 B2
Partly orthogonal multiple code trees
Niclas Wiberg, Linköping (Sweden); Gunnar Bark, Linköping (Sweden); and Ke Wang Helmersson, Linköping (Sweden)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (Sweden)
Filed on Apr. 05, 2001, as Appl. No. 9/828,340.
Prior Publication US 2002/0172264 A1, Nov. 21, 2002
Int. Cl. H04J 11/00 (2006.01)
U.S. Cl. 370—208 38 Claims
OG exemplary drawing
 
1. An interference reduction method comprising the steps of:
a first generating step for generating a first scrambling code sequence;
a second generating step for generating a second scrambling code sequence based on a modification of the first scrambling code sequence;
a first forming step for forming a first code tree associated with the first scrambling code sequence;
a second forming step for forming a second code tree associated with the second scrambling code sequence;
a first spreading step for spreading a first signal using a first portion of the first code tree; and
a second spreading step for spreading a second signal using a second portion of the second code tree, the second portion of the second code tree being orthogonal to the first portion of the first code tree.